/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| | | |
| | | |
| | | |
| +-----+-----+ +-----------+ |
| | | | Request connection | | | |
UCLA { | | | -> over link 25 | | | } SRI
| | +-+-+ | +-+ +-+ | +-+-+ | |
| | | OS|---+-=|I|----------|I|=-+---| OS| | |
| | +-+-+ | +-+ +-+ | +---+ | |
| | | | | |
| | | | | |
| +-----------+ +-----------+ |
| HOST: UCLA HOST: SRI |
\ /
/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| | | |
| | | |
| | | |
| +-----+-----+ "Please send front"+-----------+ |
| | | | end control" | | | |
UCLA { | | | -> | | | } SRI ___
| | +-+-+ | +-+ +-+ | +--+---+ | | / |
| | | OS|---+-=|I|----------|I|=-+--|OS|NLS| +----+---| |
| | +-+-+ | +-+ +-+ | +------+ | | |___/
| | | DEL prog. | | | | |
| | | <- | | | |____|
| +-----------+ +-----------+ |
| HOST: UCLA HOST:SRI |
\ /
/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| |Trivial | |
| |Responses | |
| | | |
| +-----+------+ +-----------+ |
| | | | | | | |
UCLA { | | | Major Responses | | | } SRI ___
| | +--+--+ | +-+ +-+ | +--+---+ | | / |
| | |DEL |---+-=|I|----------|I|=-+--|OS|NLS| +---+---| |
| | |front| | +-+ +-+ | +------+ | | |___/
| | | end | | | | | | |
| | |prog.| | | | | |____|
| | +-----+ | | | |
| | | OS | | | | |
| | +-----+ | | | |
| | | | | |
| +------------+ +-----------+ |
| HOST: UCLA HOST: SRI |
\ /
+---------+---------+---------+---------+
| FIELD 4 | FIELD 3 | FIELD 2 | FIELD 1 |
+---------+---------+---------+---------+
+---------+---------+---------+---------+
| FIELD 8 | FIELD 7 | FIELD 6 | FIELD 5 |
+---------+---------+---------+---------+
ADD
+-+---------+---------+---------+---------+
| | | | | |
+-+---------+---------+---------+---------+
| | | | |
| | | | v
| | | | +---------+
| | | | | |
| | | | +---------+
| | | |
| | | \ +---------+
| | | `-> | |
| | | +---------+
| | |
| | \ +---------+
| | `-----------> | |
| | +---------+
| |
| \ +---------+
| `--------------------->| |
| +---------+
|
\ +---+
`-----CARRY------------------------>| |
+---+
ADD
+---------+---------+
| | |
+--CARRY--+---------+
|
\ +-----+
ADD `-----> | |
+-----+
+- -+
|8080 (max host message length) - 32 (heading + marking)|
|-------------------------------------------------------|
| 8 (byte = 8 bits) |
+- -+
HOST (Sigma 7) <--|/|--> Outside world
Users |/|
| |/|
| |/| Special Standard
V |/| | |
+--------------+ +------------+ |/| V | V
o----| | | | |/| +------+------+
| Output |-->| Output |-->|/|-->| | |-->IMP
. . .| | | | |/| | |
| | | | |/| | | |
o----| (Multiplex) | | | |/| | |
|_ _ _ _ _ _ _ | |_ _ _ _ _ _ | |/| | _ _ _| _ _ _|
o----| | | | |/| | | |
| Input |<--| Input |<--|/|<--| |<--IMP
. . .| | | | |/| | | |
| | | | |/| | |
o----|(Distribution)| | | |/| +------|------+
| | | | |/| HARDWARE
+--------------+ +------------+ |/| Interface
NETWORK HANDLER |/|
Program Program |/|
|/| (Fig. 1)
+------------------+
| | | |
| | | interface |
| | | |
| |
| ====> Data |
| |
| ----- Logical |
| information|
+------------------+
+ - - - - - - - - - - - - - -+
| |
interface table
| +----------+ | | |
| | +---->| |<----+ | |
| | | | +----------+ | | interrupt | |
| | ^ | | +----<-------| |
| | | | +- -+ | | | | |
| | | V | _________ | V V V | |
o----| |-+ +---------+-+ | | || +-+--+--+---+ | |
| | \ |+---------+| | |_________|| |+---------+| | |
| | \|| || | | || || | |
| | +| || | - - - - - -| || || | |
| | || || | | || || | |
- - - - - -|| NETWORK ||=>- _________ -=>|| HANDLER ||=======>| |
| | +| Progr. || | | || || Progr. || | |
| | /|| || | |_________|| || || | |
| | / |+---------+| | | |+---------+| | |
o----| |-+ +-----------+ | _________ | +----+------+ | |
^ | | | | || | | |
| | | | |_________|| +--->---------->| |
| ^ +- ^ -+ Commands | |
Users | | | |
| Pool of buffers | |
User's ^
Interface |
Hardware
Interface
HOST(x) Prim. Link #12 HOST(y)
---------------------------->
! S I G N - I N : X X
HOST(x) Prim. Link #15 HOST(y)
<--------------------------
! ! R E A D Y
HOST(x) Prim. Link #12 HOST(y)
---------------------------->
! U R S A
HOST(x) Control link HOST(y)
------------------------------>
ENQ AUX 0 2 5
HOST(x) Control link HOST(y)
<--------------------------------
ACK ENQ AUX 0 2 5 0 2 1
HOST(x) Aux. Link #25 HOST(y)
-------------------------------->
X X ..... X X
HOST(x) Aux. Link #21 HOST(y)
<--------------------------------
X ......... X
|<---32 bits--->|<---32 bits--->|<----16 bits---->|<------?------>|
+---------------+---------------+-----------------+---------------+
| leader | marking | checksum | padding |
+---------------+---------------+-----------------+---------------+
Teletype
Terminal ______ ________
_________ | | ______ ______ | |
| | | USER | | | | | |SERVING |
| |-----| HOST |----| |---//---| |---| HOST |
|_________| | A | | | | | | B |
|______| |______| |______| |________|
University Stanford
of Utah Research
Institute
|----------------------------------------------------------------------|
B \ b7 ------------>| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
I \ b6 ---------->| 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
T \ b5 -------->| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
S |-----------------------------------------------|
COLUMN->| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|b4 |b3 |b2 |b1 | ROW | | | | | | | | |
+----------------------+-----------------------------------------------+
| 0 | 0 | 0 | 0 | 0 | NUL | DLE | SP | 0 | @ | P | ` | p |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 0 | 1 | 1 | SOH | DC1 | ! | 1 | A | Q | a | q |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 1 | 0 | 2 | STX | DC2 | " | 2 | B | R | b | r |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 1 | 1 | 3 | ETX | DC3 | # | 3 | C | S | c | s |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 0 | 0 | 4 | EOT | DC4 | $ | 4 | D | T | d | t |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 0 | 1 | 5 | ENQ | NAK | % | 5 | E | U | e | u |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 1 | 0 | 6 | ACK | SYN | & | 6 | F | V | f | v |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 1 | 1 | 7 | BEL | ETB | ' | 7 | G | W | g | w |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 0 | 0 | 8 | BS | CAN | ( | 8 | H | X | h | x |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 0 | 1 | 9 | HT | EM | ) | 9 | I | Y | i | y |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 1 | 0 | 10 | LF | SUB | * | : | J | Z | j | z |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 1 | 1 | 11 | VT | ESC | + | ; | K | [ | k | { |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 0 | 0 | 12 | FF | FS | , | < | L | \ | l | | |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 0 | 1 | 13 | CR | GS | - | = | M | ] | m | } |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 1 | 0 | 14 | SO | RS | . | > | N | ^ | n | ~ |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 1 | 1 | 15 | SI | US | / | ? | O | _ | o | DEL |
+----------------------+-----------------------------------------------+
<-------------32 bits --------------->
| HEADER |
|____________________________________|
| | | | |
| mark | l | <L1> | <L2> |
|______|_______|___________|_________|
| | |
| checksum | Padding |
|_________________|__________________|
typical control message (please
establish auxiliary link #L2
parallel to our primary link #l)
0 3 4 7 8 9 10 14 LINK# 24 31
_______________________________________________________________
| | | | | |////////////////|
| FLAGS | TYPE | H | SITE | 00000001 |////////////////|
|_______|______|_____|_______|_______________|________________|
Figure 1 Initial network configuration |<------------ 24bits ----------->|
| |
+---------------------------------+
| |
| Leader (32 bits) |
| __________________|
| | 100 --- ----0 |<----16 bits of marking
+--------------+------------------+
| |
| |
| Text of messages (96 bits) |
| |
+------------------------+--------+
| 100----- ----0|
+-------^----------------+
|
|______16 bits of padding added
by the interface
24 8 8
+----------------------+-----------+----------+
| User Number | | |
+----------------------+-----------+----------+
| |___AEN
|
|___HOST number
Figure 3 A typical socket
|<--- connection --->|
+---------+ +---------+
| | link | |
| process |--(|--------------|)--| process |
| | ^ ^ | |
+---------+ | | +---------+
| |
send socket receive socket
Socket Port
| | | ____________
| V V / \
V / \
|=| /==| |
-------(+)->|Y|-->< | |
|=| \==| |
| PROCESS |
| |
|=| /==| |
-------(-)->|X|<--< | |
|=| \==| |
\ /
\____________/
H O S T A H O S T C
______________________________ ______________________
| | | |
| ____ ____ ____ ____ | | ____ ____ ____ |
| |Proc| |Proc| |Proc| | | | | |Proc| |Proc| | | |
| | A | | B | | C | |UCC | | | | D | | E | |UCC | |
| |____| |____| |____| |____| | | |____| |____| |____| |
| | | | | | | | | | |
- - - - - - |- - - |- - - |- - -|- - -|- - |- - -|- - - |- - - - - -
| | | | | NCP NETWORK | | | |
| | | | | | | | | | |
| _|_____|______|______|_ | | _|_____|______|_ |
| | | | | | | |
| | N C P A | | | | N C P C | |
| |_______________________| | | |________________| |
| || | | || |
|_____________________||_______| |_______||_____________|
|| ||
- - - - - - - - - - - -|| - - - - - - - - - - ||- - - - - - - - - -
|| IMP NETWORK ||
___||___ ____||__
| | | |
| IMP |------------| IMP |
| A | | C |
|________| |________|
| |
| ________ |
| | | |
+------| IMP |-----+
| B |
|________|
HOST A | HOST B
INITIATOR | ACCEPTOR
PROCESS 'a' | PROCESS 'b'
|
|
| a. LISTEN 'socket code 9'
|
|
b. INIT 'socket code 12' 'Bb9' |
RFC 'AA12' 'Bb9' 'link 47' ==========>
|
| c. ACCEPT 'socket code 9'
| RFC 'Bb9' 'Aa12'
|
| d. TRANSMIT 'send buffer' 'len'
| 'socket 9'
<============== IMP message 'link 47' 'send buffer'
|
e. TRANSMIT 'rec buffer' 'length'
'socket 12' ============>
|
| f. CLOSE 'socket code 9'
|
last RFNM ===>
<============== CLS 'Bb9' 'Aa12'
closes socket 'Aa12' |
|
+---------+
| I M P |
+---------+
v ^
| |
+---------------------------|-----|------------------------------+
| | | |
| /\/\/\/\/\/\/\ | | /\/\/\/\/\/\/\ |
| \ / <--------+ +---< \ / |
| / Input \ / Output \ |
| \ Handler / \ Handler / <----+ |
| / \ >------+ / \ | |
| \/\/\/\/\/\/\/ | \/\/\/\/\/\/\/ ^ |
| v +-----+ |
| +-----+ | OH | |
| | IM | | Buf | |
| | Buf | +-----+ |
| +-----+ /\/\/\/\/\/\/\/\ ^ |
| /\/\/\/\/\/\/\/\ v +----> \ / | |
| \ / | | / Output \ >--+ |
| / \ <------+ ^ \ / |
| \ Input / /-----\ / Scheduler \ |
| / \ >-------->| HIQ | \ / |
| \ Interpreter / |_____| / \ |
| / \ >----+ \_____/ \/\/\/\/\/\/\/\/ |
| \/\/\/\/\/\/\/\/ | ^ v ^ |
| ^ ^ ^ \ | /-----\ | | | /-----\ |
| | \ \ \ | | O | | | | | O | |
| | \ \ \ +--->| C |>----+ | +---<| R | |
| v v v \ | C | | | M | |
| +---+ +---+ +---+ \ | Q | v | Q | |
| | | | | | | \ |_____| +---------+ |_____| |
| |ILT| |LAT| |OLT| \ \_____/ | | \_____/ |
| | | | | | | \ ^ | R T | ^ |
| +---+ +---+ +---+ +------|-------->| | | |
| v | +---------+ | |
| | ^ ^ | |
| | /\/\/\/\/\/\/\/\ | | |
| | \ / | | |
| +----------->/ System \<-------+ | |
| \ Call / | |
| / Interpreter \>--------------------+ |
| \ / |
| +-->/ \>--+ |
| | \/\/\/\/\/\/\/\/ | |
+------------------|----------------------|----------------------+
| |
+---< system calls <---+
Request Connection, Receiver to Sender
______________________________________________
| | | | |
| RTS | my socket | your socket | link |
|_______|_____________|_______________|________|
Request Connection, Sender to Receiver
_____________________________________
| | | |
| STR | my socket | your socket |
|_______|_____________|_______________|
Close
_____________________________________
| | | |
| CLS | my socket | your socket |
|_______|_____________|_______________|
Allocate
__________________________
| | | |
| ALL | link | space |
|_______|________|_________|
Interrupt Sent by Receiving Process
_______________
| | |
| INR | link |
|______|________|
Interrupt Sent by Sending Process
_______________
| | |
| INS | link |
|______|________|
Echo Request
____________________________ _________
| | \ \ |
| ECO | length / / text |
|_______|____________________\ \________|
Echo Reply
____________________________ _________
| | \ \ |
| ERP | length / / text |
|_______|____________________\ \________|
Error Detected
____________________________ _________
| | \ \ |
| ERR | length / / text |
|_______|____________________\ \________|
____________
| USER | STRUCTURE OF THE NETWORK CONTROL PROGRAM
|____________|
^ | Fig. 4.1
_____|______V____
| |
| System |
| Call |
| Interpreter |
|_________________| _____________
^ | | | |
| | | +---------------| Input |
| | | | +-----| Interpreter |
| | | | | | |
| V V V V -------------
|======| |=========| |=======| | ^
| D Q | | O C C Q | | H I Q | | |
|======| |=========| |=======| | |
| ^ | | | |
| | | | | |
| +--------)----------)---------+ |
| | | |
+-------+ | +------+ |
__V___V___V__ |
| | |
| Output | |
| Scheduler | |
|_____________| |
| |
V |
(===========) (===========)
( O H B U F ) ( I H B U F )
(===========) (===========)
| ^
______V______ ______|______
| | | |
| Output | | Input |
| Handler | | Handler |
| | | |
------------- -------------
| ^
| |
+----------+ +-----------+
| |
____V____|____
| |
| I M P |
|______________|
______________
| | CLOSE
CONN/ | CLOSED |<---------------------------+
send RFC | (0) | LISTEN |
+----------------| |-----------------------+ |
| |______________| | |
| | ^ | |
| [E]RFC | | CLS/send CLS | |
| ___V____|____ ___V____|____
| non-matching | | | |
| CONN/send RFC | PENDING | LISTEN RFC | LISTENING |
| +-------------| (1) |----------+ +----| (2) |
| | |_____________| | | |_____________|
| | matching | | |
___V___V_____ CONN/send RFC| __V___V______
| | | ACCEPT/ | | CLS/
| RFC-SENT | RFC | send RFC | RFC-RECD | send CLS
| (5) |----------+ | +----------| (3) |---------+
|_____________| | | | |_____________| |
| | | | | | |
| | ___V___V___V___ SND&CLOSE | ____________ |
| | RCV&CLS/ | |-----------)->| | |
| | send CLS | OPEN | SND&CLS | | DATA-WAIT | |
| | +---------| (6) |--------+ | | (8) | |
| | | |_______________| | | |____________| |
| | | RCV&CLOSE/ | | | | |
| | | send CLS | | | | |
| | | | | | | CLS |
| | | ______V______ | | | |
| | | CLOSE/ | |CLOSE/ | | | |
| | | send CLS| CLS-WAIT |send CLS | | | |
| +---)--------->| (8) |<--------)--+ | |
| | |_____________| | | |
| | | ___V______V_ ______V___
| | | | | | |
| | | | RFNM-WAIT | | ABORT |
| | CLS | | (9) | | (4) |
| | | |____________| |__________|
| | | | |
| | ______V_______ RFNM/ | |
| | | | send CLS | |
| CLS/ +--------->| CLOSED |<----------+ |
| send CLS | (0) | ACCEPT|CLOSE |
+----------------->| |<----------------------------+
|______________|
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ / \ /
\ / \ port M /
\________/ \____^___/
|
RECEIVE ANY
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ / \ /
\ port N /--->SEND FROM --->\ port M /
\________/ ANY \________/
SITE K SITE L
________ R ________
/ \ e / \
/ \ n T/ \
/ \ d a \
| | e b Process B |
| Process A | z l |
| | v e |
\ / o \ /
\ port P / RECEIVE ---> u \ /
\________/ MESSAGE s \________/
SITE K SITE L
________ R ________
/ \ e / \
/ \ n T/ \
/ \ d a \
| | e b Process B |
| Process A | z l |
| | v e |
\ / o \ /
\ port P / u <--- port Q /
\________/ SEND s \________/
to site L
containing P & Q
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ port P / \ port Q /
\ / <---- transmission <---- \ /
\________/ to port T, site K \________/
containing data and L
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ / \ /
\ / RECEIVE--> port M /
\ / ANY \ /
\______/ \______/
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ port N / \ port M /
\ /--->SEND FROM --->\ /
\ / ANY \ /
\______/ \______/
______ ______
/ \ / \
/ \ / \
/ \ Rendezvous/ \
/ \ table \
| | | |
| Process A | ^ | Process B |
| | | | |
\ port P / | \ /
\ / | \ /
\ / <--RECEIVE __/ \ /
\______/ MESSAGE \______/
______ ______
/ \ / \
/ \ / \
/ \ Rendezvous/ \
/ \ table \
| | | |
| Process A | | Process B |
| | | |
\ port P / <--------- port Q /
\ / \ /
\ / SEND \ /
\______/ \______/
to site L
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ port P / \ port Q /
\ /<--transmission<--\ /
\ / \ /
\______/ to port P, site K \______/
_________________ __________________ _____________
| rendezvous site | <6> | destination site | | source site |
|-----------------| |------------------| |-------------|
| RECEIVE port | | RECEIVE port | | RECEIVE port|
|-----------------| |------------------| |-------------|
| SEND port | | SEND port | | SEND port |
|-----------------| |------------------| |-------------|
| | | source site | | |
| | |------------------| | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| data | | data | | data |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
|_________________| |__________________| |_____________|
transmitted transmitted received
by SEND by Network by RECEIVE
process Controller process
0 17 0 31
-------------------------- ------------------------------
| leader | | leader |
-------------------------- ------------------------------
| | 0 0 0 1| | 0 0 0 1 | |
-------------------------- ----------- |
| | | |
| | | |
| | | |
| message | | message |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
0 23
------------------------------------------
| leader |
| ----------------------
| | XXXXXXXXXXXXXXXX | <- contents of
|----------------------------------------- sending Host memory
| | (24 bits)
| Message |
| |
0 15
--------------------------------
| |
| |
| leader |
| |
--------------------------------
| |
| message |
| |
0 15 0 35
------------------------------ --------------------------------------
| | | |
| leader | | leader | 0000 |
------------------------------ --------------------------------------
| | | |
| message | | message |
| | | |
| | | |
1 2 1 L bits
---------------------------------------------------S-----------
|OUT- | | CLASS | |
|PUT | L+8 | DEP. | DATA |
|CLASS | | FIELD | |
---------------------------------------------------S-----------
1437 TR7/GROSSMAN LOGGED IN
___________________________
LINE PRINTER DOWN TILL 1600
___________________________
This acknowledges proper usercode and
sends any appropriate notes on system
status.
! LINK TO ILLIAC
The exclamation point (!) is the escape
character which flags direct input to
the PDP-11 OS:
| Half Duplex | Full Duplex
______________|_____________|_____________
| |
Character | |
Oriented | type1 | type2
| |
______________|_____________|_____________
| |
Line | |
Oriented | type3 | type4
| |
______________|_____________|_____________
1 4 4
+-----+--------------------+--------------------+
| STR | SS + 1 | US |
+-----+--------------------+--------------------+---+
| RTS | SS | SS + 1 | Q |
+-----+--------------------+--------------------+---+
1 4 4
+-----+--------------------+--------------------+
| STR | US + 1 | SS |
+-----+--------------------+--------------------+---+
| RTS | US | SS + 1 | R |
+-----+--------------------+--------------------+---+
1 4 3 1 1
+-----+--------------------+----------------+-----+-----+
| RTS | US | SERV | 1 | P |
+-----+--------------------+----------------+-----+-----+
1 3 1 4
+-----+----------------+-----+---------------------+
| CLS | SERV | 1 | US |
+-----+----------------+-----+---------------------+
1 4 4
+-----+--------------------+---------------------+
| STR | SS + 1 | US |
+-----+--------------------+---------------------+---+
| RTS | SS | US + 1 | Q |
+-----+--------------------+---------------------+---+
1 4 4
+-----+---------------------+--------------------+
| STR | US + 1 | SS + 1 |
+-----+---------------------+--------------------+---+
| RTS | US + 1 | SS | R |
+-----+---------------------+--------------------+---+
________________________________
| |
| ________________ |
| | local | | one
| | reference | | <== site ____________
| | material | | ( )
| -----------------| | ( )
| | => (____________)
| | || \\
| | || Other sites
| | || \\
| ________ | || ____________
| local =====> | |================ ( )
| users | agent |=====|===============( )
| =====> |________| | (____________)
| |
|________________________________|
| "2741" | "33, 35, 37" |
| hard wire | 2 separate |
| local echo | lines all |
| computer does | printed |
| not echo | |
____________|_________________|___________________|
Process | hard | X |
each | | |
character | | |
____________|_________________|___________________|
Process | X | easy |
only after | | |
EOL | | |
____________|_________________|___________________|
_____|_____|_____|_____|_____
| | | |
systems_____|_____|_____._____|_____
| | | |
_____|_____._____|_____|_____
| | | |
_____|_____|_____|_____|_____
| | | |
terminals
1 2 n 1 2 m
|----------------------------------------------------|
| n | | | | | m | | | | |
|----------------------------------------------------|
<------- record -----------> <-------- record ------->
Term Format 1
+---------------------------------------------------------------------+
| |
| name ( data replication . value : length ) |
| type expression expression expression |
| |
|_____________________________________________________________________|
CHECK <--- '10101111'BYTE + 01010000'BYTE + '11111010'BYTE +
'00000101'BYTE
ENDOFBLOCK<----'0'BYTE
REMOTE SITE CENTRAL SITE (CCN)
+---------------------+ +--------------------+
| a | | |
| Console Input o----------->o f |
| b | | |
| Console Output o<-----------o g |
| c | | |
| Card Reader o------------o h |
| d | | |
| Printer o<-----------o i |
| e | | |
| Card Punch o<-----------o j |
| | | |
+---------------------+ +--------------------+
36-Bit Words Transmitted
From MITDG's PDP-10 to
Harvard's PDP-1
+---------------+---------------+
| | count |
+---------------+---------------+
First word of results | |
Specified in Image+0. | |
| results |
| |
| |
| |
| |
| |
| |
Last word of results | |
specified in Image+1. | |
+-------------------------------+
Host Providing Host Providing
Computational Facility Reconfiguration Service
+--------------------+ STANDARD +-----------------------------+
| | FORMAT | +----------+ +-----------+ |
| |------------|--| Inter- |-| Display | |
| | (of Macro | /| preter | | Handler | |
| | Form Data) |//+----------+ +-----------+ |
+--------------------+ //--------------------|-------+
// |
/( +-----------+
/ \ | Terminal |
/ \ +-----------+
/ \
/ \
/ \
NON-STD. / \ NON-STD.
(Terminal Order Codes) / \ (Detailed Data)
/ \
/ \
/ \
/ \
/ \
/ \
| |
+-------|-------+ +-------|-------+
| | | | +-----------+ |
Minimum | | | | | Display | | Minimum
Host | | | | | Handler | | Host
| | | | +-----------+ |
+-------|-------+ +-------|-------+
| |
+-----------+ +-----------+
| Terminal | | Terminal |
+-----------+ +-----------+
<------------16------------>
__________________________
| |
|_ _ _ _ LEADER _ _ _ _ |
| |
|__________________________|
| |
| BYTE COUNT |
|__________________________|
| | |
BYTE SIZE-----|----> | |
|____________|_____________|
| | |
| |<------------|--Beginning of first
|____________|_____________| data byte
| |
| |
1 1 1 variable 1
+-------+-------+-------+ / +------//--------+-------+ \
| | | BREAK | / | | BREAK | \
| x'00' | x'00' | CHAR. | \ | CARD IMAGE | CHAR. | / ...
+-------+-------+-------+ \ +------//--------+-------+ /
1 1 1 2 L bits
+-------+-------+ / +-------+-------+-----//-----+ \
| | | / | | | TEXT | \
| x'00' | x'80' | \ | x'01' | L | card image | / ...
+-------+-------+ \ +-------+-------+-----//-----+ /
1 1 80
+-------+-------+ / +--------------------+ \
| | | / | | \
| x'00' | x'C0' | \ | card image | / ...
+-------+-------+ \ +--------------------+ /
+-----------------------------------+
| |
| leader |
| |
+--------+--------+-----------------+
| | | |
| M1 | S | C |
| | | |
+--------+--------+-----------------+
| | ^ |
| M2 | | |
| | | |
+--------+ | |
| | |
| | |
| |
| Text |
// //
| | |
| | |
| | |
| | |
| | +--------+
| | | |
| | | M3 |
| v | |
+-----------------+--------+--------+
| |
| 10 --------- 0 | <-- Padding
| |
+-----------------+
| 8 | 32 | 32 | 8 |
+-----+-----------------------+-----------------------+-----+
| | | | |
1. | STR | send socket | receive socket | |
| | | | ^ |
+-----+-----------------------+-----------------------+--|--+
|
| 8 | 8 | 16 | 32 | +-- byte size
+-----+-----+-----------+-----------------------+
| | | | |
2. | ALL | link| msg space | bit space |
| | | | |
+-----+-----+-----------+-----------------------+
| 8 | 8 | 16 | 32 |
+-----+-----+-----------+-----------------------+
| | | | |
3. | RET | link| msg space | bit space |
| | | | |
+-----+-----+-----------+-----------------------+
| 8 | 8 | 8 | 8 |
+-----+-----+-----+-----+
| | | | |
4. | GVB | link| fM | fB |
| | | ^ | ^ |
+-----+-----+--|--+--|--+
| |
| +-- bit fraction
+-------- message fraction
| 8 | 8 | 80 |
+-----+-----+---------------------- // -----------------------+
| | | |
7. | ERR | | text |
| | ^ | |
+-----+--|--+---------------------- // -----------------------+
|
+-- error code
| Hex Code
ASCII |-------+--------
Symbol | ASCII | EBCDIC
-------+-------+--------
DC3 | 13 | 3A
| |
` | 60 | 70
| |
\ | 5C | 71
| |
^ | 5E | 72
+---+---+---+---+---+---+---+---+
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+---+---+---+---+---+---+---+---+
Code Structure
| <code><filler count><NUL><data count><NUL> | <data><filler> |
| |____||____________||___||__________||___| | |____________| |
| | | | | | | | |
| 24-bits 8-bits 8-bits 24-bits 8-bits| variable length |
| <-------descriptor field 72-bits---------> |<--data and filler-->|
| | |
8 16 32
______________//______//_________//__________//_________________//__
| | | | | | | | |
| OP | | | ACCESS |MODIFICATION| NEW | | |
|CODE|FLAGS|FILENAME|PASSWORD| PASSWORD | FILENAME|BIT COUNT| DATA |
|____|_____|___//___|__//____|____//______|___//____|_________|__//__|
8 8*LENGTH
________________________//___
| | |
| LENGTH | FILENAME/PASSWORD |
|________|_______________//___|
M
O
D
I
F
I
A C
C A
C T
E I N
S O E
S N W
B
F P P F I
O I A A I T
P L S S L
F E S S E C
C L N W W N O D
O A A O O A U A
D G M R R M N T
E S E D D E T A
_____________________________________________________________
ALF X X X X X X
_____________________________________________________________
UDF X X X X X X
_____________________________________________________________
RPF X X X X X X
_____________________________________________________________
RTF X X X X X
_____________________________________________________________
SPF X X X X X
_____________________________________________________________
DLF X X X X
_____________________________________________________________
RNF X X X X X
_____________________________________________________________
FNO X
_____________________________________________________________
NOP X
_____________________________________________________________
8 8 32
_________//___________________________//____
| OP | | CMPL | | |
|CODE | FILENAME | CODE |BIT COUNT| DATA |
|_____|___//_____|______|_________|____//____|
8 8*LENGTH
_______________//______
| | |
| LENGTH | FILENAME |
|________|______//______|
C
O
M
P
L
E
F T B
I I I
O L O T
P E N
C
C N C O D
O A O U A
D M D N T
E E E T A
_____________________________________________________
RTF X X X X X
_____________________________________________________
SPF X X X X
_____________________________________________________
Receiver NCP Sender
-+---+---+---+---+ +--------+ +-----+-----+---
|000|001|010|011| <--- | Buffer | <--- |00000|10100|11
-+---+---+---+---+ +--------+ +-----+-----+---
31 1
+-------------------------------+-+
1. | Arbitrary | | <-- gender
+-------------------------------+-+
24 7 1
+------------------------+------+-+
2. | User ID | tag | | <-- gender
+------------------------+------+-+
+--------------------- ---------------------+
| |
| Fixed, unique / / Variable |
| Identifier / / Identifier |
| |
+--------------------- ---------------------+
_________ _________/ _________ _________/
/ /
Identifies the Identifies a particular
program uniquely connection of the program
24 7 1
+------------------------+---------+-+
| Program Number |Multiplex| | <-- Gender
| | Code | |
+------------------------+---------+-+
|<------- 32 ------->|<-8->|<-8->|<-- 16 -->|<-8->|<---
+--------------------+-----+-----+----------+-----+------------------
| leader | x |size | count | x | TEXT
+--------------------+-----+-----+----------+-----+------------------
|<---- level 1 ---->|
message leader
|<------------------ level 2 ------------------>|
message preamble
USING HOST Serving HOST
-----------------------+ +----------------------
| |
\ | | /
\ -----------------| +-+ +-+ |-----------------/
\ NCP | |I| |I| | NCP /
\ ^ <--->|M|---NETWORK--|M|<---> ^ /
\ -----|-----+ | |P| |P| | +-----|-----/
\ v | | +-+ +-+ | | v /
USER \ | | | | TELNET / USER
PROCESSES, ) TELNET |--| |--|Protocol( PROCESS
Sub <===> | | | |Routing<--->Sub
Systems, / ^ | | | | ^^ \Systems
ETC /-----|-----+ | | +----||-----\ETC
/ TTY v <---> Local Local <===> TTY vv \
/ Handles | Terminals Terminals| Handles <===>
/-----------------| |-----------------\
/ | | \
| |
-----------------------+ +----------------------
+-------------+ CC +-----------+ SC +-----------+
| ORIGINATING +--------+ DRS +--------+ SERVER |
| USER | ^ | | ^ | PROCESS |
+-------------+ | +------+----+ | +-----------+
| / |
Telnet / <------ Simplex or Duplex
Protocol UC/ Connections
Connection /
/
+-----+-----+
| USER |
| PROCESS |
+-----------+
+--------------+
+--------+ CC | |
+-------+ TELNET +-------+ DRS |
| +--------+ | |
| +--------------+
+----------+---------+
| USER |
|(TERMINAL OR PROGRAM|
+--------------------+
+--------+ CC +--------+ +------+
| +------+ | SC | |
+------+ /| TELNET | UC | DRS +------+ SP |
| |/ | +------+ | | |
| USER | /+--------+ +--------+ +------+
| |/
+------+
+--------+
+------+ /| USER | CC +--------+ +------+
| |/ | SIDE +------+ | SC | |
| USER | +--------+ UC | DRS +------+ SP |
| |\ | SERVING+------+ | | |
+------+ \| SIDE | +--------+ +------+
+--------+
/\/\ /\/\
^ | | FORM | | ^
| | | ----------------- | | |
| | | +- ----------------- -+ | | |
| | | | CURRENT PART OF | | | |
INPUT | |<= CURRENT < ----------------- > CURRENT => | | OUTPUT
STREAM | | POINTER | FORM BEING APPLIED | POINTER | | STREAM
| | +- ----------------- -+ | |
| | ----------------- | |
| | ----------------- | |
| | ----------------- | |
\/\/ \/\/
Figure 5. Application of Form to Data Streams
|
| +-----------------
| /:
| / :
| / :
| / :
| / :
| / :
-----+------------------------------------
| a
|
|<------- 32 ------->|<-8->|<-8->|<-- 16 -->|<-8->|<---
+--------------------+-----+-----+----------+-----+------------------
| leader | x |size | count | x | TEXT
+--------------------+-----+-----+----------+-----+------------------
|<---- level 1 ---->|
message leader
|<------------------ level 2 ------------------>|
message preamble
USING HOST Serving HOST
-----------------------+ +----------------------
| |
\ | | /
Sub- \ -----------------| +-+ +-+ |-----------------/
Sys- \ | |I| |I| | NCP /
tems+---> <--->|M|---NETWORK--|M|<---> ^ /
| \ NCP | |P| |P| | +-----|-----/
| \ | +-+ +-+ | | v /
| \ | | | TELNET / USER
TELNET )___________| |--|Protocol( PROCESS
| ) | | |Server <--->Sub
| / | | | ^^ \Systems
| / TTY | | +----||-----\ETC
User +---> HANDLER <---> Local | TTY vv \
Pro- / | Terminals | Handles \
cesses/-----------------| |-----------------\
/ | | \
| |
-----------------------+ +----------------------
+------------+ +------+ +---------+
| ORIGINATING| CC | DRS | SC | SERVER |
| USER |--------------| |----------| PROCESS |
+------------+ ^ +------+ ^ +---------+
| / |
| UC/ <-----\ |
| / \ |
| +-----------+ \|
TELNET ---------+ | USER | +-- Simplex or Duplex
Protocol | PROCESS | Connections
Connection +-----------+
+---------+ CC +---------+
+---------| TELNET |-------| DRS |
| +---------+ +---------+
+-----------------------+
| USER |
| (TERMINAL OR PROGRAM) |
+-----------------------+
+-------+ +--------+ CC +-----+ +----+
| |----| |---------| | SC | |
| USER | | TELNET | UC | DRS |--------| SP |
| |----| |---------| | | |
+-------+ +--------+ +-----+ +----+
+---------+
+------+ /| USER | CC +-----+
| |---/ | SIDE |--------| | SC +----+
| USER | +---------+ UC | DRS |--------| SP |
| |---\ | SERVING |--------| | +----+
+------+ \| SIDE | +-----+
+---------+
/\/\ /\/\
^ | | FORM | | ^
| | | ----------------- | | |
| | | +- ----------------- -+ | | |
| | | | CURRENT PART OF | | | |
INPUT | |<= CURRENT < ----------------- > CURRENT => | | OUTPUT
STREAM | | POINTER | FORM BEING APPLIED | POINTER | | STREAM
| | +- ----------------- -+ | |
| | ----------------- | |
| | ----------------- | |
| | ----------------- | |
\/\/ \/\/
Figure 5. Application of Form to Data Streams
+------------------+---------------------+---------------------+
| Type | I send | I receive |
| | | | | | | | | | | | | | | | | |
| B3 |0|0|BA|B2|B9|B1|B8|B0|0|0|BA|B2|B9|B1|B8|B0|
+------------------+---------------------+---------------------+
+------------------+------------------+
| Type | End Code |
| | | |R| |
| | |G|E| |
| B4 | F|R|C|U|
| | I|O|O|N|
| | L|U|R|I|
| | E|P|D|T|
+------------------+------------------+
+------------------+-------------------+-----------------+
| Type | Error Code | Sequence # |
| | | |
| B5 | | |
+------------------+-------------------+-----------------+
+-------------------+--------------------+
| Type | Function |
| | | | |R| |
| | | |G|E| |
| | |F|R|C|U|
| | |I|O|O|N|
| | |L|U|R|I|
| | |E|P|D|T|
+-------------------+--------------------+
Read / List_file_directory request
------------------------------------->
User <File -- data> Server
<-------------------------------------
End of file indication
<-------------------------------------
User Store / Append request Server
------------------------------------->
<File -- data>
------------------------------------->
End of file indication
------------------------------------->
Acknowledge
<-------------------------------------
User Rename_from request Server
------------------------------------->
Rename_to request
------------------------------------->
Acknowledge
<-------------------------------------
User Delete Server
------------------------------------->
Acknowledge
<-------------------------------------
O 15 16 23 24 30 31
---------------------------------------------------
| | | | |
---------------------------------------------------
^ ^ ^ ^
|_ zero | | |_ gender
| |
| |_ zero for initial
| contact, otherwise
| dynamically assigned
| by 3rd level user
| program
|_ administratively assigned (fixed
and associated with programs)
1 4 3 2 2 3
+-----------------------+ +-----------------+ +-------------------+
| | | | | | | | | | |
| B | BL | CLR | | TX | | | OR | SZ | |
| | | | | | | | | | |
+-----------------------+ +-----------------+ +-------------------+
NETWORK | Using Host
| +-------+
| | |
| | NGDL | +--------+ +-------+
+--------+ | |--------->| | | |
| |------>| | | NGLI |------>| NGS |
| NGDS | +-------+ | | | |
| | +-------+ | | | |
| |------>| |--------->| | +-------+
+--------+ |IMAGE | +--------+
| |AREA | ^
| |DEFINI-| |
| |TIONS | V
| +-------+ *--------+
| | NGLES |
| | & |
| | NGLP |
| +--------+
+----------------------------+
| | _______
| +---------+-----------+ | / \
| | |OUTPUT | | / \
| | /-->|PROCESSOR |----|------------>| |
| | / +-----------+ | \ /
| | | | | \_______/
| | | | | OUTPUT DEVICE
| | | +-----------+ | ______
| | \ |INPUT | | | \
| | \---|PROCESSOR |<-- |-------------|_______\
| +---------+-----------+ |
| Graphic Application | INPUT DEVICE
| Program |
+----------------------------+
/SERVING\ HOST
\USING /
+-------------------------------------+ ______
| | /---->/ \
| +-----------+ |DEVICE-DEPENDENT/ ___/___ \
| +-----------+ |--|---------------/ / \ |
| STANDARD | OUTPUT | | |DISPLAY LIST / \ /
| +-----+DISPLAY LIST|PROCESSOR |-+ | | |__/
| | ---|----------->| |----|---------------->\ /
| | | | +-----------+ | \_______/
| | | | | OUTPUT DEVICE(S)
| | | | |
| | | | +-----------+ |DEVICE-DEPENDENT ______
| | | | STANDARD +-----------+ |<-|----------------------| \
| | |--|<-----------|INPUT | | |INPUT DATA ___|___ \
| +-----+ ATTENTION |PROCESSOR |-+ | | \____\
| | |<---|------------------| \
| +-----------+ | |_________\
| Graphic Application Program | INPUT DEVICE(S)
| |
+-------------------------------------+
/SERVING\ HOST
\USING /
The initializing call is GRIDSET(N, M, IRNGE)
|<--- I ------>|
where N is the number of spaces --- +--+--+--+--+--+--+--+--+
across, M is the number down, ^ |--|--|--|--|--|--|--|--|
and IRNGE tells how many grey | |--|--|--|--|--|--|--|--|
levels to use. This is primarily J |--|--|--|--|--|--|--|--|
for grey-scale displays or | |--|--|--|--|--|--|--|--|
pseudogrey-scale displays. v |--|--|--|--|--|--|--|--|
--- |--|--|--|--|--|--|--|--|
|--|--|--|--|--|--|--|--|
+--+--+--+--+--+--+--+--+
The display mode is raster ________________________
oriented, and each "pseudo- | _ _ _ _ _ _ |
character" will be on a N x M | |_| |_| |_| |_| |_| |_||
matrix of dots. (A later | _ _ _ |
embellishment for printers | |_| |_| |_| . . . |
would include matrix of characters.) | _ _ |
Parameters DEFINITION and CODE | |_| |_| . . . |
are both arrays, used together to | . \ \ |
specify the "pseudo-character" set. | . \ \ |
DEFINITION is packed with bits |________\___\___________|
according to the following scheme: \ \
\ \
\ __\_______
\ / \
\/ ________ \
/ |_|_|_|_| \
/ |_|_|_|_| \
| |_|_|_|_| |
| |_|_|_|_| |
\ |_|_|_|_| /
\ |_|_|_|_| /
\ /
\___________/
_ <-----------------------------------+
| |
| |
- <--If WAR here, it is set to here,+
| and error condition 5 is
| recognized.
|
Establish network connection
SETUP,,0 ; start
2n,,0 ; data representing "n" line
; segments follow
+----------------+ _
| | |
| | - 2n coordinate pairs
| | _|
+----------------+
TRANSMIT,,2 ; request ARDS transmission
0,,1000 ; convert and transmit the
; whole "program"
FLUSH,,0 ; signoff
+-->length,,2000 ; length of display pgm
| - ; large output area
| | -----
| | -----
+--> -----
| program
| -----
| -----
-
| NC |
--------------- ^
| /
----> in | out /
--------------------------------
| Express Exchange |
<---- --------------------------------
out in ^
\
\
Net Controller
-------------------------------
| | |
NJID(1) NJID(2) - - - NJID(N)
---------------------- . . . . .
| |
Stepname Stepname
-------------------------------
| | |
LMID(1) LMID(2) LMID(n)
-----------------------------------
| |
LMSN(1) LMSN(2) LMSN(n)
<---- n text bytes ------>
+--+-----+ +--------+ +--------+ +--------+
TRUNCATED <--> |11|Devid| | n (8) | | Text | . . . | Text |
RECORD | | (6) | | | | (8) | | (8) |
+--+-----+ +--------+ +--------+ +--------+
/ \
| +---+----+ | *
| |110| n | (n blanks) |
| | |(5) | |
| +---+----+ |
| |
+--+-----+ / +---+----+ +--------+ |
COMPRESSED<--> |10|Devid|< |111| n | |Char- | (n replications |
RECORD | | (6) | \ | |(5) | | acter | of "Character") |
+--+-----+ | +---+----+ +--------+ |
| |
| +--+-----+ +--------+ +--------+ |
| |10| n | | Text | . . .| Text | |
| | | (6) | | (8) | | (8) | |
| +--+-----+ +--------+ +--------+ |
\ /
+------+
| X'00'|
| |
+------+
Telnet-
NCP- ICP User Server like Log-on Accessed
NCP-1 107 80 Telnet Telnet Protocol Procedure Services
-----------------------------------------------------------------
SDC | x | | | | | | | |
-----------------------------------------------------------------
UCLA-91 | | x | | x | x | | | |
-----------------------------------------------------------------
UCLA-S7 | x | x | x | x | x | | x | x |
-----------------------------------------------------------------
SRI-10 | | x | | | | x | x | |
-----------------------------------------------------------------
UCSB | x | x | x | | | | x | x |
-----------------------------------------------------------------
MIT-10 | | x | | x | | | | |
-----------------------------------------------------------------
MIT-645 | |par-| | | | | | |
| |tial| | | | | | |
-----------------------------------------------------------------
LL-67 | x | | x | | x | | | |
-----------------------------------------------------------------
BBN-10 | | x | | | | x | x | x |
-----------------------------------------------------------------
UTAH | x | x | x | | | x | | |
-----------------------------------------------------------------
+------------------+ +------------------+
|Initial Input Ptr.| | Output pointer |
+------------------+ +------------------+
+------------------+ +------------------+
|Current Input Ptr.| | True/False Flag |
+------------------+ +------------------+
+---------------------+
| length n in bytes |
+-- +---------------------+
| | |
| | compiled |
| | 16-bit |
n < | instructions |
| | |
| | |
| | |
+-- +---------------------+
+-----------------+
| length n |
| in bytes |
+-- +------------------+-----------------+
| | numeric value of | byte offset |
| | statement number | in inst. seq. |
| +------------------+-----------------+
| | : : |
n < | : : |
| | : : |
| | |
| | |
| | |
+-- +------------------------------------+
+-------------+--------------+
1 1 | length n | length n |
___/\____ ___/\____ | in bytes | in bytes |
+---------+----------+-------------+--------------+
/ | |//////////| | |
| | Type |//////////| bit length | byte offset |
| | |//////////| | |
| +---------+----------+-------------+--------------+
5*n < | : |
| | : |
| | : | Identifiers
| | |
\ | |
+-------------------------------------------------+
/ | |
| | literals are |
| | byte-aligned | Literals
m < | |
| | |
| | |
\ +-------------------------------------------------+
+---+---+-----+-------+ +-------------------+ word-aligned,
| T |///| L | ---+-----> | | 32-bit right-
+---+---+-----+-------+ +-------------------+ justified
byte-aligned, L <= 256
+---+---+-----+-------+ +------------------------+
| T |///| L | ---+-----> | |
+---+---+-----+-------+ +------------------------+
+--------+------------------------+
| 4 | 12 |
+--------+------------------------+
|
/
/
/
|
V
LD = 0 literal or identifier reference (12-bit positive integer)
IC = 1 12-bit two's complement integer constant
OP = 2 operator
AD = 3 address (12-bit positive integer)
ARB = 4 indefinite replication factor
NULL = 5 missing attribute of term
4 4 8
+--------+--------+----------------+
| 0010 | |////////////////|
+--------+--------+----------------+
OP |
+----------> 0 = binary operator
1 = unary operator
2 = special operator
+---+ <-- TOS +-----+ <-- TOS
| y | | x-y |
e.g. x-y => +---+ ===> +-----+
| x | |/////|
+---+ +-----+
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0000 | |////////|
+--------+--------+--------+--------+
|
+--------------------------+
|
V
0 = integer +
1 = integer -
2 = integer x
3 = integer : (or /), no remainder
4 = concatenate ||
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0001 | | |
+--------+--------+--------+--------+
| |
+--------------+ |
| |
V |
0 = integer minus V
1 = load identifier 0 = evaluated contents
(after dec - binary
conversion)
1 = length field
2 = type field
2 = Label Table Reference
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0010 | | |
+--------+--------+--------+--------+
| |
+-----------------------+ /
| /
V /
0 = store TOS |
1 = return V
2 = branch 0 = true, 1 = false, 2 = unconditional
8 8 16 16
+----------+----------+---------------+---------------+
| Op code | 0 | X - coord. | Y coord. |
+----------+----------+---------------+---------------+
0 1 2 3 4 5
8 8 8 8 16 16 16 8 8 8 8
+--+---+-----+-----+---.---+---.---+---.---+-----+-----+ +-----+-----+
|Op| 1 |Flags|Scale| N.o | . | . |delta|delta|..|delta|delta|
| | | | |poi.nts| X0. | Y0. | X1 | Y2 | | Xn | Yn |
+--+---+-----+-----+-------+-------+-------+-----+-----+ +-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 2n+10 2n+11
8 8 8 8 8 16 16 16 8 8 8 8
+--+-+-----+-----+----+---.---+---.-+---.-+-----+-----+ +-----+-----+
|Op|2|Flags|Scale|Rate| N.o | X0. | Y0. |delta|delta|..|delta|delta|
| | | | | |poi.nts| . | . | X1 | Y1 | | Xn | Yn |
+--+-+-----+-----+----+----------+--+-----+-----+-----+ +-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 2n+11 2n+12
---- +-------------+-----
^ | | ^
| | | |
| | W
2W | Xp, Yp __|__v__
| |
| | |
v | |
-----+-------------+
| <-- 2W --> |
8 8 8 8 8 8 16 16 16 16 16 16 16
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
|3|Flags|Scale|Rate |Window| # | X0 | Y0 |Xmin|Ymin |Xmax |Ymax |
| | | | | Size |points| | | | | | |
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
8 8 8 8 8 8
-----+-----+-----+-//-----+-----+-----+
delta|delta| RCP1| //delta|delta| RCPn|
X1 |Y1 | | Xn | Yn | |
-----+-----+-----+-//-----+-----+-----+
20 21 22 20 21 22
8 8 8 8 8 8 16 16 16 16 16 16 16
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
Op|3|Flags|Scale|Rate |Window| # | X0 | Y0 |Xmin |Ymin |Xmax |Ymax |
| | | | | Size |points| | | | | | |
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
8 8 8 8 8
-----+-----+-----+ +-----+-----+
delta|delta|delta|...|delta|delta|
X1 |Y1 | X2 | |Xn |Yn |
-----+-----+-----+ +-----+-----+
20 21 22 2n+20 2n+21
-+
CURSOR m |
WRITE n, text - URSA writes a request
LOCAL |
-+
-+
+- +-+ |_ User types response
| _BREAK_ | |
- -User Presses | _TRANSMIT_ |key - - -+
+- -+ -+
SAVE |
CURSOR p - URSA reads response
SREAD |
-+
+--------------------+
| |
+------>| LOCAL |------+
| +--->| State | |
| | +--------------------+ |
| | | | |
| | | | |
| | |Break | |
| | | | | INS received
LOCAL | | | key | |
| | | [send INS | |
Command | | | and X'80'] | |
Executed| | | |Transmit|
| | Reset | | |
| | | | key |
| | key | | |
| | v v |
| | +--------------------+ |
| +---| Control |<------+
| | State |
+------| |
| +--------------------+
| ^
| | Keyboard locked,
| | Execute Commands
+------+
After INS is
received, LOCAL
command is ignored
until SYNC (X'80')
is encountered
To | | Also |Push | Or |Code Sent |Upon receipt
Send| (Explanation)| Known as |Either| |is (in hex)|Displayed as
----+--------------+----------+------+---------+-----------+------------
NUL |NULL | ^@ | [2] | | 00 |
| | | | | |
SOH |Start of | [3]^A | LS |[4]CASE A| 01 |
| Heading | | | | |
| | | | | |
STX |Start of Text | ^B | ATAN | CASE B | 02 |
| | | | | |
ETX |End of Text | ^C | LOG | CASE C | 03 |
| | | | | |
EOT |End of | | | | |
| Transmission| ^D | REFL | CASE D | 04 |
| | | | | |
ENQ |Enquiry | ^E | [4] | CASE E | 05 | [5] <ENQ>
| | | | | |
ACK |Acknowledge | ^F | UP | CASE F | 06 | <ACK>
| | | | | |
BEL |Bell | ^G | DOWN | CASE G | 07 | <BELL>
+--------------------------------------------------------------+
| |
| |
| |-+
| UCSB OLS INIT STATS | |Feed-
| |-+back
| |-+
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |OLS
| | |Dis-
| | |play
| | |Area
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| |-+
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
+--------------------------------------------------------------+
| |
| |
| |-+
| UCSB OLS CONNECTED | |Feed-
| |-+back
| ENTER USER NUMBER 196 |-+
| ID NUMBER= | |
| USER NAME= ARPA | |
| JOB NAME= RAND/RFC | |
| AUTOSAVE CODE = 3 | |
| LOAD MOLSF | |
| FILE LOADED | |
| | |
| | |
| | |OLS
| | |Dis-
| | |play
| | |Area
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| |-+
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
+--------------------------------------------------------------+
| |
| ___ ___ |-+
| / \ / \ | |
| / \ / \ | |
| / \ / \ | |
| / \/ \ | |
| / /\ \ | |
| / / | |
| / \ \ | |
| / \ \ | |
| / / | |
| \ \ | |
| / / \ \ | |
| ___________________________________________ | |
| | |
| \ | | \ | |OLS
| / / | |Dis-
| \ \ | |play
| / / | |Area
| \ / \ | |
| / \ | |
| \ / / | |
| \/ / \ | |
| \ / \ | |
| / \ / \ | |
| / \ / \ | |
| __/ \___/ \__ | |
| |-+
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
User < File -- Data> Server
<-----------------------------
End of file indication
<-----------------------------
Create / Store / Append / Append_with_create requests
----------------------------->
User <File --- Data> Server
----------------------------->
End of file indication
----------------------------->
Acknowledge
<-----------------------------
User Rename_from request Server
----------------------------->
Rename_ro request
----------------------------->
Acknowledge
<-----------------------------
User Delete Server
----------------------------->
Acknowledge
<-----------------------------
A. User site sending at time path is broken:
/
/ Append at sequence number
| ------------------------------------------->
| Acknowledge
| <------------------------------------------
| Data
| ------------------------------------------->
|
\ The server site agrees to resume at the user-chosen point.
\ The first data transaction is numbered with the chosen
\ sequence number.
/ Append at sequence number
/ ------------------------------------------->
| Use this sequence number
| <-------------------------------------------
| / Data
| / --------------------------------->
| \ The user site agrees to use the server-chosen number
| \ and the first data transaction is numbered with the
| \ chosen number.
|
| or
|
| / Unsuccessful Terminate
\ / ------------------------------->
\ \ The user site cannot restart at this number for
\ \ some reason.
/ Resume Retrieve
/ ------------------------------------>
| Unsuccessful Terminate
\ <------------------------------------
\ The server site is unable or unwilling to restart the
\ transmission.
/ Retrieve at sequence number
/ ---------------------------------------->
| Data
| <----------------------------------------
\ The server agrees to resume at the user-chosen
\ point. The first data transaction is numbered
\ with the chosen sequence number.
/ Retrieve at sequence number
/ ---------------------------------------->
| Unsuccessful Terminate
| <----------------------------------------
|
| The server site will never permit restart for some
| reason.
| Retrieve at sequence number
| ---------------------------------------->
| Use this sequence number
| <-----------------------------------------
| / Acknowledge
| / ---------------------------->
| | Data
| | <----------------------------
| \ The user site agrees to use the
| \ server-chosen number. The first data
| \ transaction is numbered with the chosen
| \ number.
|
| or
|
| / Unsuccessful Terminate
| / ----------------------------->
| |
\ \ The server cannot use the user-chosen
\ \ number and the user cannot use the
\ \ server-chosen number. Therefore the attempt
\ \ to restart must be abandoned.
/ \
| PR [INTER] | _ _
| | | |
O [PEN] # < PU [NCH] >| (jobname) | [ =socket-number[ /host-name ]]
| | | |
| R [EADER] | | (*) |
\ / |_ _|
/ \
RJT # R [ECFM] (device) = < T [ELNET] >
| A [SA] |
| R [ECORDS] |
| C [OMPRESSED] |
\ /
+---------+ +--------+
! INPUT ! ! OUTPUT !
+--! routine !<------||---------! driver !<--+
! +---------+ +--------+ !
! ^ !
V ! !
+---------+---------+ +---------+ ! +---------+
! ! Graphic ! ! Graphic ! ! ! !
! PROCESS ! Data ! ! Data !<->! ! DISPLAY !
! ! Base ! ! Base ! ! ! !
+---------+---------+ +---------+ ! +---------+
! ! ^
! V !
! +---------+ +--------+ !
! ! OUTPUT ! ! INPUT ! !
+->! routine !-------||-------->! driver !---+
+---------+ +--------+
1. USER SERVER
---- ------
Set data type '02' (Network ASCII)
------------------------------------->
Store File X
------------------------------------->
File X (in Network ASCII)
------------------------------------->
End of File
------------------------------------->
Acknowledge
<-------------------------------------
Retrieve File X
------------------------------------->
File X in Network ASCII
<-------------------------------------
End of File
<-------------------------------------
2. USER SERVER
---- ------
Set data type'03' (EBCDIC)
------------------------------------->
Retrieve File Y
------------------------------------->
Set data type '00' ("bit-stream")
<-------------------------------------
File Y as stored (no conversion)
<-------------------------------------
End of File
<-------------------------------------
Set data type '02' (Network ASCII)
------------------------------------->
Retrieve File Z
------------------------------------->
File Z in Network ASCII
<-------------------------------------
End of File
<-------------------------------------
,---------------.
| |
| DCF' |
Sending | |
Host `---------------'
\ ^ /
\_____________|__________/
|
/ | ^
File / | |
Xfer / |
Protocol / DRS | |
/ Protocol |
/ | |
/ |
,----------. /\ ,---------./ /\ ,------------|--.
| | / \ | | / \ | |
| TELNET |---\ / ---| DCF |---\ / ---| DRS | |
| | \/ | | \/ | |
`----------' | |\ `------------|--'
^ `---------' \File |
| ^ | \Xfer DRS | |File
| | | \Protocol Protocol | Xfer
v | v \ | |Proto-
,----------. ,---------. \ | col
| USER | | | \ | |
| TERMINAL | | CATALOG | \ | v
| | | | \ _______________________
`----------' `---------' / | \
/ v \
Receiving ,---------------.
Host | |
| DCF' |
| |
`---------------'
RAND UCLA
________________ ________________
| PDP-10 | | 360/91 |
______ | | | |
| | | __________ | | __________ |
|File | | | RJS | | | | | |
|System|___|__| Access |__|___/\/\ Network /\____|__| RJS | |
| | | | Program | | \/ \/ | | | |
|______| | |__________| | | |__________| |
| | | | |
| | | | |
|_______|________| |________________|
|
|
User
TENEX 1.28,RAND EXEC 1.33.1 Rand Exec Prompt
@_LOGIN_ \
(USER) _HARSLEM_ \ User Logs In
(PASSWORD)______ /
(ACCOUNT #)_1__ /
JOB 12 ON TTY10 25-FEB-72 11:12 System Acknowledges
@_RJS_ User Starts RJS
Access Program
16 16
+----------+------------+
word 0 | Day # | Time |
+----------+------------+
| |
1 - 365 (6 on leap year) |______
|
Time in minutes at which sample was
started. Ranges from 0 (midnight) to 1439.
8 8
+--------+------+-------+----------+
word 1 | Source | Byte | N | Format |
| Host | Size | | |
+--------+------+-------+----------+
| | | |_____________
___________| | | |
| | | |
Network | | +-----+-----+--+--+--+--+
Host number | | | | |C |R |B |M |
| | +-----+-----+--+--+--+--+
| | | | | |
| | | | | message
| number of HOST | | | statistics
| related entries | | |
| in message | | |__byte
| | | statistics
| | |
number of bits per | |__average
byte in byte statistics | round-trip
| time
|
|__control
message
distribution
<-------32--------->
+---------------------+
| Foreign HOST # | always present
/ +---------------------+
| | messages received | if FORMAT bit M set
| +---------------------+
| | Bytes received | if FORMAT bit B set
N of these | +---------------------+
entries | | message sent | if FORMAT bit M set
| +---------------------+
| | Bytes sent | if FORMAT bit B set
| +---------------------+
\ | Average delay | if FORMAT bit R set
+---------------------+
This is average RFNM
delay in milliseconds
+---------------+ +---------------+
______ | UTAH | NETWORK | UCLA |
/ \ | +---------+ | | +---------+ |
+ + | | | | / / | | | |
|\______/| | | |>-|-------/ /------|->| | |
| |----+--| NETRJS | | : / / |: | RJS | |
| FILE | | | |<-|-----/ /--------|-<| | |
| SYSTEM | | | | | / / | | | |
\ / | +---------+ | | +---------+ |
\______/ | | | | |
+-------|-------+ +---------------+
1 UCLA SIGMA-7 Server # Limited Jon Postel
65 UCLA IBM-360/91 NETRJS now Bob Braden
(Telnet in April
2 SRI(NIC) PDP-10 Server John Melvin
66 SRI(AI) PDP-10 Server Len Chaiten
3 UCSB IBM-360/75 Server Jim White
4 UTAH PDP-10 Server Barry Wessler
*5 BBN(NCC) DDP-516 Never Alex McKenzie
69 BBN(TENEX-A) PDP-10 Server Dan Murphy
133 BBN(TENEX-B) PDP-10 Server(Exper.) Dan Murphy
6 MIT(Multics) H-645 Server Mike Padlipsky
70 MIT(DM) PDP-10 Server Bob Bressler
*134 MIT(AI) PDP-10 User Now Jeff Rubin
*7 RAND IBM-360/65 User Only Eric Harslem
71 RAND PDP-10 Server Eric Harslem
*8 SDC IBM-360/155 Server Bob Long
9 HARVARD PDP-10 Server Bob Sundberg
*73 HARVARD PDP-1 User Only Bob Sundberg
10 LINCOLN IBM-360/67 "Soon" Joel Winett
74 LINCOLN TX-2 Server Will Kantrowitz
11 STANFORD PDP-10 "Soon" Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 June Charles Rose
14 CARNEGIE PDP-10 "Soon" Hal VanZoeren
*15 AMES ILLIAC Server John McConnell
(B6500)
16 AMES IBM-360/67 "Soon" Wayne Hathaway
*144 AMES TIP User Only
*145 MITRE TIP User Only
*19 NBS PDP-11 User Only Robert Rosenthal
*147 NBS TIP User Only
*148 ETAC TIP User Only
*23 USC TIP User Only
*158 BBN TIP User Only
(Prototype)
_______________
*Host not included in daily testing.
#The NMC is a research site and would like
to have prior arrangement with each user.
1 UCLA SIGMA-7 Server # Limited Jon Postel
65 UCLA IBM-360/91 NETRJS now Bob Braden
(Telnet in April)
2 SRI(NIC) PDP-10 Server John Melvin
66 SRI(AI) PDP-10 Server Len Chaiten
3 UCSB IBM-360/75 Server Jim White
4 UTAH PDP-10 Server Barry Wessler
*5 BBN(NCC) DDP-516 Never Alex McKenzie
69 BBN(TENEXA) PDP-10 Server Dan Murphy
133 BBN(TENEXB) PDP-10 Server (Exper.) Dan Murphy
6 MIT(Multics) H-645 Server Mike Padlipsky
70 MIT(DM) PDP-10 Server Bob Bressler
*134 MIT(AI) PDP-10 User Now Jeff Rubin
*7 RAND IBM-360/65 User Only Eric Harslem
71 RAND PDP-10 Server Eric Harslem
*8 SDC IBM-360/155 Server Bob Long
9 HARVARD PDP-10 Server Bob Sundberg
*73 HARVARD PDP-1 Server Bob Sundberg
10 LINCOLN IBM-360/67 "Soon" Joel Winett
74 LINCOLN TX-2 Server Will Kantrowitz
11 STANFORD PDP-10 "Soon" Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 June Charles Rose
14 CARNEGIE PDP-10 "Soon" Hal VanZoeren
*15 AMES ILLIAC Server John McConnell
(B6500)
16 AMES IBM-360/67 "Soon" Wayne Hathaway
*144 AMES TIP User Only
*145 MITRE TIP User Only
*19 NBS PDP-11 User Only Robert Rosenthal
*147 NBS TIP User Only
*148 ETAC TIP User Only
USC IBM-360/44 "Soon"
*151 USC TIP User Only
*152 GWC TIP User Only
*158 BBN TIP User Only
(Prototype)
_____________________
*Host not included in daily testing.
#The NMC is a research site and would like to have prior arrangement
with each user.
+--------------------+ +----------+ +--------------------+
|HOST SND | | | |HOST RCV |
| | | | | |
| | | | | |
| (PROCESS) | +----------+ | |
| ( S ) | HOST | |
| \ | RNDZ | (PROCESS) |
| [DATA]| | ( R ) |
+--------------------+ +--------------------+
+-----------------------------------+
|HOST SND MSP _ _ _ |
| ------------->|_ _ _| |
| / ^ |_ _ _| <-|-------RENDEZVOUS
| / | |_ _ _| | TABLE
|(PROCESS) | |
|( S ) +-- SEND (from=S to=R; rend=RNDZ)
| \ |
| [DATA] |
+-----------------------------------+
HOST SND HOST RNDZ
+------------+ +---------------------------+
| MSP| "OUT" + DATA |MSP _____ RENDEZVOUS |
| |--------------------|--> |_ _ _| TABLE |
| | from=S; to=R | \ |_ _ _| |
| | | \ |_ _ _| |
+------------+ | \ __ |
| \---------->| | DATA |
| |__|BUFFER |
| |
+---------------------------+
HOST RNDZ HOST RCV
+------------------------+ +-----------------------+
| MSP | | MSP |
| TABLE _____ | | _____ TABLE |
| +-|_ _ _| | "IN" | |_ _ _| |
| | |_ _ _|<-|----------|_ _ _|<-\ |RECEIVE
| | |_ _ _| | | |_ _ _| \ <--|(from=S
| | | | \ | to=R
| _V_ | | \ | rend=RNDZ)
| BUFFER | | | | (PROCESS) |
| |___| | | ( R ) |
+------------------------+ +-----------------------+
HOST SND HOST RCV
+------------------+ +------------+ +-------------+
| | | TABLE | | |
| TABLE ___ | "IN" | ___ | "OUT" | ___ TABLE|
| |___| | | |___| | + DATA | |_ _| |
| |___|<---|--------|---|___|----|---------|->|_ _| |
| |___| | | |___| | | |_ _| |
| ( S ) | +------------+ | ( R )|
| | HOST RNDZ | |
+------------------+ +-------------+
------ _________ ------
( ) | | ( )
( ) SEND | | RECEIVE ( )
( )------>|--+ +---|<--------( )
( ) | \/ | ( )
( ) (IN) | /\ | (OUT) ( )
( )<------|--+ +--|-------->( )
(______) |_________| +DATA (______)
---- _______ ______ ----
( ) | | | | ( )
( ) SEND | | IN | | RECEIVE( )
( )------>|-+ +--|<------------|------|<-------( )
( ) | \/ | | | ( )
( ) (IN) | /\ | OUT+DATA | | (OUT) ( )
( )<------|-+ +--|------------>|------|------->( )
(____) |_______| |______| +DATA (____)
---- ______ _______ ----
( ) | | | | ( )
( ) SEND | | OUT+DATA | | RECEIVE( )
( )------>|------|------------->|-+ +--|<-------( )
( ) | | | \/ | ( )
( ) (IN) | | IN | /\ | (OUT) ( )
( )<------|------|<-------------|-+ +--|------->( )
( ) | | | | +DATA ( )
(____) |______| |______ | (____)
---- ______ _______ ______ ----
( ) | | | | | | ( )
( ) SEND | | OUT+DATA | | IN | |RECEIVE( )
( )------>|------|--------->|-+ +--|<---------|------|<------( )
( ) | | | \/ | | | ( )
( ) (IN) | | IN | /\ |OUT+DATA | | (OUT) ( )
( )<------|------|<---------|-+ +--|--------->|------|------>( )
( ) | | | | | | +DATA ( )
(____) |______| |______ | |______| (____)
|<---- Host K ----->|<--Net-->|<-Host->|<--Net-->|<----- Host L ----->|
M
+-------------+
| | ////////// = unused
| | //////////
+-------------+
8 bits
0 8 16 24 32 36
+-------------+-------------+-------------+-------------+------+
0 | HOST/IMP | FOREIGN | LINK | ////////////////// |
| FLAGS | HOST | | ////////////////// |
+------+------+-------------+-------------+-------+-----+------+
1 | //// | TO PORT ID | MESSAGE |
| //// | | TYPE |
+------+------+-------------+-------------+-------------+------+
2 | FROM PORT ID | TABLE | //// |
| | POSITION | //// |
+------+-------------+-------------+------+-------------+------+
3 | //// | SOURCE | RENDEZVOUS | BIT COUNT |
| //// | HOST | HOST | |
+------+-------------+-------------+---------------------------+
| |
4 | |
// DATA //
| |
| |
+-------------+-------------+-------------+-------------+------+
+------+--//---+------+------+--//---+------+------+-------+-------+
|char 0| 1// n | null |char 0| 1// n | null | port | number| delay |
| | // | | | // | | | |spec |
+------+--//---+------+------+--//---+------+------+-------+-------+
\ /\ /\ /\ /
\_________________/ \___________________/ \___________/ \____/
PARAMETER 1 PARAMETER 2 PARAMETER 3 PARAMETER
4
Parameters given:
+-------------------------------------+
| Full ASCII |
| a b ... z | ` ^ { } ~ |
| |
+-----+-------------------------------------+--------------+
|33/35| | AT&T TWX |
| | ` [ ] | (Mod 33/35 |
| | | tty) |
+------+-----+------+-----------------------+ | |
|Basic | | | | | |
|EBCDIC| | | <SP> | | |
| | | " | A B ... Z | | <left arrow> |
| | | ! | 0 1 ... 9 | | |
| | | | + - * / ( ) | | <up arrow> |
| | | | . , ' = | | |
| | | | $ & | | |
| | | | < > : ? % # @ | | |
| | | | | | |
| +-----+------+-----------------------+------+--------------+
| | | | |
| | | _ | |
| | | | |
| +------+-----------------------+------+
| | |
| | PL/1 <bent bar> | |
| | Set |
| +-----------------------+
| <cent sign> |
| Basic EBCDIC |
+-------------------------------------------+
TELNET
connections
File Server Server<------------ User User File
Systems<-> FTP <->TELNET FTP Commands TELNET<->FTP <->System
Process ------------> Process
Data
<------------------------------>Socket
Data Connection(s) |
|
USER
ftp (host) multics CR ICP to HOST S, socket 3,
establishing TELNET connections.
username Doe CR USER DoeCRLF ---->
<---- 330 passwordCRLF
password mumble CR PASS mumbleCRLF ---->
<---- 230 Doe logged in.CRLF
retrieve (local type ASCIICR
(local pathname) test 1 CR USER-FTP open local file in ASCII.
(for. pathname) test.pl1CR RETR test.pl1 CRLF ---->
<---- 255 SOCK 1233CRLF
Server makes data connection to (U+4).
<---- 250 File transfer startsCRLF
<---- 252 File transfer completeCRLF
type imageCR TYPE |CRLF ---->
<---- 200 Command OKCRLF
byte 36CR BYTE 36CRLF ---->
<---- 200 Command OKCRLF
store (local type) ImageCR
(local pathname) file dumpCR User-FTP opens local file in Image.
(for. pathname) >udd>cn>fdCR STOR >udd>cn>fdCRLF ---->
<---- 451 Access deniedCRLF
terminate BYECRLF
<---- 231 Doe logged outCRLF
Server closes all connections.
-------------------------------------------------------------------
SITE | RELIABILITY| RESPONSE | FRIENDLINESS | # HOURS | COMMENTS |
| | | | USED | |
-----|------------|----------|--------------|----------|----------|
| | | | | |
| | | | | |
% State
+--------+-------------------------------------------+
| | Unable to Log in to any site. |
|--------|-------------------------------------------|
| | Unable to Log in to Desired site. |
|--------|-------------------------------------------|
| | Foreign site suddenly crashes. |
|--------|-------------------------------------------|
| | Local site crashes. |
|--------|-------------------------------------------|
| | Trouble free operation. |
|--------|-------------------------------------------|
| | Other |
+--------+-------------------------------------------+
-1 -2 -3 -16 0 -1 -2 -15
-2 2 2 ... ...2 -2 2 2 ... 2
+--+--+--+--+---------+--+--+ +--+--+--+--+---------+--+--+
| | | | | | | | | | | | | | | |
+--+--+--+--+---------+--+--+ +--+--+--+--+---------+--+--+
^ ^
+--+--+--+--+--+--+-----------------+--+--+--+--+
| | | | | | | ... ... | | | | |
+--.--+--+--+--+--+-----------------+--+--+--+--+
Bit position 0 1 2 3 ...... 14 15
16 16
+----------+------------+
word 0 | Day # | Time |
+----------+------------+
| |
1 - 365 (6 on leap year) |______
|
Time in minutes at which sample was
started. Ranges from 0 (midnight) to 1439.
8 8
+--------+------+-------+----------+
word 1 | Source | Byte | N | Format |
| Host | Size | | |
+--------+------+-------+----------+
| | | |__________
_______| | | |
| | number of HOST |
Network Host | related entries +---+---+---+---+---+---+
number | in message | | | C | R | B | M |
| +---+---+---+---+---+---+
number of bits per | | | |
byte in byte statistics ____ ____| | | message
| ___| | statistics
| | byte
control | statistics
message distribution |
average
round-trip time
SUN.&
HOLIDAYS MON. TUES. WED. THURS. FRI. SAT.
0000+--------+-------+-------+-------+-------+--------+-------+
| | | | | | | |
| | | Z | | | | |
| | Z | | Z | Z | | |
0400| Z | +-------+ +-------+ Z | Z |
| | | | | | | |
0600| +-------+ +-------+ +--------+ |
0700| | R | * | R | * | R +-------+
0800+--------+-------+-------+-------+-------+--------+ R |
| | | | | | | |
1000| | | | | | +-------+
| | | | | | | |
| | | | | | | |
| R | M | M | M | M | M | M |
| | | | | | | |
| | | | | | | |
| | | | | | | |
1700+--------+-------+-------+-------+-------+--------+-------+
| | | | | | | |
| | | | | | | R |
2000| Z | R | R | R | R | R +-------+
| | | | | | | |
2200| | | | | | | Z |
| | | | | | | |
2400+--------+-------+-------+-------+-------+--------+-------+
(a) ______ for authentication ______
| | | | |
| |<-----------+------------->| User |
|______| | / |______|
Host |/
X
/|
_______ / |
| | / v
| |<---
|_______|
Authenticator
(b)
______ ______
| | | |
| |<--\ ^ /-->| User |
|______| \ | / |______|
Host \ | /
------------+--/
| /
|/
|
/|
/ |
/ | authentication
_______ / | complete
| | /
| |<------
|_______|
Authenticator
NY Terminal NY Enroute Boston Enroute Boston Terminal
_____ _____ _____ _____
| | / | | \ | | | |
|Host1|<----/--->|Host2|<---\---->|Host3|<----->|Host4|
|_____| \ / |_____| \ / |_____| |_____|
X move X
/ \ | / \
| \ V / |
V \ _____ / V
reconnect \ | | / reconnect
->|Host5|<-
|_____|
NY Enroute
H2 H3 H2 H3
___ ___ ___ ___
| | | | | | | |
| C|<-+ |D | | C|<------>|D |
|___| | |___| |___| |___|
|
|
| ___ ___
| | | | |
+->|A | |A |
|___| |___|
H1 H1
H2 H3
______ ______
| | | |
| C | | D |
---\-- -/----
\ /--> <--\ /
\- -/--- --- --- --- --- \---/
\ / \ /
X X
/ \ / \
/ \ / \
reconnection \ / reconnection
\ ________ /
---|A B|---
| |
|________|
H1
H1 H4 H1 H4
____ ____ ____ ____
| | | | | | | |
| C| |E | | C|--------|E |
|____| |____| |____| |____|
H2 H3 H2 H3
____ ____ ____ ____
| | | | | | | |
| B|--------|D | | B| |D |
|____| |____| |____| |____|
___ ___
| P |---------------| Q |
|___| |___|
____________________
| P --> Q || R R Q |
|_________||_________|
|
+---------+
|
____V_______________________________________
| || | | |
| Q --> P || R O K | R N O ----| R R Q |
| || | | E | |
|_________||_________|_________|___|_________|
| |
+------------+ v
| Yes +----------+ No
| +------------------------| NP > NQ? |------+
| | +----------+ |
__v___v_______________________________ |
| || | | |
| P --> Q || R D O ----| R N O ----| |
| || | E | | E | |
|_________||_________|___|_________|___| |
|
+--------------------------------------------+
|
____v_________________________________
| || | |
| Q --> P || R D O ----| R N O ----|
| || | E | | E |
|_________||_________|___|_________|___|
H2 H3 H2 H3
___ ___ ___ ___
| | | | | C|--------|D |
|_C_| |_D_| |___| |___|
| |
| | ===>
| ____ | ____
---|A B|--- | |
|____| |____|
H1 H1
| ASCII | EBCDIC
---------------+---------+------------
Not Print File | |
---------------+---------+------------
Print File | |
---------------+---------+------------
<------------------<
A Process 1 Process 2
>------------------>
neither end echoes
<------------------<
B Process 1 <--+ Process 2
^
>--^--------------->
one end echoes for itself
<------------------<
C Process 1 <--------------+ Process 2
^
>--------------^--->
one end echoes for the other
<--------------V---<
D Process 1 <--+ V Process 2
^ +--->
>--^--------------->
both ends echo for themselves
<-----V------------<
E Process 1 <--+ V Process 2
^ +------------>
>--^--------------->
one end echoes for both ends
case 1) message (1) + implicit req (1)--->
<--- RFNM (arrived ok)
[discard copy of msg]
case 2) message (1) + implicit req (1)---> no room, don't respond
<--- All (1) (room available)
message (1) --->
[discard copy of msg] <--- RFNM (arrived ok)
H-> I line
----------> First packet of multipacket
arrives. Halt H->I line and
send REQ (8) -------------->
start 30 sec. Time-out
If time-out, resend
REQ (8) and restart -------->
time-out.
<--------ALL (8) when available. Start
long term (2 min.) time-out.
On time-out, reset all
outstanding reservations.
P A
O C
E K
+-------+-----+------------------------+-----+----------+
typical packet | | | | | |
| | | | | |
+-------+-----+------------------------+-----+----------+
IMP A IMP B
----- -----
ROE | SOE ROE | SOE
| POE ACK |
| +-----------+ |
IMP A blocks send 1 | 0 (1)| 0 1 |-> 1 | 0 IMP B NOPS,
channel. | +-----------+ | flips ROE
| |
| POE ACK |
| +-----------+ |
IMP A frees send 0 | 1 <-| 0 0 |(2) 0 | 0 IMP B blocks
channel, | +-----------+ | channel for
Flips SOE | | new traffic
| POE ACK |
IMP A blocks send | +-----------+ crashes|
channel | (3)| 1 0 |->or gets|
| +-----------+ lost |
| |
| POE ACK |
IMP A detects packet | +-----------+ |
duplicate (POE=ROE) 0 | 1 <-| 0 0 |(2) 0 | 0 IMP B
so does not change | +-----------+ | retransmits no
SOE bit. | | ACK received
| POE ACK |
IMP A retransmits | +-----------+ | IMP B flips
packet 3 | (3)| 1 0 |-> 1 | 1 SOE, unblocks
| +-----------+ | channel, and
| | flips ROE.
| POE ACK |
IMP A flips ROE, | +-----------+ |
flips SOE 1 | 0 <-| 1 1 |(4) |
| +-----------+ |
| |
start state F = free
| I = in use
V X = don_t care
+-----+ +------+ N = new packet
| FX | --------------> | I, N | O = old packet
+-----+ +------+
^ |
| |
| |
| |
ACK | |
received | |
| V
| +------+
+-------------------| I, O |---+
+------+ |
^ | re-transmissions
+------+
TELNET
Connections
+-----+ +-------+ +------+ +------+ +-------+ +-----+
| File|<->|Server-|<->|Server|<----------|User |<->|User- |<->|File |
|Sys | |FTP | |TELNET| FTP Cmds |TELNET| |FTP | |Sys- |
| -tem| |Process| | |---------->| | |Process| | tem |
+-----+ | | +------+FTP Replies+------+ | | +-----+
| | | |
| |<------------------------------->|Data |
| | Data Connection(s) |Socket |
+-------+ +-------+
|
|
+------+
| |
| USER |
| |
+------+
+-------------+-------------+---------------+
| Don't care | Descriptor | |
| 12 bits | code=4 | Byte count=2 |
+-------------+-------------+---------------+
+----+---------+---------+--------+---------+
| | Marker | Marker | Marker | Marker |
| | 8 bits | 8 bits | 8 bits | 8 bits |
+----+---------+---------+--------+---------+
+----+---------+---------+--------+---------+
| | Marker | Marker | SP | SP |
| | 8 bits | 8 bits | 8 bits | 8 bits |
+----+---------+---------+--------+---------+
STRU F | R
+-------------------------------+-----+-----+------+
TYPE |\ MODE | | | |
| \ | | | |
| \ S T B | S | T | B |
| FORM +--------+-----+---------+-----+-----+------+
A | U | 8 | 8 | 8 | 8 | 8 | 8 |
| +--------+-----+---------+-----+-----+------+
| P | 8 | 8 | 8 | 8 | 8 | 8 |
----+------+--------+-----+---------+-----+-----+------+
E | U | 8 | | 8 | 8 | | 8 |
| +--------+-----+---------+-----+-----+------+
| P | 8 | | 8 | 8 | | 8 |
----+------+--------+-----+---------+-----+-----+------+
I | U | 1-255 | | 1-255 | | |1-255 |
----+------+--------+-----+---------+-----+-----+------+
L | U | 1-255 | | 1-255 | | |1-255 |
----+------+--------+-----+---------+-----+-----+------+
ftp (host) multics CR ICP to HOST S, socket 3,
establishing TELNET connections.
username Doe CR USER Doe CRLF ---->
<---- 330 password CRLF
password mumble CR PASS mumble CRLF ---->
<---- 230 Doe logged in. CRLF
retrieve (local type) ASCII CR
(local pathname) test 1 CR User-FTP opens local file in ASCII.
(for.pathname) test.p11 CR RETR test.p11 CRLF
<---- 255 SOCK 1233 CRLF
Server makes data connection to (U+4).
<---- 250 File transfer starts CRLF
<---- 252 File transfer complete CRLF
type ImageCR TYPE I CRLF ---->
<---- 200 Command OK CRLF
byte 36CR BYTE 36 CRLF ---->
<---- 200 Command OK CRLF
store (local type) image CR
(local pathname) file dump CR User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd CR STOR >udd>cn>fd CRLF ---->
<---- 451 Access denied CRLF
terminate <---- 231 Doe logged out CRLF
Server closes all connections.
n bytes of data
/--------/\--------\
1 B-1 / B B \
+---+------+ +--------+ +--------+
Byte String: | 0 | n | | d |. . .| d |
| | | | 1 | | n |
+---+------+ +--------+ +--------+
String of n data bytes d(1),...,d(n)
Count n must be positive
2 B-2 B
+----+------+ +---------+
Replicated Byte: | 1 0| n | | d |
+----+------+ +---------+
String consisting of n replications of the data byte d
2 B-2
+----+------+
Filler String: | 1 1| n |
+----+------+
String of n filler bytes. The filler byte is a "space"
character for ASCII or EBCDIC type, or a binary zero
byte for Image or Local Byte Type.
B B
+----------+ +----------+
Control Escape Sequence: | 0......0 | | C | (see below)
+----------+ +----------+
+---------------+
| |
+----------| USER PROCESS |----------+
| | A | |
telnet +---------------+ telnet
| |
| |
+-----------+ +-------------+
| |--------> --------->| |
| SERVER |data sockets data socket| SERVER |
| B | Sb Sc | C |
| |<-------- <---------| |
+-----------+ +-------------+
USER A TO SERVER B USER A TO SERVER C
__________________ __________________
__ __
| |
| ;D[DOCUMENT] |
| ;M[MESSAGE] |
<userid> | ;C[COPIES]= <integer> |
| ;BIN= <integer> |
|__ __|
UCSB UCLA
|------------------------------------------| |-----------------|
+--------+ +-------+ +-------+
| | | | | |
| | 500 Kb/s | | | |
|SEL810-B| +------+ | +------+ |IBM | |IBM |
| |<-|INTER-|<->|INTER-|->|360/75 | |360/91 |
| |->|FACE | |FACE |<-| | | +----+|DISCARD
| | +------+ +------+ | | | | NCP|-->+----+
| | | | | +----+| | |
+--------+ +---^---+ +----^--+ +----+
| | |<--100 Kb/s--> | |
V V | V |
+-----+ +-----+ +-----+
| D/A | | IMP |<---/ /<---| IMP |
+-----+ | |--->/ /--->| |
| +-----+ \ / +-----+
-|\ | \ /
-| \<-+ 50 Kb/s
-| /
-|/SPEAKER
Figure 1. Hardware configuration of data path used
for sending real-time data from the
SEL 810-B to the UCLA host discard socket.
..........
|----|----|----|----|-----------|----|----|----|----|
^ 1 2 3 4 n-4 n-3 n-2 n-1 ^
| |
0 n
B E
+--------+ +--------+ +---------+
| IMP 2|--------|3 IMP 4|--------|5 IMP |
| 1 | | | | 6 |
+---|----+ +--------+ +----|----+
| |
+---|----+ +----|----+
| | | |
| Host | | Host |
+--------+ +---------+
-------------
!/---------\!
!! User !! --------
!!Interface!<--->! User !
!\----:----/! --------
---------- ! V !
!/------\! FTP Commands !/---------\!
!!Server!<-----------------! User !!
!! PI !----------------->! PI !!
!\--:---/! FTP Replies !\----:----/!
! V ! ! V !
-------- !/------\! Data !/---------\! --------
! File !<--->!Server!<---------------->! User !<--->! File !
!System! !! DTP !! Connections !! DTP !! !System!
-------- !\------/! !\---------/! --------
---------- -------------
TELNET ------------ TELNET
-----------! User-FTP !------------
! -------->! User-PI !<--------- !
! ! ! "C" ! ! !
V ! ------------ ! V
-------------- --------------
! Server-FTP ! Data Connection ! Server-FTP !
! "A" !<-----------------------! "B" !
-------------- Socket(A) Socket(B) --------------
ftp (host) multics<CR> ICP to Host S, socket 3,
establishing TELNET connections
<---- 330 Awaiting input <CRLF>
username Doe <CR> USER Doe<CRLF>---->
<---- 330 password<CRLF>
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 Doe logged in.<CRLF>
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for.pathname) testp11<CR> RETR test.p11<CRLF> ---->
Server makes data connection to
(U+4)
<---- 250 File transfer starts
<CRLF>
<---- 252 File transfer
complete<CRLF>
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
byte 36<CR> BYTE 36<CR>LF ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 451 Access denied<CRLF>
terminate BYE <CRLF> ---->
Server closes all connections.
Weekday Hourly Load Averages
July 1973
^ B BBN-TENEX
| I ISI-TENEX
10 +
|
| B
|
+
|
|
|
+ B
Load |
Avg. | B
| I
+
|
|
| *
+ I
|
| B I B
| B
5 +
|
| B I
| I
+ I
|
|
| B
+ I B
| B
| I
| I I B B
+ I
| I B I
| B
| B I B
+ I I I
| B * B
| * * I I *
| B B
---+--+-----------+-----------+-----------+-----------+>
| 0-1 AM 6-7 AM 12-1 PM 6-7 PM 12
(midnight) (noon) (midnight)
Time of Day (Eastern Daylight Time)
SPECIAL PACKET BIT ___
|
|
___HELLO/I-HEARD-YOU BIT | ___ UNUSED __
| | | |
| | | |
V V V V
_______________________________________________________________
| | | | | |///////| | |///| |
| | | | | |///////| | |///| |
|___|___|___|___|___|___|___|___|___|___|///|///|___|___|///|___|
^ ^ PACKET WORD COUNT ^ ^ ^ ^
| | ( 6 BITS ) | | | |
| | | | | CHANNEL
| | | | | NUMBER
| | | | |
| PACKET HOST/IMP BIT | CHANNEL ZERO
| ODD/EVEN BIT | ACKNOWLEDGE BIT
| |
LAST PACKET BIT CHANNEL ONE
ACKNOWLEDGEMENT BIT
--+--2.0
|
|
| +++ (3)
| ++++
| ++
| +
| ++
ooo **** --+-- ooo ***+
o o** ** | o o** + **
o *o * | o *o + *
o * * | o * + *
o * o * | o * o *
* o * | * + o *
o ** ** |o ** ++ **
| * | o * | * ++ o | * (1) |
|-------**-------+-----------+++++o+++++-----------+-------**-------|
|-4.0 | o ++ | o | (2) |4.0
++ o| o
o + | o
o o | o o
+ o | o
+ o o | o o
+ o o | o o
+ ooo --+-- -1.0 ooo
++ |
+ |
++ |
++++ |
+++ |
|
|
--+-- -2.0
Data from Plasma
|Msb|x|x|x|x|x|x|x|x|Lsb|P| <----------------
| | | | | | | | | | * Terminal
| | | | | \ \ \ \ \ Parity for Keyboard
| | | | | \ \ \ \ \ data is regenerated
| | | | | \ \ \ \ \ at the PLATO System
| | | | | \ \ \ \ \ end.
| | | | | \ \ \ \ \
/ / / / / \ \ \ \ \
/ / / / / \ \ \ \ \
Data to | | | | | | | | | |
<-------- |x|x|x|x|x|1|1|0|<--|x|x|x|x|x|1|0|0|
Network
_____________________________________
| | / /
| ______ ___________ | \ \
| | |---| | | / /
| | | | DATA | | \ \
| | | |DESCRIPTION| _______ | DATALANGUAGE ___________
| | | |___________| | |<-------------------->| |
| |STORED| |________| USER | | PATH |APPLICATION|
| | DATA |__________________|REQUEST| | | PROGRAM |
| | | |_______|<----!--------------->|___________|
| | | ___________ | ! DATA PATH
| | | | | | ! / /
| | | | PORT |-----! \ \
| | | |DESCRIPTION| | / /
| |______| |___________| | \ \
|_____________________________________| / /
NETWORK
Figure 2-1
A Model of Datacomputer/User Interaction
___________________________________________ _______________
| ____________ | | ___________ |
| |APPLICATION | | | |APPLICATION| |
| _| DATA |_|____|_| PROGRAM | |
| | |DESCRIPTIONS| | | |___________| |
| | |____________| | |_______________|
| | ^ | HOST 1
| ______ | | |
| | | | _____|______ |
| | | | | DATA | |
| | | | | FUNCTIONS | |
| | | | |____________| | _______________
| | | ___________ | ____________ | | ___________ |
| | | | STORED |__| | | | | |APPLICATION| |
| | |__| DATA |____| |_|____|_| PROGRAM | |
| |STORED| |DESCRIPTION|__ | | | | |___________| |
| | DATA | |___________| | |____________| | | |
| | | ^ | ____________ | | ___________ |
| | | | | | | | | |APPLICATION| |
| | | _____|_____ | | |_|____|_| PROGRAM | |
| | | | DATA | |_| | | | |___________| |
| | | | FUNCTIONS | |____________| | |_______________|
| |______| |___________| | HOST 2
|___________________________________________|
DATACOMPUTER
| _______
| |____
| __|GENERAL|____
| | DMS |____
| | |_______|
_________ ________ _________ |
| | | HIGHER | | |__| _______ ________
|PRIMITIVE|___| LEVEL |___|LOW-LEVEL|_____|COBOL | | COBOL |
|LANGUAGE | |LANGUAGE| | SYNTAX |__ |SERVER |___|PROGRAM |
|_________| |________| |_________| | |_______| |________|
| | _______
|__|ON LINE|
| | QUERY |_______
|_______| |
| ___|____
|TERMINAL|
| | USERS |
|________|
|
APPLICATION APPLICATIONS
| SERVERS
_________________
| |
| _____________ |
| | X | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | STRING | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| "ABC" |
/|____________|
VALUE
_________________
| |
| _____________ |
| | Y | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | BOOL | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| TRUE |
/|____________|
VALUE
_________________
| _____________ |
| | SMITH | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
___________V_____
| _____________ |
| | X | |
| |_____________| |
| NAME | _________________
| _____________ | | _____________ |
_____|_|____ | | | | Y | |
| | |_____________| | | |_____________| |
| | DESCRIPTION | | NAME |
| | _____________ | | _____________ |
| __|_|____ | | | | ____|_|_____
| | | |_____________| | | |_____________| | |
| | | VALUE | | DESCRIPTION | |
| | | _____________ | | _____________ | |
| | | | ____|_|_____\| | ____|_|__ |
| | | |_____________| | /| |_____________| | | |
| | | SIBLING | | VALUE | | |
| | |_________________| |_________________| | |
| | OBJECT OBJECT | |
| | _________________ _________________ | |
| |_\| "ABC" | | FALSE |/_| |
| /|_________________| |_________________|\ |
| VALUE VALUE |
| _________________ _________________ |
| | _____________ | | _____________ | |
| | | STRING | | | | BOOL | | |
|____\| |_____________| | | |_____________| |/____|
/| TYPE | | TYPE |\
|_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________ _________________
| _____________ | | _____________ |
| | R | | | | STRUCT | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | ____________V____
| | VALUE | | _____________ |
| | _____________ | | | STRING | |
| | | | | | |_____________| |
| | |_________|___| | ___\| TYPE | _____________
| | CHILD | | | /| _____________ | | _________ |
| |___________|_____| | | | ____|_|______\| | STRING | |
| OBJECT | | | |_____________| | /| |_________| |
| | | | SIBLING | | TYPE |
| ___________V_____ | |_________________| |_____________|
| | _____________ | | DESCRIPTION DESCRIPTION A
| | | A | | | |
| | |_____________| | | _________________ |
| | NAME | | | _____________ | |
| | _____________ | | | | B | | |
| | | ____|_|__| | |_____________| | |
| | |_____________| | | NAME | |
| | DESCRIPTION | | _____________ | |
| | _____________ | | | ____|_|___________________|
| __|_|____ | | | |_____________| |
| | | |_____________| | | DESCRIPTION |
| | | VALUE | | _____________ |
| | | _____________ | | | ____|_|____
| | | | ____|_|______\| |_____________| | |
| | | |_____________| | /| VALUE | |
| | | SIBLING | | _____________ | |
| | |_________________| | | | | |
| | OBJECT | |_____________| | |
| | | SIBLING | |
| | |_________________| |
| |__________ OBJECT _____________|
| _______|__________________________|_______
|____\| _____V_______ _______V_____ |
/| | "ABC" | | FALSE | | Figure 4-3
| |_____________| |_____________| | A STRUCT with
|__________________________________________| two members
_________________
| _____________ |
| | L | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | LIST | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | | ________ |
| | | | | | | |
| |_______|_____| | | |______|_| |
| VALUE | | | CHILD | |
|_________|_______| |________|___|
OBJECT | DESCRIPTION |
| |
_________V_______ ________V___
| | | ________ |
| _____________ | | | STRING | |
| | "ABC" | | | |________| |
| |_____________| | | TYPE |
| _____________ | |____________|
| | "XY" | | DESCRIPTION
| |_____________| |
| _____________ |
| | "ZLM" | |
| |_____________| |
| : |
| : |
| _____________ |
| | "BBBF" | |
| |_____________| |
|_________________|
VALUE
_________________
| |
| _____________ |
| | STAR | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
|
|
|
V
_________________
| |
| _____________ |
| | BLOCK | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
|
|
___________V_____
| |
| _____________ |
| | TOP/LEVEL | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | ____|_|___ DESCRIPTION
| |_____________| | |
| SIBLING | |
| _____________ | |___\ ALL BLOCKS AND
| | | | / LOCAL T/OBJECTS
| |_________|___| |
| CHILD | |
|___________|_____|
|
|
V
_________________ _________________
| | | |
| _____________ | | _____________ |
| | | | | | | |
| | X | | | | Y | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_______|_____| | | |_______|_____| |
| VALUE | | | VALUE | |
|_________|_______| |_________|_______|
OBJECT | OBJECT |
| |
_________V_______ _________V_______
| | | |
| "ABC" | | "DEF" |
|_________________| |_________________|
VALUE VALUE
_________________ _________________
| | | |
| _____________ | | _____________ |
| | | | | | | |
| | X | | | | Y | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_______|_____| | | |_______|_____| |
| VALUE | | | VALUE | |
|_________|_______| |_________|_______|
OBJECT | OBJECT |
| |
_________V_______ _________V_____
| | | |
| "DEF" | | "DEF" |
|_________________| |_________________|
VALUE VALUE
_________________ _________________
| | | _____________ |
| _____________ | | | | |
| | L | | | |_____________| |
| |_____________| | | TYPE |
| NAME | | _____________ |
| _____________ | | | | |
| | ____|_|______\| |__________|__| |
| |_____________| | /| CHILD | |
| DESCRIPTION | |____________|____|
| _____________ | DESCRIPTION |
| | | | |
| |_________|___| | ____________V____
| VALUE | | | _____________ |
|___________|_____| | | STRING | |/___
OBJECT | | |_____________| |\ |
| | TYPE | |
___________V_____ |_________________| |
| | DESCRIPTION |
| _____________ | |
| | "ABC" | | _________________ |
| |_____________| | | | |
| _____________ | | _____________ | |
| | "XY" | | | | M | | |
| |_____________| | | |_____________| | |
| _____________ | | NAME | |
| | "ZLM" |/|___ | _____________ | |
| |_____________|\| | | | ____|_|____|
| : | | | |_____________| |
| : | | | DESCRIPTION |
| _____________ | | | _____________ |
| | "BBBF" | | |___|_|____ | |
| |_____________| | | |_____________| |
|_________________| | VALUE |
VALUE |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | L | | | | | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
| | | |/__ DESCRIPTION |
| |_________|___| |\ | ____________V____
| VALUE | | | | _____________ |
|___________|_____| | | | STRING | |/___
OBJECT | | | |_____________| |\ |
| | | TYPE | |
___________V_____ | |_________________| |
| _____________ | | DESCRIPTION |
| | "ABC" | | | _________________ |
| |_____________| | | | | |
| _____________ | | | _____________ | |
| | "XY" | | |___|_|____ | | |
| |_____________| | | |_____________| | |
| _____________ | | LIST | |
| | "ZLM" | | | _____________ | |
| |_____________| | | | | | |
| : | | |_________|___| | |
| : | | MEMBER | | |
| _____________ | | : | | |
| | "BBBF" |/|___ | : | | |
| |_____________|\| | |___________|_____| |
|_________________| | OPD | |
VALUE | ___________V_____ |
| | _____________ | |
| | | M | | |
| | |_____________| | |
| | NAME | |
| | _____________ | |
| | | ____|_|____|
| | |_____________| |
| | DESCRIPTION |
| | _____________ |
|___|_|____ | |
| |_____________| |
Figure 4-9 | VALUE |
OPD, LIST and member |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | F | | | | STRUCT | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
| | | | DESCRIPTION |
| |___________|_| | ____________V____ _________________
| VALUE | | | _____________ | | _____________ |
| ___________|_ | | | STRING | | | | STRING | |
| | | | | | |_____________| | | |_____________| |
| |_________|_|_| | | TYPE | | TYPE |
| CHILD | | | | _____________ | | _____________ |
|___________|_|___| ____\| | | | | | | |
OBJECT | | | /| |_____________| | | |_____________| |
| | | | SIBLING | | SIBLING |
| | | |_________________| |_________________|
| | | DESCRIPTION DESCRIPTION A
| | | ______________________________________ |
| | | | ____________ ____________ | |
| | | | | "ABC" | | FALSE | | |
| |_____|_____| |____________| |____________| | |
| | |________A_____________________________| |
| | ............: VALUE |
___________V_____ | : _________________ |
| _____________ | | : | _____________ | |
| | A | | | : | | B | | |
| |_____________| | | : | |_____________| | |
| NAME | | : | NAME | |
| _____________ | | : | _____________ | |
| | ____|_|_| : | | ____|_|_______________________|
| |_____________| | : | |_____________| |
| DESCRIPTION | : | DESCRIPTION |
| _____________ | : | _____________ |
| | ....|.|....: | | | |
| |_____________| | | |_____________| |
| VALUE | | VALUE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |_____________| |
| SIBLING | | SIBLING |
|_________________| |_________________| Figure 4-10
OBJECT OBJECT Effect of GET/STRUCT/MEMBER
_________________
| _____________ |
| | L | |
| |_____________| |
| NAME |
| _____________ |
| | LIST | |
| |_____________| |
| TYPE |
| _____________ |
| | | |
| |________|____| |
| CHILD | |
|__________|______|
DESCRIPTION |
|
__________V______
| _____________ |
| | M | |
| |_____________| |
| NAME |
| _____________ |
| | STRING | |
| |_____________| |
| TYPE |
| _____________ |
| | _________ | |
| | | FIXED | | |
| | |_________| | |
| | _________ | |
| | | 3 | | |
| | |_________| | |
| |_____________| |
| PARAMETERS |
|_________________|
DESCRIPTION
_________________
| _____________ |
| | R | |
| |_____________| |
| NAME |
| _____________ |
| | STRUCT | |
| |_____________| |
| TYPE |
| _____________ |
| | | |
| |_________|___| |
| CHILD | |
|___________|_____|
DESCRIPTION |
|
___________V_____
| _____________ |
| | A | |
| |_____________| |
| NAME |
| _____________ |
| | STRING | |
| |_____________| |
| TYPE | _________________
| _____________ | | _____________ |
| | | | | | B | |
| |_____________| | | |_____________| |
| PARAMETER | | NAME |
| _____________ | | _____________ |
| | ____|_|______\| | BOOL | |
| |_____________| | /| |_____________| |
| SIBLING | | TYPE |
|_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________
| |
| _____________ |
| | X | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
|
|
___________V_____
| |
| _____________ |
| | Z | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | OPD | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| |
/|____________|
OPD
_________________
| _____________ |
| | X | |
| |_____________| | _________________
| NAME | | _____________ |
| _____________ | | | DIR | |
| | ____|_|______\| |_____________| |
| |_____________| | /| TYPE |
| DESCRIPTION | |_________________|
| _____________ | DESCRIPTION
| | | |
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
___________V_____
| _____________ |
| | Y | |
| |_____________| | _________________
| NAME | | _____________ |
| _____________ | | | BOOL | |
| | ____|_|______\| |_____________| |
| |_____________| | /| TYPE |
| DESCRIPTION | |_________________|
| _____________ | DESCRIPTION
| | | |
| |_____________| |
| VALUE |
| _____________ |
| | ____|_|______________
| |_____________| | |
| SIBLING | |
|_________________| ______V__________ _________________
OBJECT | _____________ | | _____________ |
| | Z | | | | OPD | |
| |_____________| | __\| |_____________| |
| NAME | | /| TYPE |
| _____________ | | |_________________|
| | ____|_|___| DESCRIPTION
| |_____________| |
| DESCRIPTION |
| _____________ | _________________
| | ____|_|______\| |
Figure 4-14 | |_____________| | /|_________________|
X, Y, and Z after | VALUE | OPD
L/CREATE |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | F | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | LIST | |
| |_________|___| | | |_____________| |
| CHILD | | | TYPE |
|___________|_____| | _____________ |
OBJECT | | | | |
| | |___________|_| |
___________V_____ __\| CHILD | |
| _____________ | | /|_____________|___|
| | F | | | DESCRIPTION |
| |_____________| | | |
| NAME | | _____________V___
| _____________ | | | _____________ |
| | ____|_| | | | R | |
| |_____________| |___| | |_____________| |
| DESCRIPTION | | NAME |
| _____________ | | _____________ |
| | | | | | STRUCT | |
| |_________|___| | | |_____________| |
| VALUE | | | TYPE |
|___________|_____| | _____________ |
OBJECT | | | | |
| | |___________|_| |
___________V_____ | CHILD | |
| | |_____________|___|
| | DESCRIPTION |
|_________________| _____________V___
VALUE | _____________ |
| | A | |
| |_____________| |
| NAME | _________________
| _____________ | | _____________ |
| | STRING | | | | B | |
| |_____________| | | |_____________| |
| TYPE | | NAME |
| _____________ | | _____________ |
| | ____|_|_____\| | STRING | |
Figure 4-15 | |_____________| | /| |_____________| |
F immediately after | SIBLING | | TYPE |
creation |_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | OPF | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |_______|_____| |
| CHILD | | | VALUE | |
|___________|_____| |_________|_______|
OBJECT | OBJECT |
___________V_____ _________V______
| _____________ | | _____________ |
| | F | |/______|_|____ | |
| |_____________| |\ | |_____________| |
| NAME | | LIST |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |________|____| |
| VALUE | | | MEMBER | |
|___________|_____| |__________|______|
OBJECT | VALUE | OPD
| __________V______
___________V_____ | _____________ |
| | | | M | |
| LIS | | |_____________| |
|_________________| | NAME |
VALUE | _____________ |
| | | |
| |________|____| |
| CHILD | |
|__________|______|
OBJECT |
__________V______ _________________
| _____________ | | _____________ |
| | A | | | | B | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | ____|_|_____\| | | |
| |_____________| | /| |_____________| |
| SIBLING | | |
|_________________| |_________________|
OBJECT OBJECT
_________________ _________________
| _____________ | | _____________ |
| | M | | | | STRUC | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | |
| | VALUE | ____________V____
| | _____________ | | _____________ |
| | | | | | | STRING | |
| | |_________|___| | | |_____________| |
| | CHILD | | ___\| TYPE | _____________
| |___________|_____| | /| _____________ | | _________ |
| OBJECT | | | | ____|_|______\| | STRING | |
| | | | |_____________| | /| |_________| |
| ___________V_____ | | SIBLING | | TYPE |
| | _____________ | | |_________________| |_____________|
| | | A | | | DESCRIPTION DESCRIPTION A
| | |_____________| | | |
| | NAME | | _________________ |
| | _____________ | | | _____________ | |
| | | ____|_|__| | | B | | |
| | |_____________| | | |_____________| | |
| | DESCRIPTION | | NAME | |
| | _____________ | | _____________ | |
| | | | | | | ____|_|___________________|
| | |_____________| | | |_____________| |
| | VALUE | | DESCRIPTION |
| | _____________ | | _____________ |
| | | ____|_|______\| | | |
| | |_____________| | /| |_____________| |
| | SIBLING | | VALUE |
| |_________________| |_________________|
| OBJECT OBJECT
|___________________________
|
_____________________V____________________
| _____________ _____________ |
| | | | | |
| |_____________| |_____________| |
|__________________________________________| Figure 4-17
VALUE After L/OPEN/MEMBER
_________________ _________________
| _____________ | | _____________ |
| | M | | | | STRUC | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | |
| | VALUE | ____________V____
| | _____________ | | _____________ |
| | | | | | | STRING | |
| | |_________|___| | | |_____________| |
| | CHILD | | ___\| TYPE | _____________
| |___________|_____| | /| _____________ | | _________ |
| OBJECT | | | | ____|_|______\| | STRING | |
| | | | |_____________| | /| |_________| |
| ___________V_____ | | SIBLING | | TYPE |
| | _____________ | | |_________________| |_____________|
| | | A | | | DESCRIPTION DESCRIPTION A
| | |_____________| | | |
| | NAME | | _________________ |
| | _____________ | | | _____________ | |
| | | ____|_|__| | | B | | |
| | |_____________| | | |_____________| | |
| | DESCRIPTION | | NAME | |
| | _____________ | | _____________ | |
| __|_|____ | | | | ____|_|___________________|
| | | |_____________| | | |_____________| |
| | | VALUE | | DESCRIPTION |
| | | _____________ | | _____________ |
| | | | ____|_|______\| | | |
| | | |_____________| | /| |_____________| |
| | | SIBLING | | VALUE |
| | |_________________| |_________________|
| | OBJECT OBJECT
| |___________
| |
| ________|_________________________________
| | ______V______ _____________ |
|____\| | "AB" | | | |
/| |_____________| |_____________| |
|__________________________________________| Figure 4-18
VALUE After first L/ASSIGN
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | OPF | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |___________|_| |
| CHILD | | | VALUE | |
|___________|_____| |_____________|___|
OBJECT | OBJECT |
___________V_____ _____________V___
| _____________ | | _____________ |
| | F | |/______|_|____ | |
| |_____________| |\ | |_____________| |
| NAME | | LIST |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |___________|_| |
| VALUE | | | MEMBER | |
|___________|_____| |_____________|___|
OBJECT | VALUE | OPD
| _____________V___
______________V_________ | _____________ |
| ______________________ | | | M | |
|| _________ _________ || | |_____________| |
||| "AB" || "CD" ||| | NAME |
|||_________||_________||| | _____________ |
||______________________|| | | | |
| / | | |___________|_| |
| / | |_____________|___|
|_______________/________| OBJECT |
VALUE / / _____________V___ _________________
/ / | _____________ | | _____________ |
/ / | | | | | | B | |
/ LIST | |_____________| | | |_____________| |
/ | NAME | | NAME |
/ | _____________ | | _____________ |
NEW MEMBER VALUE | | ____|_|_____\| | | |
| |_____________| | /| |_____________| |
|_________________| |_________________|
OBJECT OBJECT
_________________
| _____________ |
| | F | |
| |_____________| |
| NAME |
| _____________ |
| | ____|_|_________\
| |_____________| | /
| DESCRIPTION |
| _____________ |
| | | |
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
|
_______________V______________
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "AB" | | "CD" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "EF" | | "GH" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "AB" | | "IJ" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "CD" | | "LM" | | |
| | |_________| |_________| | |
| |__________________________| |
|______________________________|
VALUE
------------------------------------
IMP(0) | pkt(0) | pkt(1) | ... | pkt(m-1) |
------------------------------------
| | ------------------------------------
IMP(1) | | | pkt(0) | pkt(1) | ... | pkt(m-1) |
| | ------------------------------------
| | | :
| | | :
| | | ------------------------------------
IMP(h-1)| | | | pkt(0) | pkt(1) | ... | pkt(m-1) |
|<------>| |<- ------------------------------------
\ \
\ `---> propagation delay from IMPO to IMPl
`--> packet transmission delay
__________________
| PDP-11 |
| SPEECH FRONT END |________
| 50.=62(8) | __|_________
|__________________| | |
__________________ | IMP-50 |________\ NCC-TIP
| PDP-10 | |____________| /
| SYSTEM D |________| | |
| 114.=162(8) | | |
|__________________| | |________________________
__________________ | |
| PDP-10 | | |
| SYSTEM A |________ | |
| 197.=305(8) | | | |
|__________________| | | |
__________________ __|___|_____ |
| PDP-11 | | | |
| LPT |_____| IMP-5 |________\ CCA |
| 69.=105(8) | |____________| / |
|__________________| | | |
__________________ | | |
| PDP-11 | | | |
| PACKET RADIO |________| | |
| 133.=205(8) | | |
|__________________| | |
__________________ | ________________________|
| PDP-10 | | |
| SYSTEM B |________ | |
| 49.=61(8) | __|___|___|_ ____________
|__________________| | 49 |_____| 161 |
__________________ | BBN10X-TIP | VDH | ANALOG TIP | Local
| PDP-10 | |____________| |____________| Terminals
| SYSTEM C |________|
| 241.=361(8) |
|__________________|
0-no TCB
\____________________________________________________________/
OPEN | A CLOSE CLOSE A
---------- | | ---------- ---------- |
set up TCB | | remove TCB remove TCB |
| | |
| | collision retry, |
SYN arrives __V____|__ SEND, INTER |
------------- / S1=0 \ ---------------- |
send SYN, ACK | S2=0 F=0 | send SYN |
______________________| R=0 C=0 |_____________________ |
| | U=0/1 | | |
| | | SYN arrives | |
| error,timeout | 1-OPEN | ----------- | |
| ------------- \__________/ collision; | |
| clear TCB A A set timeout | |
| _____________________| |_____________________ | |
__V____|__ _|___V__|_
/ S1=1 \ / S1=1 \
| S2=0 F=0 | | S2=0 F=0 |
| R=1 C=0 | SYN, ACK arrives | R=0 C=0 |
| U=0/1 | ACK arrives ---------------- | U=0 |
| | ----------- send ACK | |
| 3-SYN rcvd |_________________ _________________| 2-SYN sent |
\__________/ | | \__________/
| __V_____V__
| / S1=1 \
| CLOSE | S2=1 F=0 |
| -------- | R=1 C=0 | FIN arrives
| send FIN | U=0 | -------------------
| | | tell user, send FIN
| ________________|4-established|______________________
| | CLOSE \___________/ |
| | ------- |
__V_____V_ send FIN _______V__
/ S1=1 \ / S1=1 \
| S2=0/1 F=1 | timeout or | S2=1 F=1 |
| R=1 C=1 | FIN, error, arrives CLOSE | R=1 C=0 |
| U=0/1 | ------------------- ---------- | U=0 |
| | remove TCB remove TCB | |
| 5-FIN wait |_____________________ _____________| 6-FIN rcvd |
\__________/ | | \__________/
| |
____________________________V_____V_______________________
/ \
0-no TCB
| _____________ _______________ |
| | | | | |
| | | | INPUT PACKET |<---->|
| | REASSEMBLER | | HANDLER | |
| |_____________| |_______________| |
| |_______________ | |
| | | |
| _________ | | |
| | | __V_________V____ | NETWORK
|<=====| SYSTEM | | | | or
| | CALLS |<========| TCB's |<========| some
USERS |=====>| or | | and | | NETWORK
| | USER |========>|ASSOCIATED QUEUES|========>| INTERFACE
|<---->|INTERFACE| |_________________| | PROGRAM
| |_________| A A |
| | | |
| ______________| | |
| _______|_____ _______|_______ |
| | | | | |
| | PACKETIZER | | OUTPUT PACKET | |
| | | | HANDLER |<---->|
| |_____________| |_______________| |
| |
FIGURE 2.2a: ________
Address Check / Begin \
\________/
|
_V_
.' '.
.' packet '.
.' foreign '.
___________________.' socket matches '.
| no '. a TCB local .'
| '. socket .'
| '. ? .'
| '.___.'
| | yes
| _V_
| .' '.
| .' packet '. ___
| .'local socket '. / \
| .' matches fully '.____\| YES |
| '. specified TCB .' / \___/
| '.fgn socket .'
| '. ? .'
_V_ '.___.'
.' '. | no
.' SYN, '. _V_
.'FIN,INT,DSN, '. .' '.
_____.'or text length>0 './_____ .' matches '.
| no '. or QUERY .' \ | .'partly spec. '.
| '. .' |___.' or unspec. TCB '.
| '. ? .' no '. foreign .'
| '.___.' '. socket .'
| | yes '. ? .'
| __________V_________ '.___.'
| | | | yes
| | Create error 7 | _V_
| | packet. Signal OPH | .' '.
| |____________________| .' packet '.
| | ______.' has SYN set '.
| ____V____ | no '. .'
| | | | '. ? .'
|_________\| discard |/________| '.___.'
/|_________|\ |
| _V_
_V_ / \
/ \ | YES |
| NO | \___/
\___/
FIGURE 2.2b-1: _______
Input Packet Handler / Begin \
\_______/
|
________________________________________\|/_________________________
| A /|\ |
| | | |
| | _V_ |
| | .' '. _______ |
| | .' input '. | go to | |
| | .' packet '.____\| sleep | |
| | '.available.' no /|_______| |
| | '.__?__.' |
| | | yes |
| | _V_ |
| | .' '. |
| .->SPECIAL FUNCT. Fig 4.7 | .'address'. |
| | .->ERR Fig 4.5,4.6 |___.' check OK '. |
| | | .->SYN Fig 4.1,4.2 no '. ? .' |
| | | | .->INT Fig 4.3 '._____.' |
| | | | | .->FIN Fig 4.4 | yes ________|_
| | | | | | _V_ | discard |
| _|_|_|_|_|___________ .' '. |(or queue)|
| | | .' error '. |__________|
|<-| Control Processing |/_________.'or control '. A
|____________________|\ yes '. ? .' |
| '._____.' |
| (INT with data) | no |
| | |
V _V_ |
to "X" .' '. . |
in Fig 2.2b-2 .'(estab)'. .' '. |
_____.' R=S1=S2=1 '.----->.'seq.#'.--->|
| yes '. ? .' no '.OK .' no |
| '._____.' '.' |
| | yes |
| _______________ | |
| | Set S2=1, U=0 | V |
| | Notify user | .'. |
|<--| with event 2 | .'ACK'. |
| | if U was 1 |<-----'. OK .'--->'
| |_______________| yes '. .' no
| '
V
to "Y"
in Fig 2.2b-2
"Y"
|
.'. _V_
.'txt'. .' '. ______________________________
.'lgth>0 '. .'within '. |Use ACK to advance send window|
,<----'. or DSN .'<---'. window .'--->|Release ACK'ed packets from |
| no '. ? .' no '. ? .' yes |retransmit or send queues. If |
| '._.' '._.' |any packet had EB bit set |
| | yes |remove buffer from Packetized |
| ________V____________________ |buffer queue and inform user |
| |Create ACK packet. Put on | |(success). Signal Packetizer. |
|<-|Send packet queue. Signal OPH| |______________________________|
| |_____________________________| |
| |
| _____________________________________________|
| |
| |
| | "X"
| | |
| _V_ _V_ _____________________
| .' '. .'TCB'. |Put packet on |
| .' text '. yes .'Receive'. yes |Receive packet queue |
| .' length>0 '.-------->.' buffer '.------>|in the right order. |
| '. or DSN .' A '.available.' |Signal Reassembler. |
| '. ? .' | '. ? .' |_____________________|
| '._.' | '._.' |
| | no | | no |
| | | _V_ |
|________\| | .' '. |
/| | .' seq # '. ________ |
| | .' of packet '. yes |Discard | |
| | '. highest so .'---->|packet |----->|
| | '. far .' |________| |
| | '. ? .' |
| | '._.' |
| | | no |
| | _______V______________ |
| | |Discard packet with | |
| |_____|highest seq. no from | |
| |Receive packet queue. | |
| |______________________| |
| |
|_____________________________________________________|
|
V
to "Begin" in Fig 2.2b-1
_______
/ Begin \
\_______/
|
|
|<----------------------------------------------.
| _____ | yes
______V_____ .' '. _|_
|Get ready | .' Receive '. yes .'any'.
|for next TCB|--------->.'Packet Queue '.-------->.' more '.
|____________| A '. empty ? .' A '.work?.'
| '._______.' | '._.'
| | no | | no
"R"------>---------' __V__ | ____V____
.' is '. | | Go to |
.' packet '. | | Sleep |
.--<----------------------'.DSN with no.' | |_________|
| yes '. data? .' |
| '.___.' |
| | no |
| __V__ |
| .' '. |
| .' Receive '. yes |
| .'Buffer Queue '.--->|
| '. empty ? .' |
| ________________ '._______.' |
| |Copy from packet| | no |<-------------"S"
| |to buffer until | __V__ |
| |one is exhausted| .'First'. |
| |Update receive | yes .' packet '. no |
| |window. |<----.'matches Recv '.--->'
| |________________| '.left window.'
| | '. edge ?.'
| __V__ '.___.'
| .'Send '.
| .' Packet '. yes _____________________________
| .' Queue empty '.---->|Create ACK packet containing |
| '. ? .' |new window. Signal OPH. |
| '._______.' |_____________________________|
| no | |
| | |
| '--------------------------->|
| |
V V
to "T" to "U"
in Fig 2.3-2 in Fig 2.3-2
"T" "U"
| |
| | _____________
___V____ ___ __V__ |Mark progress|
|process | yes .' '. yes .'whole'. no |in packet. |
| DSN |<-----.' DSN '.<-----.' packet '.--->|Return buffer|--->.
|________| '. set?.' '.copied?.' |to user. | |
| '._.' '.___.' |_____________| |
| | no |
'--------------->| |
| |
__V__ __________________________ |
.' EOL '. yes |Return buffer to user. | |
'. set? .'--------->|Return packet to free |--->|
'.___.' |storage. Signal Packetizer| |
no | |__________________________| |
| A |
__V__ | |
.' full'. | |
'. buffer.'--------------' |
'.___.' yes |
| no |
| |
___________________V__________________ |
|Mark progress in buffer. Return packet| |
|to free storage. Signal Packetizer. | ,--------'
|______________________________________| |
| |
| |
V V
to "R" in Fig 2.3-1 to "S" in Fig 2.3-1
_______ ________________________
/ Begin \____________\| Get ready for next TCB |/___________________
\_______/ /|________________________|\ |
| |
__V__ _____ |
.'Send '. .' any '. |
no .' Buffer '. yes .' more '. yes |
.-------------'. Queue .'---->'. work .'-----'
| '.empty? .' A '. ? .'
____________V____________ '.___.' | '.___.'
|Pick packet size depend- | | | no
,-->|ing on send buffer, TCB | | ______V______
| |buffer space, window, etc| | | go to sleep |
| |_________________________| | |_____________|
| | |
| __V__ |
| .'Send '. |
| .' window '. no |
| '.has room ? .'--------------------->|
| '._______.' |
| | yes |
| __V__ |
| .' TCB '. |
| .' buffer '. no |
| .'space avail- '.---------------------'
| '. able ? .' A
| '._______.' |
| | yes |
| _____________V____________ _________|_______ ____________
| |Copy from Send buffer to | |Move buffer from | |Set EOL bit |
| |packet until packet full. | |Send queue to |<--|in packet |
| |Put packet on Send packet | |packetized queue | |header |
| |queue. Signal OPH. | |_________________| |____________|
| |__________________________| A A
| | | no |
| __V__ __|__ |
| .'whole'. .' EOL '. |
| .' Send '. yes .' set in '. yes |
| '. buffer .'----------->'. Send .'-----------'
| '.copied?.' '.buffer?.'
| '.___.' '.___.'
| | no
| _____________V__________
| |Note in TCB where in |
--|Send buffer we stopped. |
|________________________|
FIGURE 2.5a:
Output Packet Handler
_______
/ Begin \
\_______/
|
|<--------------------------.
____________V___________ |
| Get ready for next TCB | |
|________________________| |
| |
,------------------------------------>| |
| __V__ _____ |
| _____ .'Send '. .' any '. |
| yes .' ACK '. no .' Buffer '. yes .' more '. yes |
| .-----'.bit set.'<------'. Queue .'---->'. work .'-----'
| | '.___.' '.empty? .' A '. ? .'
| | no |________ '.___.' | '.___.'
| | |__________ | | no
| ____V__________________ | | |
| |Put latest receive left| ________v______ | ______V______
| |window edge in ACK. |->|Transmit packet| | | go to sleep |
| |_______________________| |_______________| | |_____________|
| | |
| ________________ __V__ |
| |Return packet to| .'pckt '. |_________________
| |buffer pool as | no .'seq # to '. |
| |it has been |<------.'rgt of Send '. |
| |ACKed | '.left window.' |
| |________________| '. edge .' |
| | '.___.' |
| | | yes |
| | _______________V________________ |
| | |Move packet to retransmit queue;| |
| | |set new retrans. time for it. | |
| | |________________________________| |
| | | |
| '---------------------->| |
| __V__ |
| no .'Time '. yes |
-------------------------------.'to switch'.---------------------'
'.TCB's? .'
'.___.'
_______
/ Begin \
\_______/
|
|<----------------------------------.
____________V___________ |
| Get ready for next TCB | |
|________________________| |
| |
.-------------------------------->| |
| __V__ |
| .' Any '. _____ |
| .'packet's '. .' any '. |
| .'retrans. time'. no .' more '. yes |
| '. has occurred .'----->'. work .'-----'
| '. for this .' '. ? .'
| '. TCB ? .' '.___.'
| '.___.' |
| | yes | no
| | ______V______
| ________V________ | go to sleep |
| |Move packet to | |_____________|
'------------------------|Send Packet |
|queue. Signal OPH|
|_________________|
FIGURE 3.1:
OPEN
_______
/ Begin \
\_______/
|
__V__
.'User '. _______
.'permitted'. no | |
.' access to '.---->|error 1|------------.
'.this local .' |_______| |
'.socket?.' |
'.___.' |
| yes |
__V__ |
.' fgn '. |
yes .' socket '. no |
.-----'. specified .'----. |
| '. ? .' | |
__V__ '.___.' __V__ _______ |
_______ .'conn-'. .'space'. no | | |
| | yes .' ection '. '.for TCB.'---->|error 4|-->|
,-|error 6|<----'. already .' '.___.' |_______| |
| |_______| '.exists?.' | yes |
| '.___.' | |
| | no ____V__________ |
| _______ __V__ |Create TCB. Set| |
| | | no .'space'. |S1=S2=R=F=C=1 | |
|<-|error 4|<-----'.for TCB.' |Set U=1 | |
| |_______| '.___.' |_______________| |
| | yes | |
| | | |
| _________V__________ | |
| |Create TCB. Set U=0 | | |
| |Set S1=S2=R=F=C=1 | | |
| |____________________| | |
| | | |
| '-------------.-------------' |
| | |
| _____________________V__________________ |
| |Return local connection name and Success| |
| |________________________________________| |
| | |
----------------------------------->|<--------------------------------'
____V___
/ Return \
\________/
FIGURE 3.2:
SEND
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
__V__ |
.'conn-'. _________ |
.' ection '. no | | |
.' open '.----------->| error 3 |---------->|
'. ? .' |_________| |
'._______.' |
| yes |
__V__ |
.' fgn '. _________ |
.' socket '. no | | |
'. specified .'------------>| error 5 |---------->|
'.(U=0)? .' |_________| |
'.___.' |
| yes |
__V__ |
.'conn-'. _________ |
.' ection '. yes | | |
'. closing ? .'------------>| error 12|---------->|
'.(F,C=1).' |_________| |
'.___.' |
| no |
____________________V________________________________ |
|Put buffer on Send Buffer queue and signal Packetizer| |
|_____________________________________________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
| |
| |
____________________V_________________________ |
|Return any pending Send buffers with code 10. | |
|Create INT packet on outgoing packet queue. | |
|Signal Output Packet Handler. | |
|______________________________________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.4:
RECEIVE
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
_V_ |
.' '. |
.' '. |
.'connection '. |
.' state '. |
:___________________: _________ |
| | | | | |
1-4 | 5,6 | 0 '-------------------->| error 3 |-->|
| '---------------------. |_________| |
__________V__________ | |
|Put buffer on Receive| | _________ |
|Buffer queue. Signal | | | | |
|Reassembler | '----->| error 12|-->|
|_____________________| |_________| |
| |
|<------------------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.5:
CLOSE
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
_V_ |
.' '. |
.' '. |
.'connection '. |
.' state '. |
:___________________: _________ |
5| |3,4 |1,2,6 |0 | | |
| | | '------------------>| error 3 |-->|
,------------' | '-------------------. |_________| |
| ______________V______________________ | |
| |Return all buffers to user with error| | ___________ |
| |12; clear all packet queues, create | | |Remove TCB | |
| |FIN packet, signal Output Packet | '--->|Return |--->|
| |Handler, set C=F=1 | |Success | |
| |_____________________________________| |___________| |
| | |
--------------------->|<----------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.6:
STATUS
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
__V__ __________ |
.'conn-'. |Return | |
.' ection '. no |state=0 or| |
'. open ? .'------------>|error 3 |--------->|
'._______.' |__________| |
| yes |
___________V___________ |
|Fill in reply from TCB.| |
|Return Success to user.| |
|_______________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
FIGURE 4.1:
SYN (no ACK)
_______
/ Begin \
\_______/
|
_V_
.' '.
.' '.
.' S1, S2, R '.
.' ? '.
:___________________: 1,1,1 _________
__________ | | | | (states 4-6) | |
|Treat as a| 1,0,1 | | | '------------->| error 6 |-->.
|duplicate.|<-----------' | | |_________| |
|Retransmit| | | 1.0,0 |
|SYN, ACK | 0,0,0 | | (Syn sent) ________________ |
|__________| (listening) | '------------>|Collision: Clear| |
| | |S1, set timeout,| |
| _____________________V________________ |remove SYN from |-->|
| |Set R=S1=1. If U=1 set foreign socket | |retransmit queue| |
| |in TCB to match packet local socket. | |________________| |
| |Send SYN, ACK. Signal OPH. Fill in TCB| |
| |with send window, receive sequence #. | |
| |______________________________________| |
| | |
| | |
'----------------------->|<---------------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
__V__
.' '.
.' State 2 '. no
'.S1=1;S2=R=0.'----------------.
'. ? .' |
'.___.' |
| yes |
__V__ _______V______
.' ACK '. no | |
.' correct '.-------->| send error 6 |
'. ? .' |______________|
'.___.' |
| yes |
_________V_________ |
|Set S2=R=1. Process| |
|ACK. Send ACK. | |
|___________________| |
| |
|<----------------------'
___V__
/ Done \
\______/
FIGURE 4.3:
INT (from net)
_______ ____________
/ Begin \____\|Process ACK |
\_______/ /|(may set S2)|------.
|____________| |
|
__V__
____________ .' in '.
| Discard | no .' state 4 '.
.<-------| (or queue) |<-------'. S1=S2=R=1 .'
| |____________| '. F=0 ? .'
| '.___.'
| | yes
| __V__
| ____________ .' '.
| | ACK and | no .' within '.
|<-------| discard |<-------'. window .'
| |____________| '. ? .'
| '.___.'
| | yes
| ____________________________V_______________
| |Move Receive Left window edge to sequence |
| |number of INT. Return event 10 with any |
| |pending Receive buffers. Ruturn event 11 to |
| |user. Send ACK for INT. |
| |____________________________________________|
| |
| __V__
| see yes .'data '.
| Figure<----------.' in this '.
| 2.2 '.packet?.'
| '.___.'
| | no
'------------------------------------>|
___V__
/ Done \
\______/
FIGURE 4.4:
FIN
_______ ____________
/ Begin \____\|Process ACK |
\_______/ /|(may set S2)|------.
|____________| |
|
__V__
.' '.
no .'S1=S2=R=1'.
.--------------'. (estab- .'
| '.lished).'
| '.___.'
| | yes
| __V__
______V_____ .' '.
| | no .' within '.
.-----------------| discard |<-------'. window .'
| |____________| '. ? .'
| '.___.'
| | yes
| __V__
| (state 4) 0 .'F bit'. 1 (state 5)
| .------------'. value .'------------.
| | '.___.' |
| _________________________V________ |
| |Return all user buffers (event 12)| _____________________V__
| |Clear all packet queues. Send FIN | |Return success to User's|
| |packet. Set F=1. Inform user | |CLOSE. Remove TCB. |
| |"connection closing" (event 12) | |________________________|
| |__________________________________| |
| | |
'----------------->|<-----------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
|
__V__
.' '.
.'refers to'.
.'current pckt?'. _________
.'(ACK matches seq '. no | |
'. # of packet on .'----------------->| discard |-----------.
'.retrans or send.' |_________| |
'. queues?) .' |
'._______.' |
| yes |
| |
_V_ |
.' '. 1 (state 3) |
.' value '.--------------------------------. |
'. of R.' bad SYN,ACK | |
'._.' | |
| | |
| 0 (state 2) | |
| bad SYN | |
__________________V__________________ _______V______ |
|Other side is established. Send RESET| |Clear S1, R | |
|(put error packet's seq. # in ACK | |Remove SYN,ACK| |
|field. Return all user buffers with | |from retrans | |
|code 14. Inform user with event 14 | |queue. | |
|_____________________________________| |______________| |
| | |
| V |
|<--------------------------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
__V__
.' '.
.'refers to'. _________
.' current '. no | |
'. packet (check .'---------------->| discard |-----------.
'. ACK)? .' A |_________| |
'._______.' | |
| yes | |
_V_ | |
.' '. | |
.' '. | |
.'connection '. | |
.' state '. | |
:___________________: | |
4| 5| 3| 2| 6| | |
.-------' | | | '------' |
| | | '-----------------------------. |
| | '-------------. | |
| | | | |
___V___ ____V_______ ______V_______ ________V_________ |
|Pass to| |Remove TCB. | |Clear S1, R. | |Discard. SYN will | |
|user | |Return | |Remove SYN,ACK| |be retrans to | |
|_______| |success to | |from transmit | |avoid receiver | |
| |user's CLOSE| |queue (go to | |having to queue it| |
| |____________| |state 1). | |__________________| |
| | |______________| | |
| V | V |
'------------------------------>|<---------------------------------'
___V__
/ Done \
\______/
FIGURE 4.7:
RESET
_______
/ Begin \
\_______/
|
__V__
no .'Reset'. yes
.------------'. All ? .'------------------.
| '.___.' |
| _________V_________
| |Clear all TCB's for|
| |foreign TCP. Inform|
| |users with event 14|
| |___________________|
__V__ |
.' Is '. _________ |
.' RESET '. no | | |
.'believable ? '.------->| discard |------------->|
'.(check ACK .' |_________| |
'.field) .' |
'.___.' |
| yes |
________________V________________ |
|Clear all queues for this TCB. | |
|Return event 14 for user buffers.| |
|Inform User with event 14. | |
|_________________________________| |
| |
|<----------------------------------------'
___V__
/ Done \
\______/
Limitations of Procedure Calling Across Machines___________ __ _________ _______ ______ ________
/ ------\ /-------\ /-----\
! !BEGIN(new index) ! ! ! !
! !->--------------->-!Index ! ! !
!Index !LISTEN(new index) !Open ! ! !
!Closed ! !Pending! !Index!
! ! REPLY(N)! !REPLY(A) !Open !
! !-<---------------<-! !->------->-! !
! ! \-------/ ! !
! ! ! !
! ! /-------\ END(Path=0)! !
! ! ! !-<-------------<-! !
! ! REPLY(A)!Index ! ! !
! !-<---------<-!Close !REPLY(N) ! !
! ! !Pending!->------------->-! !
\-------/ \-------/ \-----/
/------\BEGIN /----------\
! !->-------->-! !
! !LISTEN !Connection!
!Path ! !Pending !REPLY(A) /-------\
!Closed! REPLY(N)! !->------------>-! !
! !-<--------<-! ! ! !
! ! \----------/ !Path !
! ! !Conn- !
! ! /-----\ RESPONSE(CODE>0)! ecting!
! ! ! !-<-----------------<-! !
! ! !Path ! ! !
! ! REPLY(A)!Abort! END(PATH>0)! !
! !-<--------<-!Pend-!-<-----------------<-! !
! ! ! ing ! ! !
! ! ! !REPLY(N) ! !
\------/ ! !->----------------->-! !
\-----/ ! !
! !
/-------\ ! !
! ! RESPONSE(CODE=0)! !
/----\ !Path !-<--------------<-! !
! ! !Open ! ! !
!Path! !Pending!REPLY(N) ! !
!Open! REPLY(A)! !->-------------->-! !
! !-<--------<-! ! \-------/
\----/ \-------/
/----\MESSAGE /-------\ /-------\
! !->---------------->-! !REPLY(A+NR) ! !
!Path!INTERRUPT !Command!->--------->-!Message!
!Open! !Blocked!REPLY(N+NR) !Blocked!
! ! ! ! ! !
! ! REPLY(A+R)! ! INTERRUPT! !
! !-<----------------<-! !-<---------<-! !
! ! REPLY(N+R)\-------/ ! !
! ! REPLY(R)! !
! !-<----------------------<---------------<-! !
! ! ! !
! !END(PATH>0) /-------\ END(PATH>0)! !
! !->---------------->-! !-<---------<-! !
! ! ! ! ! !
! ! REPLY(N+R)!Path !REPLY(N) ! !
! !-<----------------<-!Close !->--------->-! !
\----/ !Pending! \-------/
! !
/------\ REPLY(A)! !
!Path !-<--------------<-! !
!Closed! ! !
! ! \-------/
\------/
An equivalent tree representation follows, for those
who prefer it.
start with high order bit
|
|
|
0-----0-----0-----0-----0-----0-----0-----0-----X
| | | | | | | | PADDING
0| 0| 0| 0| 0| 0| 0| 0|
| | | | | | | |
X | X | X | X X
CHAR7 | NON-ATOM | BITS | BOOL EMPTY
(7) | (5) | (3) | (1)
| 0| | |
SINTEGER | XTRA
(6) | (2)
LINTEGER
(3)
User User
\ /
\ /
\ /
--+----------------------------------------+-- Service
! \ / ! Interface
! +--------+ +--------+ !
! ! Module ! <--Protocol--> ! Module ! !
! +--------+ +--------+ !
! \ / !
! +-----------------------+ !
! ! Communication Service ! !
! +-----------------------+ !
! !
+----------------------------------------+
User User
\ /
\ /
\ /
+---------------------------------------------------------+
! \ / !
! +-----+ +-----+ +-----+ !
! ! MPM ! <--Protocol--> ! MPM ! <--Protocol--> ! MPM ! !
! +-----+ +-----+ +-----+ !
! ! / \ ! !
! +-----------------------+ +-----------------------+ !
! !Communication Service A! !Communication Service B! !
! +-----------------------+ +-----------------------+ !
! !
+---------------------------------------------------------+
+-----+ DATA +-----+
other-->! MPM !-->STRUCTURES-->! UIP !-->USER
MPMs +-----+ +-----+ +-----+
! !
! +-----+
+--! !
! +-----+
+--! !
! !
+-----+
+------------------------------------------------+
! !
! processing DATA DATA !
! routines ---> ENCODER ---> COMPRESSOR ---> !
! !
+------------------------------------------------+
Send MPM
+------------------------------------------------+
! !
! DATA DATA processing !
! ---> DECOMPRESSOR ---> DECODER ---> routines !
! !
+------------------------------------------------+
Receive MPM
+------+ +-----+ +-------+ +-----+ +-----+
!Telnet! ! FTP ! !Message! !Voice! ... ! ! Application Level
+------+ +-----+ +-------+ +-----+ +-----+
\ ! / ! !
+-----+ +-----+ +-----+
! TCP ! ! RTP ! ... ! ! Host Level
+-----+ +-----+ +-----+
! ! !
+-------------------------------+
! Internet Protocol ! Gateway Level
+-------------------------------+
!
+---------------------------+
! Local Network Protocol ! Network Level
+---------------------------+
!
+------+------+------+------+------
1 Padding ! 0 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+
4 Integer ! 4 ! Data !
+------+------+------+------+------+
+------+------+------+------+------
5 Bit String ! 5 ! bit count ! Data ...
+------+------+------+------+------
+------+------+------+------+------
6 Text String ! 6 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+------+-----
7 List ! 7 ! octet count ! item count ! Data
+------+------+------+------+------+------+-----
+------+------+------+------+------
8 Proplist ! 8 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+
! 8 ! octet ! pair !
! ! count ! count!
+------+------+------+------+------+
+------+------+------+---------+---------+
! name ! value ! name ! value !
repeated ! count! count ! ...! ...!
+------+------+------+---------+---------+
+-----------------------------------------------------------------+
! 1 2 !
! sending --> originating --> relay --> destination --> receiving !
! user MPM MPM MPM user !
! !
! 4 3 !
! originating <-- relay <-- destination !
! MPM MPM MPM !
+-----------------------------------------------------------------+
User User
\ /
UIP UIP
\ /
--+----------------------------------------+-- Service
| \ / | Interface
| +--------+ +--------+ |
| | Module | <--Protocol--> | Module | |
| +--------+ +--------+ |
| \ / |
| +-----------------------+ |
| | Communication Service | |
| +-----------------------+ |
| |
+----------------------------------------+
User User
\ /
UIP UIP
\ /
+---------------------------------------------------------+
| \ / |
| +-----+ +-----+ +-----+ |
| | MPM | <--Protocol--> | MPM | <--Protocol--> | MPM | |
| +-----+ +-----+ +-----+ |
| | / \ | |
| +-----------------------+ +-----------------------+ |
| |Communication Service A| |Communication Service B| |
| +-----------------------+ +-----------------------+ |
| |
+---------------------------------------------------------+
+-----+ DATA +-----+
other-->| MPM |-->STRUCTURES-->| UIP |-->USER
MPMs +-----+ +-----+ +-----+
| |
| +-----+
+--| |
| +-----+
+--| |
| |
+-----+
+------+ +-----+ +-------+ +-----+ +-----+
|Telnet| | FTP | |Message| |Voice| ... | | Application Level
+------+ +-----+ +-------+ +-----+ +-----+
\ | / | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
|
+------+ +-----+ +-------+
|Telnet| | FTP |---|Message| Application Level
+------+ +-----+ +-------+
\ /
+-----+ +-----+
|Voice|---| NCP | Host Level
+-----+ +-----+
|
|
| Gateway Level
|
|
+----------------+
| ARPA NET | Network Level
+----------------+
+------+------+------+------+------+------+
| 9 | octet count | item count |
+------+------+------+------+------+------+
+------+------/---+
repeated | element |
+------+------/---+
+-------+
|ENDLIST|
+-------+
+------+------+------+------+------+
| 10 | octet count | pair |
+------+------+------+------+------+
+------+------/---+------+------/---+
repeated | name element | value element |
+------+------/---+------+------/---+
+-------+
|ENDLIST|
+-------+
+------+------+------+------+------+------+------+------+
|11 - 9|01 - 9| <a> | 12 | 0 | 1 | <b> | 11 |
+------+------+------+------+------+------+------+------+
+------+------+------+------+------+------+------+
|10 - 9| <c> | 13 | 0 | 1 | 11 | 11 |
+------+------+------+------+------+------+------+
+-----------------------------------------------------------------+
| A B |
| sending --> originating --> relay --> destination --> receiving |
| user MPM MPM MPM user |
| |
| D C |
| originating <-- relay <-- destination |
| MPM MPM MPM |
+-----------------------------------------------------------------+
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | |
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | |
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol |
+-------------------------------+
|
+---------------------------+
| Local Network Protocol |
+---------------------------+
|
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | | Application Level
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
|
RCV.NXT RCV.NXT+RCV.WND
| |
---------XXX|XXX------XXXXXXXXXX---------XXX|XX---------
| | | | |
| | |
Segment 1 Segment 2 Segment 3
| Buffer 1 | Buffer 2
| |
----+-------------------------------+-----------------
XXXXXXXXXXXXXXXXXXXXX+++++++++++
| | |
|<-----SEG.LEN------>| |
| | |
| | |
SEG.SEQ A B
-------------
|/---------\|
|| User || --------
||Interface|<--->| User |
|\----:----/| --------
---------- | V |
|/------\| FTP Commands |/---------\|
||Server|<---------------->| User ||
|| PI || FTP Replies || PI ||
|\--:---/| |\----:----/|
| V | | V |
-------- |/------\| Data |/---------\| --------
| File |<--->|Server|<---------------->| User |<--->| File |
|System| || DTP || Connection || DTP || |System|
-------- |\------/| |\---------/| --------
---------- -------------
TELNET ------------ TELNET
---------->| User-FTP |<-----------
| | User-PI | |
| | "C" | |
V ------------ V
-------------- --------------
| Server-FTP | Data Connection | Server-FTP |
| "A" |<---------------------->| "B" |
-------------- Port (A) Port (B) --------------
3 +---+
----------->| E |
| +---+
|
+---+ cmd +---+ 2 +---+
| B |---------->| W |---------->| S |
+---+ --->+---+ +---+
| | |
| | | 4,5 +---+
| 1 | ----------->| F |
----- +---+
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
ftp (host) multics<CR> Connect to Host S, port L,
establishing TELNET connections
<---- 220 Service ready <CRLF>
username Doe <CR> USER Doe<CRLF>---->
<---- 331 User name ok,
need password<CRLF>
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 User logged in.<CRLF>
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for.pathname) test.pl1<CR> RETR test.pl1<CRLF> ---->
<---- 150 File status okay;
about to open data connection
Server makes data connection
to port U
<CRLF>
<---- 226 Closing data connection,
file transfer successful<CRLF>
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 450 Access denied<CRLF>
terminate QUIT <CRLF> ---->
Server closes all
connections.
0 1 2 3 length
+--------+--------+--------+--------+---//---+--------+--------+
| length | command| data |
+--------+--------+--------+--------+---//---+--------+--------+
------------ ------------
| | | | --------
| | MTP | |<-->| User |
| Receiver-|Commands/Replies| Sender- | --------
-------- | MTP |<-------------->| MTP | --------
| Mail |<-->| | Mail | |<-->| Mail |
|System| | | | | |System|
-------- ------------ ------------ --------
Old New
-+-+-+-+-+-----+---+--+---+--+-
...|M|A|I|L| ... |IAC|IP|IAC|DM|...
-+-+-+-+-+-----+---+--+---+--+-
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
AU1
|
AU0 | AU2
| | |
_______________
| |
| VT2 |
| |
| |
_______________
| _______________
| | |----AU0
|_______| VT0 |
|_______| |
| | |----AU1
| _______________
|
________________
| |
| |
| VT1 |
| |
________________
| | |
AU0 | AU2
|
AU1
___ ___ ___ ___
|VT1||VT2| |VT1||VT2|
____ _____ _____ ____
| | | |
__|_____|_________________|_____|__
| | | | | | | |
| REMOTE | -CONTROLLER-| REMOTE |
| KEYS | | DISPLAYS |
| | | |
| VIRTUAL | | DATA |
| KEYS | | STORE |
| |<----------->| |
| LOCAL | | LOCAL |
| KEYS | | DISPLAYS |
| | | |
__|_____|__________________|_____|__
| | | |
____ ____ _____ ____
|AU0||AU1| |AU0||AU1|
____ ____ _____ ____
| | |
| VIRTUAL TERMINAL | ADAPTATION UNIT |
|<------------------------------->|<--------------------------------->|
| DOMAIN | DOMAIN |
| | |
+ - - - - - - - - - + + - - - - - - - - - + - - - - - - - - -
| +---> x(m) | | | / /|
| | | | x(i) | / / |
| v y(m) | | +---------------> | - - - - - - - - - |
| | | | | | | +------------+ | |
| +--------------+ | | | | | | | VIEWPORT 1 | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | A<---------|--|-----|-|->A | | |
| | | | | | / \ | | | | | | |
| | <--------|--|---|-|-> \ | | | | | | |
| | / | | | | \ | | | | <---|-|--|+
| | A | | | | \ | | | +------------+ | ||
| | | | | | \ | | | | ||
| | WINDOW | | | | \ | | | +------------+ | ||
| | | | | | \ | | | | VIEWPORT 2 | | ||
| | | | | |-----------\--+ | | | | | ||
| | | | | | \ | | | | | ||
| +--------------+ | | v y(i) \ | | +------------+ | ||
| | | \ | | | / |
| | | \ | | | |
| | | \| - - - - - - - - |
| / | | / | | | |
+ - -/- - - - - - - + + - - -/- - - - - - +\ | | |
/ / \ - - - - - - - - |
/ / \ | KEYBOARD | |
MASTER WORKSPACE INSTANCE WORKSPACE \ + - - - - - - - + |
<-/ [] [] [] /| |
/ [] [] [] / | |
+ - - - - - - - - + |
|
PHYSICAL DEVICE WORKSPACE --+
+-----+ +-----+ +------+ +------+
| MTP | | MTP | | USER | |OTHER |
| TCP | | NCP | | MAIL | |MAIL |
| RCV | | RCV | | PGM | |SOURCE|
+-----+ +-----+ +------+ +------+
| | | |
| | | |
| | | |
v v v v
+----+ +----+ +----+ +----+
| | | | | | | |
Pending +----+ | +----+ | +----+ | +----+ |
Files | |-+ | |-+ | |-+ | |-+
| | | | | | | |
+----+ +----+ +----+ +----+
\ | | /
\ | | /
\ | | /
v v v v
+------------------+ TABLES
| | +----+
| DISPATCHER |<----->| |---+
| | | | |
+------------------+ +----+ |
/ / \ \ +----+
/ / \ \
/ / \ \
v v v v
+-----+ +-----+ +-------+ +-----+
| MTP | | MTP | | LOCAL | |OTHER|
| TCP | | NCP | |MAILBOX| |MAIL |
| SND | | SND | | FILES | |SINK |
+-----+ +-----+ +-------+ +-----+
User of (N)-services User of (N)-services
[an (N+1)-entity] [an (N+1)-entity]
\ /
\ /
\ /-----(N)-service-access-points-----\ / (N+1)
-----------o-------------------------------------o------------
\ / (N)
\<-----services provided to------>/
\ (N+1)-layer /
\ /
,------------, ,------------,
| | | |
| (N)-entity |<----"Peers"---->| (N)-entity | (N)-LAYER
| | | |
'------------' '------------'
\ /
\<----services required---->/
\ from (N-1)-layer /
\ / (N)
-------------------o---------------------o--------------------
\ / (N-1)
\ /
\ /
\ /
,--------------------------------,
| |
| |
| (N-1)-LAYER |
| |
| |
'--------------------------------'
(N)- | | (N)- | |
connect | |(N)-connect connect | | (N)-
------->| |indication ------->| | connect
request | | request | |indication
| |-------> | |------->
|(N)-LAYER | |(N)-LAYER |
(N)- | |<------- (N)- | |<-------
connect | | disconnect | | (N)-
<-------| |(N)-connect <-------| |disconnect
confirm | | response indication | | request
| | | |
(N)- | | (N)- | |
data | | (N)-data data | |
------->| |indication ------->| | (N)-
request | | request | | data
| |-------> | |indication
|(N)-LAYER | |(N)-LAYER |------->
| | (N)- | |
| | data | |
| | <-------| |
| | confirm | |
| | | |
(N)-dis | | | |
connect | | (N)- | | (N)-
------->|(N)-LAYER |(N)-disconnect disconnect|(N)-LAYER |disconnect
request | |indication <-------| |------->
| |-------> indication| |indication
| | | |
| |
(N)-data | |
request | |
--------->| |
| (N)-LAYER |
| |--------->
| | (N)-data
| | indication
| |
(N)-data | |
request | |
--------->| |
| | (N)-data
| (N)-LAYER |--------->
| | indication
<---------| |
(N)-data | |
confirm | |
,---------------------, ,---------------------,
| | | |
Level 7 | Application Layer |<---------->| Application Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 6 | Presentation Layer |<---------->| Presentation Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 5 | Session Layer |<---------->| Session Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 4 | Transport Layer |<---------->| Transport Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 3 | Network Layer |<---------->| Network Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 2 | Data Link Layer |<---------->| Data Link Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 1 | Physical Layer |<---------->| Physical Layer |
| | | |
'---------------------' '---------------------'
^ ^ (N+1)-LAYER
| |
| |
----------------o------------------------------o----------------
| |
,-------------------------, ,-------------------------,
| Offers a connectionless | | Offers a connection- |
| (N)-service | | oriented (N)-service |
| | | | | |
| (N)-LAYER | OR | (N)-LAYER |
| | | | | |
| Uses a connection- | | Uses a connectionless |
| oriented (N-1)-service | | (N-1)-service |
'-------------------------' '-------------------------'
| |
----------------o------------------------------o----------------
| |
| |
v v (N-1)-LAYER
^ ^ (N+1)-LAYER
| |
| |
----------------o------------------------------o----------------
| |
,-------------------------, ,-------------------------,
| Offers a connectionless | | Offers a connection- |
| (N)-service | | oriented (N)-service |
| | | | | |
| (N)-LAYER | OR | (N)-LAYER |
| | | | | |
| Uses a connectionless | | Uses a connection- |
| (N-1)-service | | oriented (N-1)-service |
'-------------------------' '-------------------------'
| |
----------------o------------------------------o----------------
| |
| |
v v (N-1)-LAYER
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | | TFTP| ... | ... |
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | UDP | ... | ... |
+-----+ +-----+ +-----+
| | |
+--------------------------+----+
| Internet Protocol & ICMP |
+--------------------------+----+
|
+---------------------------+
| Local Network Protocol |
+---------------------------+
+-------------------------------+
| Internet Protocol & ICMP & GGP|
+-------------------------------+
| |
+---------------+ +---------------+
| Local Net | | Local Net |
+---------------+ +---------------+
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | | Application Level
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol & ICMP | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
0100
------------------------>-----------------------------------
| |
| -------------------<------------------------------- |
| | 1 | |
| V | |
---------------- ----------------- | |
| | | | | |
| | 010 | | | |
|->| 2 |---------------------->| 1 |->| | |
| | | | | | | |
0| | B-W | 101 | W-B | |1 | |
|<-| |<----------------------| |<-| | |
| | | | | |
| | ----->| | | |
---------------- | ----------------- | |
| ^ | | | ^ | |
| | ------------>------| | | | | |
| | | 1 | | | | |
| | | | | | ^ V
| | | | | | | |
0111| |1 | | 1000| |1 | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | | 1011 | | | | |
| | | ----------<----------- | | | |
V | | | V | | |
---------------- | ----------------- | |
| |<--- | | | |
| | 0 | | | |
| 3 |<----------------------| 0 |------ |
| | | | |
| B-B | | W-W | |
| |---------------------->| |<---------
| | 0 | |
| | | |
---------------- -----------------
| ^ | ^
| | | |
------ ------
run run
Figure 1.
Non-deterministic finite-state machine diagram for RAPICOM 450
------------------------------------------------------------------
| 24-bit | 37-bit | 512-bit | 12-bit |
|sync code | header | data | checksum |
------------------------------------------------------------------
------------------------------------------------------------------
| 2-bit |5-bit| 10-bit | 12-bit | 3-bit | 3-bit |2-bit|
|seq num|flags|data count| x position|black size|white size|state|
------------------------------------------------------------------
+---------+ +---------+ +---------+
| | Telnet | | Telnet | |
| Local |<-------->| Relay |<-------->| Service |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | Telnet | | Telnet | |
| Local |<-------->| Relay |<-------->| Service |
| Host | NCP | Host | TCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | Telnet | | FTP | |
| Local |<-------->| Relay |<-------->| Service |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+
| | FTP | |
| Local |<-------->| Relay |
| Host | TCP | Host |
+---------+ +---------+
+---------+ +---------+ +---------+
| | SMTP | | SMTP | |
| Source |<-------->| Relay |<-------->| Dest. |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | SMTP | | FTP | |
| Source |<-------->| Relay |<-------->| Dest. |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | FTP | | SMTP | |
| Source |<-------->|Forwarder|<-------->| Dest. |
| Host | NCP | Host | TCP | Host |
+---------+ +---------+ +---------+
1 8 9 24
+----------------+---------------------------------+
| | |
| Host number | IMP number |
| | |
+----------------+---------------------------------+
1 16
+--------------------------------+
| |
| 1822L name |
| |
+--------------------------------+
1 2 3 8 9 16
+---+---+------------+----------------+
| | | | |
| 0 | 0 | host # | IMP number |
| | | | |
+---+---+------------+----------------+
Destination Host
Source
Host | 1822 on C/30 | 1822L | 1822 on non-C/30
--------+----------------+----------------+-----------------
| | |
1822 on | 1822 | 1822 | 1822
C/30 | | (note 1) |
| | |
--------+----------------+----------------+-----------------
| | |
| 1822L, using | 1822L, using | 1822L, using
1822L | 1822L name or | 1822L name or | 1822L address
|address (note 2)| address | only (note 2)
| | |
--------+----------------+----------------+-----------------
| | |
1822 on | 1822 | 1822 | 1822
non-C/30| | (note 1) |
| | |
--------+----------------+----------------+-----------------
| | |
----+----------+----------+----
... | x(1,j) | x(1,j+1) | ...
----+----------+----------+----
... | x(2,j) | x(2,j+1) | ...
----+----------+----------+----
| | |
Direction of scan ->
0100
.--------------------->----------------------------------.
| |
| .-----------------<------------------------------. |
| | 1 | |
| V | |
.--------------. .---------------. | |
| | | | | |
| | 010 | | | |
.->| 1 |-------------------->| 2 |->. | |
| | | | | | | |
0| | B-W | 101 | W-B | |1 | |
\<-| |<--------------------| |<-' | |
| | | | | |
| | .---->| | | |
\--------------' | \---------------' | |
| A | | | A | |
| | .--------->------' | | | | |
| | | 1 | | | | |
| | | | | | A V
| | | | | | | |
0111| |1 | | 1000| |1 | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | | 1011 | | | | |
| | | .-------<----------' | | | |
V | | | V | | |
.--------------. | .---------------. | |
| |<--' | | | |
| | 0 | | | |
| 3 |<--------------------| 0 |-----' |
| | | | |
| B-B | | W-W | |
| |-------------------->| |<--------'
| | 0 | |
| | | |
\--------------' \---------------'
| A | A
| | | |
\----' \----'
run run
.-----------. .-----------.
.-----| | | |-----.
| | 9 | | 6 | |
| .-| |<--. .-->| |-. |
| | \-----------' \ / \-----------' | |
1| 0| \ / |1 |0
| | .->Error \ / Error<-. | |
| | 0| \ / |1 | |
| | .-----------. \ / .-----------. | |
| 1 | | | \ / | | | 0 |
| .---| 7 | \ | 10 |---. |
| | | | | / \ | | | | |
| | | \-----------' / \ \-----------' | | |
| | | A / \ A | | |
| | | | / \ | | | |
| | | 1| / \ |0 | | |
| | | .-----------. 0 / \ 1 .-----------. | | |
| | | | |---' \---| | | | |
| | | | 5 | | 8 | | | |
| | | | | | | | | |
| | | \-----------' \-----------' | | |
| | | A A | | |
| | | | | | | |
| | | 1| |0 | | |
| | | .-----------. .-----------. | | |
| | ->| | | |<- | |
| | | 1 | | 2 | | |
| | | B-W |<-----. .----->| W-B | | |
| | \-----------' | | \-----------' | |
| | | A | | A | | |
| | | | |0 1| | | | |
| | \-----' | | \-----' | |
| | 0 .-----------. 0 | |
| | | | | |
| | | 4 | | |
| | RUN | | RUN | |
| | .-----. \-----------' .-----. | |
| | | | A A | | | |
| | | V | | V | | |
| | .-----------. 1 | | 1 .-----------. | |
| \-->| |------' 0 \------| |<--' |
| | 3 |<--------------------| 0 | |
\---->| B-B |-------------------->| W-W |<----'
\-----------' 0 \-----------'
+-----------+--------+-------------------+----------+
| Sync Code | Leader | Data | CRC Code |
+-----------+--------+-------------------+----------+
24 / 37 \ 512 12
.-------' \----------------------.
/ \
+-------+-------+-------+-------+-------+-------+
| Flags | Count | X Pos | Black | White | State |
+-------+-------+-------+-------+-------+-------+
| 7 \ 10 12 3 3 2
| \--------------------------.
| \
+-----+-----+------+-----+-------+-----+
| Seq | RUN | COFB | RPT | Spare | SUB |
+-----+-----+------+-----+-------+-----+
2 1 1 1 1 1
| |
| ************* |
********* ------> * Message * -------> *********
* User * Posting * Transfer * Delivery * User *
* Agent * Protocol * System * Protocol * Agent *
********* <------- ************* <------- *********
| |
| |
Posting Delivery
Slot Slot
Message Flow
Originator --------------------------------> Recipient
facsimile
machine
+---+ interface
! ! +--+ +-----+
! ! == ! ! == ! ! computer
+---+ +--+ +-----+
|
- - - - - - computer
/ \ network
\ / facsimile
- - - - - - machine
| interface +---+
+-----+ +--+ ! !
computer ! ! == ! ! == ! !
+-----+ +--+ +---+
fitter
+-------------+
+-- ! ! --+
| +-------------+ |
| | |
V V V
+-----+ +-----+ +-----+
! a ! ! b ! ! c !
+-----+ +-----+ +-----+
fitter
+-------------+
+-> ! * -> * -> * ! --+
| +-------------+ |
| | A |
| V | V
+-----+ +-----+ +-----+
! a ! ! b ! ! c !
+-----+ +-----+ +-----+
(0, 0)
+-------------------------------> x
|
| (x0, y0) w
| +--------------------+
| ! !
| ! !
| ! ! h
| ! !
| ! !
| +--------------------+
| (x1, y1)
V
y
|<--- header ---->|<------ 74 bytes ------->|
+--------+--------+-------------------------+
! length ! code ! DACOM block !
+--------+--------+-------------------------+
UCL facsimile
system - - - - - - - -
+--------+ / \ +------+
! ! ---- Cambridge Ring ---- ! PE !
+--------+ \ / +------+
- - - - - - - - |
/ \ |
+------+ +------+ |
! XG ! ! SG ! --- SATNET
+------+ +------+
/ \
PSS SERC NET
X A
|
| (511, 511)
511 +-------------------------------+
| |
| |
| |
| |
| (x, y) |
| + |
| |
| |
| |
| |
| |
+-------------------------------+----->
0 511 Y
(0, 0) width X
+-------------------------+---->
| |
| |
| (x0, y0) |
| +---------+ |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| +---------+ |
| (x1, y1) |
| |
| |
| |
| |
height +-------------------------+
|
|
Y V
(0, 0) width X
+-------------------------+---->
| |
| (x0, y0) |
| +---------+ |
| | | |
| | | |
| | | |
| | | |
| | | |
| +---------+ |
| (x1, y1) |
| |
| |
| (back ground) |
height +-------------------------+
|
|
Y V
+-------------------------+
| |
| upper |
| |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| left XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| width |
| |
+-------------------------+
start of the facsimile data
|
v
+---+------+---+------+-/
!EOL! DATA !EOL! DATA !
+---+------+---+------+-/
end of the facsimile data
|
v
/-+---+------+---+---+---+---+---+---+
!EOL! DATA !EOL!EOL!EOL!EOL!EOL!EOL!
/-+---+------+---+---+---+---+---+---+
|<------ RTC ------->|
start of the facsimile data
|
v
+----+--------+----+--------+-/
!EOL1!DATA(1D)!EOL0!DATA(2D)!
+----+--------+----+--------+-/
end of the facsimile data
|
v
/-+----+--------+----+----+----+----+----+----+
!EOL0!DATA(2D)!EOL1!EOL1!EOL1!EOL1!EOL1!EOL1!
/-+----+--------+----+----+----+----+----+----+
|<--------- RTC --------->|
+--------------+-----------------------------------------------+
|0| NET <-7-> | LOCAL ADDRESS <-24-> |
+--------------+-----------------------------------------------+
+---+--------------------------+-------------------------------+
|1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
+---+--------------------------+-------------------------------+
+-----+----------------------------------------+---------------+
|1 1 0| NET <-21-> | LOCAL ADDRESS |
+-----+----------------------------------------+---------------+
U
/ | \
/ | \ U -- Naming Universe
^ ^ ^ I -- Intermediate Domain
| | | E -- Endpoint Domain
I E I
/ \ |
^ ^ ^
| | |
E E I
/ | \
^ ^ ^
| | |
E E E
Application Application
Process Process
| |
SINS | |
-------|---------------------------------------------|----- Application
| AIP AIP | Interface
| | | | . . . . . . .
| DNS - - - DNS - - - DNS - - . . . - - DNS | Domain Name
----------------------------------------------------------- Service
Application Application
Process Process
| |
SINS | |
-------|---------------------------------------------|-------
| Endpoint Endpoint |
| DNS - - - DNS - - - DNS - - . . . - - DNS |
| |
-------------------------------------------------------------
naming
universe
/ \
--- ARPA (DNS)
/ |
/ SRI (DNS)
/ | \
USC (DNS) TSC (DNS/AIP)
| |
| [TCP/FTP/RFT]
ISI (DNS)
|
D (DNS/AIP)
/ \
[TCP/NIFTP/RFT] [TCP/FTP/RFT]
|
user
SATNET
(partitioned)
ARPANET/SATNET __ __ UCL
Gateway Simp ( \ \ ) Simp Gateway
____ ___( / / )____ ____
| B |__| S1 | \ \ | S2 |________| G |_____ rsre
|____| |____| / / |____| |____|
| ( \ \ ) |
| (__ / /__) _______|____
________|____ ( )
( ) ( )
( ARPANET ) ( UCL NET )
( ) ( )
(_____________) ( )
| | (_____________)
__|_ | VAN/ .
| H | | Public Data Nets .
|____| | _____________ .
Diagnostic | ( ) .
Host __|__ ( VANNET ) _.___
| VAN |* * (* * * * * * * * *)* * * * | |
| gw------(--- IP Tunnel -----)--------| U |
|_____|* * (* * * * * * * * *)* * * |_____|
VAN ( )
Gateway (_____________)
SATNET
(partitioned)
BBN __ __ UCL
Gateway Simp ( \ \ ) Simp Gateway
____ ___( / / )____ ____
| B |__| S1 | \ \ | S2 |________| G |_____ rsre
|____| |____| / / |____| |____|
| ( \ \ ) |
| (__ / /__) _______|____
________|____ ( )
( ) ( )
( ARPANET ) ( UCL NET )
( ) ( )
(_____________) ( )
| | (_____________)
__|_ | |
| H | | Public Data Nets |
|____| | _______________ _|___
Diagnostic | ( ) | M1 |
Host __|__ ( ) |:::::|
| VAN |* * (* * * * * * * * * *) * * |:::::|
| gw------(--- IP Tunnel -----)------------| M2 |
|_____|* * (* * * * * * * * * *) * * |_____|
VAN ( VANNET ) M
Gateway (_______________) "Header
Munger"
<----------------
\
Process 1 / Process 2
---------------->
One end echoes for itself
<----------------
\
Process 1 / Process 2
---------------->
One end echoes for the other
<----------------
\ /
Process 1 / \ Process 2
---------------->
Both ends echo for themselves
<----------------
\ /
Process 1 / \ Process 2
---------------->
One end echoes for both ends
PROCESS A TELNETconnection PROCESS B Terminal
+-----------+ +---------------+ Timing+-------+
| |WILL TIMING MARK| BUF 1 | Mark | |
| |<---------------|--|-|-|-|-|-|--|<------| |
| | | |-|-|-|-|-| | ^ | |
| | | BUF 2 | ^ | |
| |--------------->|--|-|-|-|-|-|--|------>| |
| | DO TIMING MARK | |-|-|-|-|-| | | |
+-----------+ +---------------+ +-------+
(NVT process).ME;
Figure 1
|
+------------------+------------------+
| | |
COLORS FLAVORS TRUTH
| |
+-----+-----+ |
| | | NATURAL
RED BLUE GREEN |
|
+---------------+---------------+
| | |
CHOCOLATE VANILLA STRAWBERRY
|
+------------------+------------------+
| | |
DDN ARPA CSNET
| | |
+-----+-----+ | +-----+-----+
| | | | | |
JCS ARMY NAVY | UDEL UCI
|
+--------+---------------+---------------+--------+
| | | | |
DTI MIT ISI UDEL NBS
| |
+---+---+ +---+---+
| | | | |
DMS AI A B F
|(B.ISI.ARPA)
|(UDEL.CSNET)
+------------------+------------------+
| | |
DDN ARPA CSNET
|(JCS.DDN) |(F.ISI.ARPA) |(UDEL.ARPA)
+-----+-----+ |(A.ISI.ARPA)+-----+-----+
| | | | | |
JCS ARMY NAVY | UDEL UCI
|
+--------+---------------+---------------+--------+
| | | | |
DTI MIT ISI UDEL NBS
|(AI.MIT.ARPA) |(F.ISI.ARPA)
+---+---+ +---+---+
| | | | |
DMS AI A B F
Local Host | Foreign
|
+---------+ +----------+ | +--------+
| | user queries | |queries | | |
| User |-------------->| |---------|->|Foreign |
| Program | | Resolver | | | Name |
| |<--------------| |<--------|--| Server |
| | user responses| |responses| | |
+---------+ +----------+ | +--------+
| A |
cache additions | | references |
V | |
+----------+ |
| database | |
+----------+ |
NSAP ------- NSAP -------
| (NSAP) | (NSAP)
| | | |
| |-------------------------|--------
| |
-----------------------------------
Octets 1 2 3 4 n n+1 p p+1
------------ -------------- -------------- --------
LI| | | | ... | | | .... | | | .... |
------------ -------------- -------------- --------
<--- Fixed Part -----><-- Variable Part->
(including checksum
where applicable)
+----+-------------------------------------------------+----+
| LH | data | TH |
+----+-------------------------------------------------+----+
^ ( ^ ) ^
+----------------+----------------+------~...~----------+
| TYPE | HEADER LENGTH | ORIGINAL HEADER(S) |
+----------------+----------------+------~...~----------+
20
A _______________ F
/ \ \
3 / \10\15
/ \ \
B/___5___\D \E
\ / /
\ / /
1 \ / /5
\/ /
C /
+-------+
| |---------------+---------------+
+---->| Idle | A A
| | |-----------+ | |
| +-------+ | | |
| | A Request | | Cease | Cease
| Start | | Cease | | |
| V | Refuse V | |
| +-------+ Confirm +-------+ Up +-------+
| | |-------->| |-------->| |
| | Aqsn | | Down | Down | Up |
| | |----+ | |<--------| |
| +-------+ | +-------+ +-------+
| | | |
| Stop | | |
| Cease-ack | Stop | Stop | Stop
| +-------+ | | |
| | | V V V
+-----| Cease |<---+--------+-----------------+
| |
+-------+
0 Idle 1 Aqsn 2 Down 3 Up 4 Cease
+-----------+-----------+-----------+-----------+-----------+
Up |0 |1 |3/Poll |3 |4 |
Down |0 |1 |2 |2 |4 |
Request |2/Confirm *|2/Confirm |2/Confirm |2/Confirm |4/Cease |
Confirm |0/Cease **|2 |2 |3 |4 |
Refuse |0/Cease **|0 |2 |3 |4 |
Cease |0/Cease-ack|0/Cease-ack|0/Cease-ack|0/Cease-ack|0/Cease-ack|
Cease-ack |0 |1 |2 |3 |0 |
Hello |0/Cease **|1 |2/I-H-U |3/I-H-U |4 |
I-H-U |0/Cease **|1 |2/Process |3/Process |4 |
Poll |0/Cease **|1 |2 |3/Update |4 |
Update |0/Cease **|1 |2 |3/Process |4 |
Start |1/Request |1/Request |1/Request |1/Request |4 |
Stop/t3 |0 |0 |4/Cease |4/Cease |0 |
t1 |0 |1/Request |2/Hello |3/Hello |4/Cease |
t2 |0 |1 |2 |3/Poll |4 |
+-----------+-----------+-----------+-----------+-----------+
Passive Gateway
Active 0 Idle 1 Aqsn 2 Down 3 Up 4 Cease
Gateway +-----------+-----------+-----------+-----------+-----------+
0 Idle |stable | | | |unstable |
1 Aqsn |unstable |unstable |unstable |unstable |unstable |
2 Down | | |stable |unstable | |
3 Up | | |unstable |stable | |
4 Cease |unstable |unstable |unstable |unstable |unstable |
+-----------+-----------+-----------+-----------+-----------+
# %
? * !
@ )
+------+ +-----+ +----+ $ = ^ +
| |Messages | |Segments | | Datagrams *
| User |<------->| RDP |<------->| IP |<-------> Internet
| | | | | | , ?
+------+ +-----+ +----+ ! )
* % $
@ ^ !
-------------------------------------------------
/ \
/ ARPANET \
\ 10 /
\ /
-------------------------------------------------
| | |
| | |
| | |
+-------------+ +-------------+ +---------------+
| ISI-PNG11 | | | | |
| Arpanet | | ISI-GATEWAY | | ISI-HOBGOBLIN |
| Address | | | | Vax 11/750 |
| logical | | Core EGP | | Unix 4.2 |
| multiplexer | | | | |
+-------------+ +-------------+ +---------------+
| | |
| | |
| | |
--------------- ----------------------------
/ \ / \
/ 3 Mb/s Ethernet \ / ISI-NET \
\ net 10 / \ 128.9 /
\ / \ /
--------------- ----------------------------
|
|
|
+--------------+
| ISI-TROLL |
| Vax 11/750 |
| Unix 4.1a |
| Non-routing |
| | |
| | 9600 | ISI-TROLL, UCI-750A
| | baud | and the link form a
| | link | single logical gateway
| | |
| UCI-750A |
| Vax 11/750 |
| Unix 4.2 |
+--------------+
|
|
|
----------------------
/ \
/ UCI-ICS \
\ 192.5.19 /
\ /
----------------------
______________OSI Network Service Definition______________
| ^
|
| |
Protocol Reference to aims __________|
|
Specification | Reference to assumptions ___
|
| |
|
| |
|
| v
______________Subnetwork Service Definition(s) ___________
Octet
+------------------------------------+
| Network Layer Protocol Identifier | 1
|------------------------------------|
| Length Indicator | 2
|------------------------------------|
| Version/Protocol Id Extension | 3
|------------------------------------|
| Lifetime | 4
|------------------------------------|
|S |M |E/R| Type | 5
| P| S| | |
|------------------------------------|
| Segment Length | 6,7
|------------------------------------|
| Checksum | 8,9
+------------------------------------+
Octet
+--------------------------------------+
| |
| Destination Address Length Indicator | 10
| |
|--------------------------------------|
| | 11
| Destination Address |
| | m-1
|--------------------------------------|
| |
| Source Address Length Indicator | m
| |
|--------------------------------------|
| | m+1
| Source Address |
| | n-1
+--------------------------------------+
Bits 8 7 6 5 4 3 2 1
+---------------------------------------------+
| Octet | Address parameter Length Indicator |
| n | (e.g., 'm') |
|---------------------------------------------|
| Octets | |
| n+1 | Address Parameter Value |
| thru | |
| n+m | |
+---------------------------------------------+
Octet
+------------------------+
| Data Unit Identifier | n,n+1
|------------------------|
| Segment Offset | n+2,n+3
|------------------------|
| Total Length | n+4,n+5
+------------------------+
BITS 8 7 6 5 4 3 2 1
+------------------------------------------+
| Octets | |
| n | Parameter Code |
|------------------------------------------|
| n+1 | Parameter Length (e.g., 'm') |
|------------------------------------------|
| n+2 | Parameter Value |
| n+m+1 | |
+------------------------------------------+
Octet
+--------------------------------------+
| Network Layer Protocol Identifier | 1
|--------------------------------------|
| Length Indicator | 2
|--------------------------------------|
| Version/Protocol Id Extension | 3
|--------------------------------------|
| Lifetime | 4
|--------------------------------------|
|SP|MS|E/R| Type | 5
|--------------------------------------|
| Segment Length | 6,7
|--------------------------------------|
| Checksum | 8,9
|--------------------------------------|
| Destination Address Length Indicator | 10
|--------------------------------------|
| Destination Address | 11 through m-1
|--------------------------------------|
| Source Address Length Indicator | m
|--------------------------------------|
| Source Address | m+1 through n-1
|--------------------------------------|
| Data Unit Identifier | n,n+1
|--------------------------------------|
| Segment Offset | n+2,n+3
|--------------------------------------|
| Total Length | n+4,n+5
|--------------------------------------|
| Options | n+6 through p
|--------------------------------------|
| Data | p+1 through z
+--------------------------------------+
Octet
+-----------------------------+
| Network Layer Protocol Id | 1
|-----------------------------|
| Data | 2 through n
+-----------------------------+
Octet
+--------------------------------------+
| Network Layer Protocol Identifier | 1
|--------------------------------------|
| Length Indicator | 2
|--------------------------------------|
| Version/Protocol Id Extension | 3
|--------------------------------------|
| Lifetime | 4
|--------------------------------------|
|SP|MS|E/R| Type | 5
|--------------------------------------|
| Segment Length | 6,7
|--------------------------------------|
| Checksum | 8,9
|--------------------------------------|
| Destination Address Length Indicator | 10
|--------------------------------------|
| Destination Address | 10 through m-1
|--------------------------------------|
| Source Address Length Indicator | m
|--------------------------------------|
| Source Address | m+1 through n-1
|--------------------------------------|
| Data Unit Identifier | n,n+1
|--------------------------------------|
| Segment Offset | n+2,n+3
|--------------------------------------|
| Total Length | n+4,n+5
|--------------------------------------|
| Options | n+6 through p-1
|--------------------------------------|
| Reason for Discard | p through q-1
|--------------------------------------|
| Error Report Data Field | z
+--------------------------------------+
+---------------------------------------------------------+
| Function | Send | Forward | Receive |
|---------------------------------------------------------|
| PDU Composition | M | - | - |
| PDU Decomposition | M | - | M |
| Header Format Analysis | - | M | M |
| PDU Lifetime Control | - | M | I |
| Route PDU | - | M | - |
| Forward PDU | M | M | - |
| Segment PDU | M | (note 1)| - |
| Reassemble PDU | - | I | M |
| Discard PDU | - | M | M |
| Error Reporting | - | M | M |
| PDU Header Error Detection | M | M | M |
| Padding |(note 2)| (note 2)| (note 2)|
| Security | - | (note 3)| (note 3)|
| Complete Source Routing | - | (note 3)| - |
| Partial Source Routing | - | (note 4)| - |
| Record Route | - | (note 4)| - |
| QoS Maintenance | - | (note 4)| - |
+---------------------------------------------------------+
+---------------------------------------------------------+
| KEY: |
| M : Mandatory Function; must be implemented |
| - : Not applicable |
| I : Implementation option, as described in text |
+---------------------------------------------------------+
| STATE |
-------+----------------------------------|
INPUT | CALL | NMBR | SIZE | XFER | EXIT |
-------+----------------------------------|
Greet | 2 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
#NNN | 1 | 3 | 1 | 1 | 6 |
-------+----------------------------------|
=CCC | 1 | 1 | 4 | 1 | 6 |
-------+----------------------------------|
data | 1 | 1 | 1 | 5 | 6 |
-------+----------------------------------|
+ Bye | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
Close | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
other | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
Timeout| 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
| STATE
-------+-----------------------------------------
INPUT | LSTN | AUTH | MBOX | ITEM | NEXT | DONE |
-------+-----------------------------------------|
Open | 2 | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
HELO | 1 | 3 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
FOLD | 1 | 1 | 5 | 5 | 1 | 1 |
-------+-----------------------------------------|
READ | 1 | 1 | 6 | 6 | 1 | 1 |
-------+-----------------------------------------|
RETR | 1 | 1 | 1 | 7 | 1 | 1 |
-------+-----------------------------------------|
ACKS | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
ACKD | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
NACK | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
QUIT | 1 | 4 | 4 | 4 | 1 | 1 |
-------+-----------------------------------------|
Close | 1 | 1 | 1 | 1 | 1 | 9 |
-------+-----------------------------------------|
other | 1 | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
Timeout| | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
0 7 8 15 16 31
+--------+--------+--------+--------+
| packet | port | sequence |
| type | number | number |
+--------+--------+--------+--------+
| length | checksum |
| | |
+-----------------+-----------------+
| |
| optional data octets |
+ . . . . . . . . . . . . . . . . . |
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000000|00000000|00000000 00000000|
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000001| unused | snd_una |
+--------+--------+--------+--------+
| 10 | checksum |
+-----------------+-----------------+
| rcv_nxt |
+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000010|port num| snd_nxt |
+--------+--------+--------+--------+
| length | checksum |
+-----------------+-----------------+
| data octet(s) |
+ . . . . . . . . . . . . . . . . . +
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000011|port num| rcv_nxt |
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000100|port num| rcv_nxt |
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
subnetwork point of
attachment identified
________ by SNPA
________________ | | /\
| | |______|/ \_______
| Real End | ____________ Layer | * <-/ |\-> * | Layer
| system, real | | | 3 |______| |______| 3
|subnetwork, or|____| Real | | | | |
| interworking | |Subnetwork| | | | |
| unit | ^ |__________| |______| |______|
|______________| |
|
subnetwork point of End Intermediate
attachment identified System System
by subnetwork address
layer 4
______________________________ 0 _____________________________
\
layer 3 \____NSAP identified
by NSAP address
**************
***** *****
*** ***
*** ***
** ** ** ** <-- Global
** * * .** network
** ** ** . ** addressing
* * * . * domain
* * * . . *
* * * .. . *
* * * .. + *
* * * .. <-----------\
** * * .. + ** |
* + * * ..+ * |
* + * <------------------------------\|
* + * * ... + * |
* + * * ... + * |
* + * * .... + * |
* + * * + * |
* + ************************************ * |
* ********* + + ********* * |
** + + ** |
* + + * |
** + + ** |
* + + <-------------\|
* + + * |
* + + * |
* + + * |
* + + * |
** + + ** |
** + <--\ + ** |
** + \ + ** |
*** + \ + *** |
*** \ *** |
***** \**** |
***************\ Network
\------------- addressing
subdomains
O
|
|
-------------------------------
| | | |
| | | |
----- ----- ----- -----
| W | | X | | Y | | Z |
----- ----- ----- -----
| | |
| | |
--------------- @ --------
| | | | |
| | | | |
----- ----- ----- ----- -----
| a | | b | | c | | a | | b |
----- ----- ----- ----- -----
|
|
----------------------
| | | |
| | | |
----- ----- ----- -----
| p | | q | | r | | s |
----- ----- ----- -----
**************
***** *****
*** ***
*** Z ***
** **
* *
*** ** ** ***
** ** * * ** **
** * ** ** * .**
** ** * * ** r . **
* * * * * . *
X * * * * * . ------------>* Y
* * * * * /. . s +*
* * * * * / .. + *
* * * * * / .. + *
** * * * * b .. + **
* + * * * * | ..+ *
* + * * * * | q + *
* + * ** * ..| + *
* + * * |... + a *
* + * * | p .... + *
* + * * V + *
* + ************************************ *
* ********* ********* *
** **
************************************
********* + + *********
** + + **
* + + *
** + + **
* + + c *
* a + + *
* + + *
* + b + *
* + + *
** + + **
** + + **
** + + **
*** + + ***
*** ***
***** *****
**************
W
NSAP Address Semantics------->Allocation by------->Abstract Syntax
|
|
|-->Representation in--->External
| Humanly-readable Reference
| Directories Syntax
|
|-->Encoding in--------->Concrete Syntax
Protocols
<----------------------NSAP ADDRESS------------------------->
___________________________________________________________
| | |
| IDP | DSP |
|___________|_______________________________________________|
:
:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
:
___________________________________________________________:
| | |
| AFI | IDI |
|___________|_______________________________________________|
___________________
| DSP Syntax |
|___________________|
| | |
__________| Decimal | Binary |
|IDI format| | |
|__________|_________|_________|
| X.121 36 37 |
|______________________________|
| ISO DCC 38 39 |
|______________________________|
| F.69 40 41 |
|______________________________|
| E.163 42 43 |
|______________________________|
| E.164 44 45 |_____________________
|______________________________|Character | National |
|ISO 6523-ICD 46 47 |(ISO 646) |Character |
|______________________________|__________|__________|
| Local 48 49 50 51 |
|____________________________________________________|
___________________
| DSP Syntax |
|___________________|
| | |
__________| Decimal | Binary |
|IDI format| | |
|__________|_________|_________|
| X.121 24 9 |
|______________________________|
| ISO DCC 35 14 |
|______________________________|
| F.69 30 12 |
|______________________________|
| E.163 26 10 |
|______________________________|
| E.164 23 9 |_____________________
|______________________________|Character | National |
|ISO 6523-ICD 34 13 |(ISO 646) |Character |
|______________________________|__________|__________|
| Local 38 15 19 7 |
|____________________________________________________|
_____________________________
| \ a | | | |
| d \ | 0 | 1 | 2 |
|____\___|______|______|______|
| 0 0 1 2 |
|_____________________________|
| 1 3 4 5 |
|_____________________________|
| 2 6 7 8 |
|_____________________________|
________________________________________________________________
| | DSP Abstract | Binary DSP | Decimal DSP |
| IDI Format | syntax | concrete syntax concrete syntax|
|_____________|_______________|_________________|______________|
| | Decimal | 20 octets | 40 digits |
| X.121 | Binary | 17 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| ISO DCC | Binary | 17 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| F.69 | Binary | 17 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| E.163 | Binary | 17 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| E.164 | Binary | 18 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| ISO 6523-ICD| Binary | 16 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| LOCAL | Binary | 16 octets | 40 digits |
| | Character | 20 octets | 40 digits |
| |National Char. | 15 octets | 37 digits |
|_____________|_______________|_________________|______________|
+-+------------+--------------+--------------+--------------+
|0| NET <-7-> | LOCAL ADDRESS <-24-> |
+-+------------+--------------+--------------+--------------+
+---+----------+--------------+--------------+--------------+
|1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
+---+----------+--------------+--------------+--------------+
+-----+--------+--------------+--------------+--------------+
|1 1 0| NET <-21-> | LOCAL ADDRESS|
+-----+--------+--------------+--------------+--------------+
+-+------------+--------------+--------------+--------------+
|0| 10 or 26 | HOST | LOGICAL HOST | PSN (IMP) |
+-+------------+--------------+--------------+--------------+
0 16 32
+---------------+---------------+---------------+
| | | |
+---------------+---------------+---------------+
A
decimal point
0 16
+---------------+---------------+
| | |
+---------------+---------------+
A
decimal point
-------------
|/---------\|
|| User || --------
||Interface|<--->| User |
|\----^----/| --------
---------- | | |
|/------\| FTP Commands |/----V----\|
||Server|<---------------->| User ||
|| PI || FTP Replies || PI ||
|\--^---/| |\----^----/|
| | | | | |
-------- |/--V---\| Data |/----V----\| --------
| File |<--->|Server|<---------------->| User |<--->| File |
|System| || DTP || Connection || DTP || |System|
-------- |\------/| |\---------/| --------
---------- -------------
Control ------------ Control
---------->| User-FTP |<-----------
| | User-PI | |
| | "C" | |
V ------------ V
-------------- --------------
| Server-FTP | Data Connection | Server-FTP |
| "A" |<---------------------->| "B" |
-------------- Port (A) Port (B) --------------
+----------------+----------------+----------------+
| Descriptor | Byte Count |
| 8 bits | 16 bits |
+----------------+----------------+----------------+
+--------+--------+--------+
|Descrptr| Byte count |
|code= 16| = 6 |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
3 +---+
----------->| E |
| +---+
|
+---+ cmd +---+ 2 +---+
| B |---------->| W |---------->| S |
+---+ --->+---+ +---+
| | |
| | | 4,5 +---+
| 1 | ----------->| F |
----- +---+
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
ftp (host) multics<CR> Connect to host S, port L,
establishing control connections.
<---- 220 Service ready <CRLF>.
username Doe <CR> USER Doe<CRLF>---->
<---- 331 User name ok,
need password<CRLF>.
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 User logged in<CRLF>.
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for. pathname) test.pl1<CR> RETR test.pl1<CRLF> ---->
<---- 150 File status okay;
about to open data
connection<CRLF>.
Server makes data connection
to port U.
<---- 226 Closing data connection,
file transfer successful<CRLF>.
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 550 Access denied<CRLF>
terminate QUIT <CRLF> ---->
Server closes all
connections.
________________________________________________________
check- SNP TTL where a reass ICMP
sum params valid to frag done check-
valid? valid? ? ? ? ? sum?
__________________________________________________________________
YES YES YES ULP YES YES d reass_
delivery;
state :=
INACTIVE
__________________________________________________________________
________________________________________________________
check- SNP TTL where a reass ICMP
sum params valid to frag done check-
valid? valid? ? ? ? ? sum?
__________________________________________________________________
YES YES YES ULP YES YES d reassemble;
reass_
delivery;
state :=
INACTIVE
__________________________________________________________________
________________________________________________________
check- SNP TTL where a reass ICMP
sum params valid to frag done check-
valid? valid? ? ? ? ? sum?
__________________________________________________________________
YES YES YES ICMP YES NO d reassemble;
__________________________________________________________________
________________________________________________________
check- SNP TTL where a reass ICMP
sum params valid to frag done check-
valid? valid? ? ? ? ? sum?
__________________________________________________________________
YES YES YES ICMP YES YES d reassemble;
analyze;
state :=
INACTIVE
__________________________________________________________________
DEACTIVATE WORKSTATION (GKSM-OUT) disable output
CLEAR WORKSTATION (GKSM-OUT,...) 1
2
REDRAW ALL SEGMENTS ON WORKSTATION (GKSM-OUT)
UPDATE WORKSTATION (GKSM-OUT,...) 3
SET DEFERRAL STATE (GKSM-OUT,...) 4
MESSAGE (GKSM-OUT,...) 5 (message)
ESCAPE 6
________________________________________________________________________
POLYLINE 11
POLYMARKER 12
TEXT 13
FILL AREA 14
CELL ARRAY 15
GENERALIZED DRAWING PRIMITIVE 16
________________________________________________________________________
SET ASPECT SOURCE FLAGS 43
SET PICK IDENTIFIER 44
________________________________________________________________________
INSERT SEGMENT (21-44), (11-16), (61)
________________________________________________________________________
SET VISIBILITY 92
SET HIGHLIGHTING 93
SET SEGMENT PRIORITY 94
SET DETECTABILITY 95
________________________________________________________________________
WRITE ITEM TO GKSM > 100
________________________________________________________________________
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
END | End-of- | ENDLIST | End-of- | -- | --
| Contents | (11) | Constructor| |
| (0) | | (1) | |
| | | | |
PAD | Null (5) | NOP (0) | No-Op (0) | -- | --
| | PAD (1) | Padding | |
| | | (33) | |
| | | | |
RECORD | Set (17) | PROPLIST | Set (11) | -- | --
| | (14) | | |
| Sequence | LIST (9) | Sequence | Sequence | Structure
| (16) | | (10) | |
| | | | Record |
| | | Message | |
| | | (77) | |
| -- | -- | -- | Array | Fixed Array
| | | | | Counted Array
| "Choice" | -- | -- | Choice |Discriminated-
| "Any" | | | | Union
| | | | |
| "Tagged" | "name" | Field (76) | -- | --
| | |Unique-ID(9)| |
| -- | SHARE-TAG | -- | -- | --
| | (12) | | |
| | SHARE-REF | | |
| | (13) | | |
| | | | |
| -- | -- | Compressed | -- | --
| | | (70) | |
| -- | ENCRYPT | Encrypted | -- | --
| | (14) | (71) | |
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
BOOLEAN| Boolean(1)| BOOLEAN(2)| Boolean(8) | Boolean | Boolean
| | | | |
NUMBER | Integer(2)| EPI (5) | Integer(32)| Integer | Integer
| SV | SV | SV | S16 | S32
| | INDEX (3) | | Cardinal | Unsigned Int
| | U16 | | U16 | U32
| | INTEGER(4)| |Unspecified|Enumeration
| | S32 | | 16 | 32
| | | | Long Int |Hyper Integer
| | | | S32 | S64
| | | | Long Card |Uns Hyper Int
| | | | U32 | U64
| | | | | Double Prec
| | | | | 64
| -- | FLOAT (15)| -- | -- | Float Pt
| | 64 | | | 32
| | | | |
BIT- | Bit String| BITSTR(6) | Bit-String | -- | --
STRING| (3) | | (67) | |
| Octet- | -- | -- | -- | Opaque
| String(4)| | | |
| | | | |
STRING | IA5 (22) | TEXT (8) | ASCII- | String | Counted-
| | | String (2)| | Byte String
| | NAME (7) | | |
| Numeric | | | |
| (18) | | | |
| Printable | | | |
| (19) | | | |
| T.61 (20) | | | |
| Videotex | | | |
| (21) | | | |
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
OTHER | UTC Time | -- | Date (40) | -- | --
| (23) | | | |
| Gen Time | | | |
| (24) | | | |
| -- | -- | Property- | -- | --
| | | List (36)| |
| -- | -- |Property(69)| -- | --
| | | | |
| -- | -- | -- | Procedure | --
| | | | |
| -- | -- | Vendor- | -- | --
| | | Defined | |
| | | (127) | |
| | | Extension | |
| | | (126) | |
+---------------------------+---------------------------+
I I I
I I D P I D S P I
I I I
+---------------------------+---------------------------+
: :
: :
V V
+-----+---------------------+
I I I
I AFI I I D I I
I I I
+-----+---------------------+
+-------------+ +-------------+
| TS-user | | TS-user |
+-------------+ +-------------+
| |
| TSAP interface TSAP interface |
| [ISO-8072] |
| |
+------------+ ISO Transport Services on the TCP +------------+
| client |----------------------------------------| server |
+------------+ (this memo) +------------+
| |
| TCP interface TCP interface |
| [RFC-793] |
| |
Octet
+--------------------------------------+ +--------
| Network Layer Protocol Identifier | 1 :
|--------------------------------------| :
| Length Indicator | 2 :
|--------------------------------------| :
| Version/Protocol Id Extension | 3 : Fixed
|--------------------------------------| :
| Lifetime | 4 : Part
|--------------------------------------| :
|SP|MS|E/R| Type | 5 :
|--------------------------------------| :
| Segment Length | 6,7 :
|--------------------------------------| :
| Checksum | 8,9 :
|--------------------------------------| +--------
| Destination Address Length Indicator | 10 :
|--------------------------------------| :
| Destination Address | 11 through m-1 : Address
|--------------------------------------| :
| Source Address Length Indicator | m : Part
|--------------------------------------| :
| Source Address | m+1 through n-1 :
|--------------------------------------| +--------
| Data Unit Identifier | n,n+1 :
|--------------------------------------| : Segment
| Segment Offset | n+2,n+3 : ation
|--------------------------------------| :
| Total Length | n+4,n+5 : Part
|--------------------------------------| +--------
| Options | n+6 through p : Options
Part
|--------------------------------------| +--------
| Data | p+1 through z : Data
+--------------------------------------+ +--------
| |
| Upper-Layer Protocol Modules |
|__________________________________________________________|
--------------------- IP Service Interface -----------------------
__________________________________________________________
| | | |
| | ICMP | IGMP |
| IP |______________|______________|
| Module |
| |
|__________________________________________________________|
---------------- Local Network Service Interface -----------------
__________________________________________________________
| | |
| Local | IP-to-local address mapping |
| Network | (e.g. ARP) |
| Modules |_____________________________|
| (e.g. Ethernet) |
| |
...--------+--------+--------+
MAC Header| Length | 802.{3/4/5} MAC
...--------+--------+--------+
+--------+--------+--------+
| Dsap=K1| Ssap=K1| control| 802.2 SAP
+--------+--------+--------+
+--------+--------+---------+--------+--------+
|protocol id or org code =K2| Ether Type | 802.2 SNAP
+--------+--------+---------+--------+--------+
...--------+--------+--------+
MAC Header| Length | 802.{3/4/5} MAC
...--------+--------+--------+
+--------+--------+--------+
| Dsap=K1| Ssap=K1| control| 802.2 SAP
+--------+--------+--------+
+--------+--------+---------+--------+--------+
|protocol id or org code =K2| Ether Type | 802.2 SNAP
+--------+--------+---------+--------+--------+
______________________________________________________________________
| |
| ISO/TC 97/SC 6 |
| TELECOMMUNICATIONS AND INFORMATION |
| EXCHANGE BETWEEN SYSTEMS |
| Secretariat: USA (ANSI) |
| |
| |
|_____________________________________________________________________|
--------------------+--- ISO NETWORK SERVICE PROVIDER -----^-----------------
| |
| |
| |
PROTOCOL | REFERENCE TO AIMS -----------------+
|
SPECIFICATION | REFERENCE TO ASSUMPTIONS -----------+
| |
| |
| |
--------------------+---SUBNETWORK SERVICE DEFINITION(S)---v-----------------
_____________________________________________________________
| PRIMITIVES PARAMETERS |
|____________________________________________________________ |
| N_UNITDATA .Request | N_Source_Address, |
| .Indication | N_Destination_Address, |
| | N_Quality_of_Service, |
| | N_Userdata |
|_________________________________|___________________________|
_____________________________________________________________
| PRIMITIVES PARAMETERS |
|____________________________________________________________ |
| SN_UNITDATA .Request | SN_Source_Address, |
| .Indication | SN_Destination_Address, |
| | SN_Quality_of_Service, |
| | SN_Userdata |
|_________________________________|___________________________|
__________________________________________________
| PRIMITIVES PARAMETERS |
|_________________________________________________|
| S--TIMER .Request | S-Time, |
| | S-Name, |
| | S-Subscript |
| | |
| .Response | S-Name, |
| | S-Subscript |
|___________________________|_____________________|
_____________________________________________________________________________
| | FULL | NON | INACTIVE |
| FUNCTION | PROTOCOL | SEGMENTING | SUBSET |
| | | SUBSET | |
|________________________________|_____________|_________________|____________|
|PDU Composition | 1 | 1 | 1 |
|PDU Composition | 1 | 1 | 1 |
|Header Format Analysis | 1 | 1 | 1 |
|PDU Lifetime Control | 1 | 1 | N/A |
|Route PDU | 1 | 1 | N/A |
|Forward PDU | 1 | 1 | N/A |
|Segment PDU | 1 | N/A | N/A |
|Reassemble PDU | 1 | N/A | N/A |
|Discard PDU | 1 | 1 | N/A |
|Error Reporting (Note 1) | 1 | 1 | N/A |
|Header Error Detection (Note 1) | 1 | 1 | N/A |
|Security | 1 | 2 | N/A |
|Complete Source Routing | 1 | 2 | N/A |
|Complete Route Recording | 2 | 2 | N/A |
|Partial Source Routing | 3 | 3 | N/A |
|Partial Route Recording | 3 | 3 | N/A |
|Priority | 3 | 3 | N/A |
|QoS Maintenance | 3 | 3 | N/A |
|Congestion Notification | 3 | 3 | N/A |
|Padding | 3 | 3 | N/A |
|________________________________|_____________|_________________|____________|
Part Described in
___________________________________
| Fixed Part | Section 7.2
|_________________________________|
| Address Part | Section 7.3
|_________________________________|
| Segmentation Part | Section 7.4
|_________________________________|
| Options Part | Section 7.5
|_________________________________|
| Data | Section 7.6
|_________________________________|
Octet
________________________________________
| Network Layer Protocol Identifier | 1
|______________________________________|
| Length Indicator | 2
|______________________________________|
| Version/Protocol Id Extension | 3
|______________________________________|
| Lifetime | 4
|______________________________________|
| SP vline M S vline e/R | Type | 5
|______________________________________|
| Segment Length | 6,7
|______________________________________|
| Checksum | 8,9
|______________________________________|
__________________________________________________
| | Bits 5 4 3 2 1 |
|_________|______________________________________|
| DT PDU | 1 1 1 0 0 |
|_________|______________________________________|
| ER PDU | 0 0 0 0 1 |
|_________|______________________________________|
Octet
____________________________________________
| Destination Address Length Indicator | 10
|___________________________________________|
| | 11
: Destination Address :
| | m - 1
|___________________________________________|
| Source Address Length Indicator | m
|___________________________________________|
| | m + 1
: Source Address :
| | n - 1
|___________________________________________|
______________________________________________
| Octet | Address parameter Length Indicator |
| n | (e.g., 'm') |
|________|____________________________________|
| Octets | |
| n + 1 | Address Parameter Value |
| thru | |
| n + m | |
|________|____________________________________|
Octet
________________________
| Data Unit Identifier | n, n + 1
|______________________|
| Segment Offset | n + 2, n + 3
|______________________|
| Total Length | n + 4, n + 5
|______________________|
Octet
___________________________________________________
| | n + 6
: Options :
| | p
|__________________________________________________|
Octets
___________________________________________
| n | Parameter Code |
|____________|____________________________|
| n + 1 | Parameter Length (e.g.m) |
|____________|____________________________|
| n + 2 | |
| to | Parameter Value |
| n + m + 1 | |
|____________|____________________________|
Octet
___________________________________________________
| | p + 1
: Data :
| | z
|__________________________________________________|
__________________________________________
| Network Layer Protocol Identifier | 1
|________________________________________|
| Length Indicator | 2
|________________________________________|
| Version/Protocol Id Extension | 3
|________________________________________|
| Lifetime | 4
|________________________________________|
| S P vline M S vline e/R | Type | 5
|____________________________|___________|
| Segment Length | 6,7
|________________________________________|
| Checksum | 8,9
|________________________________________|
| Destination Address Length Indicator | 10
|________________________________________|
| | 11
: Destination Address :
|________________________________________| m - 1
| Source Address Length Indicator | m
|________________________________________|
| | m + 1
: Source Address :
| | n - 1
|________________________________________|
| Data Unit Identifier | n, n + 1
|________________________________________|
| Segment Offset | n + 2, n + 3
|________________________________________|
| Total Length | n + 4, n + 5
|________________________________________|
| | n + 6
| Options |
| | p
|________________________________________|
| | p + 1
| Data |
| | z
|________________________________________|
Octet
____________________________________
|Network Layer Protocol Identifier | 1
|__________________________________|
| | 2
| Data |
| | 2 - n
|__________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|____________________________________________|
| Length Indicator | 2
|____________________________________________|
| Version/Protocol Id Extension | 3
|____________________________________________|
| Lifetime | 4
|____________________________________________|
| SP= 0 vline MS= 0 vline Reserved | Type | 5
|_____________________________________|______|
| Segment Length | 6,7
|____________________________________________|
| Checksum | 8,9
|____________________________________________|
| Destination Address Length Indicator | 10
|____________________________________________|
| | 11
: Destination Address :
| | m - 1
|____________________________________________|
| Source Address Length Indicator | m
|____________________________________________|
| | m + 1
: Source Address :
| | n - 1
|____________________________________________|
| | n
| Options |
| | p - 1
|____________________________________________|
| | p
| Reason for Discard |
| | q - 1
|____________________________________________|
| | q
| Error Report Data Field |
| | z
|____________________________________________|
Parameter Code: 1100 0001
Parameter Length: two octets
Parameter Value: type of error encoded in binary. Values are listed
in Table 7:
_______________________________________________________________________________
| Parameter Value | Class of | Meaning |
| Octet 1 Octet 2| Error | |
|__________________|_____________|_____________________________________________|
| 0000 0000 | | Reason not specified |
| 0001 | | Protocol Procedure Error |
| 0010 | | Incorrect Checksum |
| 0011 | General | PDU Discarded due to Congestion |
| 0100 | | Header Syntax Error (cannot be parsed) |
| 0101 | | Segmentation needed but not permitted |
| 0110 | | Incomplete PDU Received |
| 0111 | | Duplicate Option |
|__________________|_____________|_____________________________________________|
| 1000 0000 | Address | Destination Address Unreachable |
| 0001 | | Destination Address Unknown |
|__________________|_____________|_____________________________________________|
| 1001 0000 | | Unspecified Source Routing Error |
| 0001 | Source | Syntax Error in Source Routing Field |
| 0010 | Routing | Unknown Address in Source Routing Field |
| 0011 | | Path not Acceptable |
|__________________|_____________|_____________________________________________|
| 1010 0000 | Lifetime | Lifetime Expired while Data Unit in Transit |
| 0001 | | Lifetime Expired during Reassembly |
|__________________|_____________|_____________________________________________|
| 1011 0000 | | Unsupported Option not Specified |
| 0001 | PDU | Unsupported Protocol Version |
| 0010 | Discarded | Unsupported Security Option |
| 0011 | | Unsupported Source Routing Option |
| 0100 | | Unsupported Recording of Route Option |
|__________________|_____________|_____________________________________________|
| 1100 0000 | Reassembly | Reassembly interference |
|__________________|_____________|_____________________________________________|
___________________________________________________________________
| Function | Send | Forward | Receive |
|____________________________|____________|___________|___________|
| PDU Composition | M | (Note 1) | (Note 1) |
| PDU Decomposition | M | - | M |
| Header Format Analysis | - | M | M |
| PDU Lifetime Control | | M | I |
| Route PDU | - | M | - |
| Forward PDU | M | M | (Note 1) |
| Segment PDU | M | (Note 2) | - |
| Reassemble PDU | - | I | M |
| Discard PDU | - | M | M |
| Error Reporting | M | M | M |
| Header Error Detection | (Note 3) | M | M |
| | | | |
| Security | - | (Note 3) | (Note 4) |
| Complete Source Routing | - | (Note 4) | - |
| Complete Route Recording | - | (Note 4) | - |
| Partial Source Routing | - | (Note 5) | - |
| Partial Route Recording | - | (Note 5) | - |
| Priority | - | (Note 5) | - |
| QoS Maintenance | - | (Note 5) | - |
| Congestion Notification | - | (Note 5) | - |
| Padding | - | (Note 5) | (Note 3) |
|____________________________|____________|___________|___________|
______________________________________________________________________
| |
| ISO/TC 97/SC 6 |
| TELECOMMUNICATIONS AND INFORMATION |
| EXCHANGE BETWEEN SYSTEMS |
| Secretariat: USA (ANSI) |
| |
| |
|_____________________________________________________________________|
___________________________________________________________________________
|This document is a progression of SC6/N3862, edited to incorporate member |
|body comments and discussion at the Florence meeting of SC6/WG2. Pursuant |
|to Recommendation 5 of that meeting, comments from member bodies on this |
|revision text are requested for discussion at the Tokyo meeting of SC6 |
|and WGs. |
|__________________________________________________________________________|
_________________________________________________________________
| SN_UNITDATA .Request | SN_Destination_Address, |
| .Indication | SN_Source_Address, |
| | SN_Quality_of_Service, |
| | SN_Userdata |
|_____________________________________|_________________________|
___________________________________________
| | |
| S--TIMER .Request | S-Time, |
| | S-Name, |
| | S-Subscript |
| | |
| .Response | S-Name, |
| | S-Subscript |
|__________________________|_______________|
______________________________________________________________
| Function | Category | System Type |
|_______________________________|____________|_______________|
| Report Configuration | B | ES,IS |
| Record Configuration | B | ES,IS |
| Configuration Response | A | ES |
| Flush Old Configuration | B | ES,IS |
| Request Redirect | C | IS |
| Query Configuration | B | ES |
| Record Redirect | C | ES |
| Refresh Redirect | D | ES |
| Flush Old Redirect | C | ES |
| PDU Header Error Detection | A | ES,IS |
|_______________________________|____________|_______________|
Octet
________________________________________
| Network Layer Protocol Identifier | 1
|______________________________________|
| Length Indicator | 2
|______________________________________|
| Version/Protocol Id Extension | 3
|______________________________________|
| reserved (must be zero) | 4
|______________________________________|
| 0 |0 |0 | Type | 5
|___|__|__|____________________________|
| Holding Time | 6,7
|______________________________________|
| Checksum | 8,9
|______________________________________|
_____________________________________________________
| | Bits 5 4 3 2 1 |
|____________|______________________________________|
|____________|______________________________________|
|ESH PDU | 0 0 0 1 0 |
|____________|______________________________________|
|ISH PDU | 0 0 1 0 0 |
|____________|______________________________________|
|RD PDU | 0 0 1 1 0 |
|____________|______________________________________|
_______________________________________________
| Octet | Address parameter Length Indicator |
| n | (e.g., 'm') |
|________|____________________________________|
| Octets | |
| n + 1 | Address Parameter Value |
| thru | |
| n + m | |
|________|____________________________________|
Octet
________________________________________
|Source Address Length Indicator (SAL) | 10
|______________________________________|
| | 11
: Source Address (SA) :
| | m - 1
|______________________________________|
Octet
_______________________________________________
|Network Entity Title Length Indicator (NETL) | 10
|_____________________________________________|
| | 11
: Network Entity Title (NET) :
| | m - 1
|_____________________________________________|
Octet
_____________________________________________
|Destination Address Length Indicator (DAL) | 10
|___________________________________________|
| | 11
: Destination Address (DA) :
| | m - 1
|___________________________________________|
Octet
_______________________________________________
|Subnetwork Address Length Indicator (BSNPAL) | m
|_____________________________________________|
| | m + 1
: Subnetwork Address (BSNPA) :
| | n - 1
|_____________________________________________|
Octet
___________________________________________________
| | p
: Options :
| | q
|__________________________________________________|
Octets
_________________________________
| n | Parameter Code |
|____________|__________________|
| n + 1 | Parameter Length |
|____________|__________________|
| n + 2 | |
| to | Parameter Value |
| n + m + 1 | |
|____________|__________________|
Octet
____________________________________________
| Network Layer Protocol Identifier | 1
|__________________________________________|
| Length Indicator | 2
|__________________________________________|
| Version/Protocol Id Extension | 3
|__________________________________________|
| reserved (must be zero) | 4
|__________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|_________________________________|
| Holding Time | 6,7
|__________________________________________|
| Checksum | 8,9
|__________________________________________|
| Source Address Length Indicator (SAL) | 10
|__________________________________________|
| | 11
: Source Address (SA) :
| | m - 1
|__________________________________________|
| | m
: Options :
| | p - 1
|__________________________________________|
Octet
_______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
|Network Entity Title Length Indicator (NETL) | 10
|_____________________________________________|
| | 11
: Network Entity Title (NET) :
| | m - 1
|_____________________________________________|
| | m
: Options :
| | p - 1
|_____________________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
| Destination Address Length Indicator (DAL)| 10
|_____________________________________________|
| | 11
: Destination Address (DA) :
| | m - 1
|_____________________________________________|
|Subnetwork Address Length Indicator (BSNPAL) | m
|_____________________________________________|
| | m + 1
: Subnetwork Address (DBSNPA) :
| | n - 1
|_____________________________________________|
|Network Entity Title Length Indicator (NETL) | n
|_____________________________________________|
| | n + 1
: Network Entity Title (NET) :
| | p - 1
|_____________________________________________|
| | p
: Options :
| | q - 1
|_____________________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
| Destination Address Length Indicator (DAL)| 10
|_____________________________________________|
| | 11
: Destination Address (DA) :
| | m - 1
|_____________________________________________|
|Subnetwork Address Length Indicator (BSNPAL) | m
|_____________________________________________|
| | m + 1
: Subnetwork Address (DBSNPA) :
| | n - 1
|_____________________________________________|
| NETL = 0 | n
|_____________________________________________|
| | n + 1
: Options :
| | p - 1
|_____________________________________________|
| Quality of Service | n + 1
|_____________________________________________|
/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| | | |
| | | |
| | | |
| +-----+-----+ +-----------+ |
| | | | Request connection | | | |
UCLA { | | | -> over link 25 | | | } SRI
| | +-+-+ | +-+ +-+ | +-+-+ | |
| | | OS|---+-=|I|----------|I|=-+---| OS| | |
| | +-+-+ | +-+ +-+ | +---+ | |
| | | | | |
| | | | | |
| +-----------+ +-----------+ |
| HOST: UCLA HOST: SRI |
\ /
/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| | | |
| | | |
| | | |
| +-----+-----+ "Please send front"+-----------+ |
| | | | end control" | | | |
UCLA { | | | -> | | | } SRI ___
| | +-+-+ | +-+ +-+ | +--+---+ | | / |
| | | OS|---+-=|I|----------|I|=-+--|OS|NLS| +----+---| |
| | +-+-+ | +-+ +-+ | +------+ | | |___/
| | | DEL prog. | | | | |
| | | <- | | | |____|
| +-----------+ +-----------+ |
| HOST: UCLA HOST:SRI |
\ /
/ \
| +-----------+ +-----------+ |
| | | | | |
| | | | | |
| | terminal | | terminal | |
| | | | | |
| | | | | |
| +-----+-----+ +-----+-----+ |
| |Trivial | |
| |Responses | |
| | | |
| +-----+------+ +-----------+ |
| | | | | | | |
UCLA { | | | Major Responses | | | } SRI ___
| | +--+--+ | +-+ +-+ | +--+---+ | | / |
| | |DEL |---+-=|I|----------|I|=-+--|OS|NLS| +---+---| |
| | |front| | +-+ +-+ | +------+ | | |___/
| | | end | | | | | | |
| | |prog.| | | | | |____|
| | +-----+ | | | |
| | | OS | | | | |
| | +-----+ | | | |
| | | | | |
| +------------+ +-----------+ |
| HOST: UCLA HOST: SRI |
\ /
+---------+---------+---------+---------+
| FIELD 4 | FIELD 3 | FIELD 2 | FIELD 1 |
+---------+---------+---------+---------+
+---------+---------+---------+---------+
| FIELD 8 | FIELD 7 | FIELD 6 | FIELD 5 |
+---------+---------+---------+---------+
ADD
+-+---------+---------+---------+---------+
| | | | | |
+-+---------+---------+---------+---------+
| | | | |
| | | | v
| | | | +---------+
| | | | | |
| | | | +---------+
| | | |
| | | \ +---------+
| | | `-> | |
| | | +---------+
| | |
| | \ +---------+
| | `-----------> | |
| | +---------+
| |
| \ +---------+
| `--------------------->| |
| +---------+
|
\ +---+
`-----CARRY------------------------>| |
+---+
ADD
+---------+---------+
| | |
+--CARRY--+---------+
|
\ +-----+
ADD `-----> | |
+-----+
+- -+
|8080 (max host message length) - 32 (heading + marking)|
|-------------------------------------------------------|
| 8 (byte = 8 bits) |
+- -+
HOST (Sigma 7) <--|/|--> Outside world
Users |/|
| |/|
| |/| Special Standard
V |/| | |
+--------------+ +------------+ |/| V | V
o----| | | | |/| +------+------+
| Output |-->| Output |-->|/|-->| | |-->IMP
. . .| | | | |/| | |
| | | | |/| | | |
o----| (Multiplex) | | | |/| | |
|_ _ _ _ _ _ _ | |_ _ _ _ _ _ | |/| | _ _ _| _ _ _|
o----| | | | |/| | | |
| Input |<--| Input |<--|/|<--| |<--IMP
. . .| | | | |/| | | |
| | | | |/| | |
o----|(Distribution)| | | |/| +------|------+
| | | | |/| HARDWARE
+--------------+ +------------+ |/| Interface
NETWORK HANDLER |/|
Program Program |/|
|/| (Fig. 1)
+------------------+
| | | |
| | | interface |
| | | |
| |
| ====> Data |
| |
| ----- Logical |
| information|
+------------------+
+ - - - - - - - - - - - - - -+
| |
interface table
| +----------+ | | |
| | +---->| |<----+ | |
| | | | +----------+ | | interrupt | |
| | ^ | | +----<-------| |
| | | | +- -+ | | | | |
| | | V | _________ | V V V | |
o----| |-+ +---------+-+ | | || +-+--+--+---+ | |
| | \ |+---------+| | |_________|| |+---------+| | |
| | \|| || | | || || | |
| | +| || | - - - - - -| || || | |
| | || || | | || || | |
- - - - - -|| NETWORK ||=>- _________ -=>|| HANDLER ||=======>| |
| | +| Progr. || | | || || Progr. || | |
| | /|| || | |_________|| || || | |
| | / |+---------+| | | |+---------+| | |
o----| |-+ +-----------+ | _________ | +----+------+ | |
^ | | | | || | | |
| | | | |_________|| +--->---------->| |
| ^ +- ^ -+ Commands | |
Users | | | |
| Pool of buffers | |
User's ^
Interface |
Hardware
Interface
HOST(x) Prim. Link #12 HOST(y)
---------------------------->
! S I G N - I N : X X
HOST(x) Prim. Link #15 HOST(y)
<--------------------------
! ! R E A D Y
HOST(x) Prim. Link #12 HOST(y)
---------------------------->
! U R S A
HOST(x) Control link HOST(y)
------------------------------>
ENQ AUX 0 2 5
HOST(x) Control link HOST(y)
<--------------------------------
ACK ENQ AUX 0 2 5 0 2 1
HOST(x) Aux. Link #25 HOST(y)
-------------------------------->
X X ..... X X
HOST(x) Aux. Link #21 HOST(y)
<--------------------------------
X ......... X
|<---32 bits--->|<---32 bits--->|<----16 bits---->|<------?------>|
+---------------+---------------+-----------------+---------------+
| leader | marking | checksum | padding |
+---------------+---------------+-----------------+---------------+
Teletype
Terminal ______ ________
_________ | | ______ ______ | |
| | | USER | | | | | |SERVING |
| |-----| HOST |----| |---//---| |---| HOST |
|_________| | A | | | | | | B |
|______| |______| |______| |________|
University Stanford
of Utah Research
Institute
|----------------------------------------------------------------------|
B \ b7 ------------>| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
I \ b6 ---------->| 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
T \ b5 -------->| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
S |-----------------------------------------------|
COLUMN->| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|b4 |b3 |b2 |b1 | ROW | | | | | | | | |
+----------------------+-----------------------------------------------+
| 0 | 0 | 0 | 0 | 0 | NUL | DLE | SP | 0 | @ | P | ` | p |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 0 | 1 | 1 | SOH | DC1 | ! | 1 | A | Q | a | q |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 1 | 0 | 2 | STX | DC2 | " | 2 | B | R | b | r |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 0 | 1 | 1 | 3 | ETX | DC3 | # | 3 | C | S | c | s |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 0 | 0 | 4 | EOT | DC4 | $ | 4 | D | T | d | t |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 0 | 1 | 5 | ENQ | NAK | % | 5 | E | U | e | u |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 1 | 0 | 6 | ACK | SYN | & | 6 | F | V | f | v |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 0 | 1 | 1 | 1 | 7 | BEL | ETB | ' | 7 | G | W | g | w |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 0 | 0 | 8 | BS | CAN | ( | 8 | H | X | h | x |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 0 | 1 | 9 | HT | EM | ) | 9 | I | Y | i | y |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 1 | 0 | 10 | LF | SUB | * | : | J | Z | j | z |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 0 | 1 | 1 | 11 | VT | ESC | + | ; | K | [ | k | { |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 0 | 0 | 12 | FF | FS | , | < | L | \ | l | | |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 0 | 1 | 13 | CR | GS | - | = | M | ] | m | } |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 1 | 0 | 14 | SO | RS | . | > | N | ^ | n | ~ |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 1 | 1 | 15 | SI | US | / | ? | O | _ | o | DEL |
+----------------------+-----------------------------------------------+
<-------------32 bits --------------->
| HEADER |
|____________________________________|
| | | | |
| mark | l | <L1> | <L2> |
|______|_______|___________|_________|
| | |
| checksum | Padding |
|_________________|__________________|
typical control message (please
establish auxiliary link #L2
parallel to our primary link #l)
0 3 4 7 8 9 10 14 LINK# 24 31
_______________________________________________________________
| | | | | |////////////////|
| FLAGS | TYPE | H | SITE | 00000001 |////////////////|
|_______|______|_____|_______|_______________|________________|
Figure 1 Initial network configuration |<------------ 24bits ----------->|
| |
+---------------------------------+
| |
| Leader (32 bits) |
| __________________|
| | 100 --- ----0 |<----16 bits of marking
+--------------+------------------+
| |
| |
| Text of messages (96 bits) |
| |
+------------------------+--------+
| 100----- ----0|
+-------^----------------+
|
|______16 bits of padding added
by the interface
24 8 8
+----------------------+-----------+----------+
| User Number | | |
+----------------------+-----------+----------+
| |___AEN
|
|___HOST number
Figure 3 A typical socket
|<--- connection --->|
+---------+ +---------+
| | link | |
| process |--(|--------------|)--| process |
| | ^ ^ | |
+---------+ | | +---------+
| |
send socket receive socket
Socket Port
| | | ____________
| V V / \
V / \
|=| /==| |
-------(+)->|Y|-->< | |
|=| \==| |
| PROCESS |
| |
|=| /==| |
-------(-)->|X|<--< | |
|=| \==| |
\ /
\____________/
H O S T A H O S T C
______________________________ ______________________
| | | |
| ____ ____ ____ ____ | | ____ ____ ____ |
| |Proc| |Proc| |Proc| | | | | |Proc| |Proc| | | |
| | A | | B | | C | |UCC | | | | D | | E | |UCC | |
| |____| |____| |____| |____| | | |____| |____| |____| |
| | | | | | | | | | |
- - - - - - |- - - |- - - |- - -|- - -|- - |- - -|- - - |- - - - - -
| | | | | NCP NETWORK | | | |
| | | | | | | | | | |
| _|_____|______|______|_ | | _|_____|______|_ |
| | | | | | | |
| | N C P A | | | | N C P C | |
| |_______________________| | | |________________| |
| || | | || |
|_____________________||_______| |_______||_____________|
|| ||
- - - - - - - - - - - -|| - - - - - - - - - - ||- - - - - - - - - -
|| IMP NETWORK ||
___||___ ____||__
| | | |
| IMP |------------| IMP |
| A | | C |
|________| |________|
| |
| ________ |
| | | |
+------| IMP |-----+
| B |
|________|
HOST A | HOST B
INITIATOR | ACCEPTOR
PROCESS 'a' | PROCESS 'b'
|
|
| a. LISTEN 'socket code 9'
|
|
b. INIT 'socket code 12' 'Bb9' |
RFC 'AA12' 'Bb9' 'link 47' ==========>
|
| c. ACCEPT 'socket code 9'
| RFC 'Bb9' 'Aa12'
|
| d. TRANSMIT 'send buffer' 'len'
| 'socket 9'
<============== IMP message 'link 47' 'send buffer'
|
e. TRANSMIT 'rec buffer' 'length'
'socket 12' ============>
|
| f. CLOSE 'socket code 9'
|
last RFNM ===>
<============== CLS 'Bb9' 'Aa12'
closes socket 'Aa12' |
|
+---------+
| I M P |
+---------+
v ^
| |
+---------------------------|-----|------------------------------+
| | | |
| /\/\/\/\/\/\/\ | | /\/\/\/\/\/\/\ |
| \ / <--------+ +---< \ / |
| / Input \ / Output \ |
| \ Handler / \ Handler / <----+ |
| / \ >------+ / \ | |
| \/\/\/\/\/\/\/ | \/\/\/\/\/\/\/ ^ |
| v +-----+ |
| +-----+ | OH | |
| | IM | | Buf | |
| | Buf | +-----+ |
| +-----+ /\/\/\/\/\/\/\/\ ^ |
| /\/\/\/\/\/\/\/\ v +----> \ / | |
| \ / | | / Output \ >--+ |
| / \ <------+ ^ \ / |
| \ Input / /-----\ / Scheduler \ |
| / \ >-------->| HIQ | \ / |
| \ Interpreter / |_____| / \ |
| / \ >----+ \_____/ \/\/\/\/\/\/\/\/ |
| \/\/\/\/\/\/\/\/ | ^ v ^ |
| ^ ^ ^ \ | /-----\ | | | /-----\ |
| | \ \ \ | | O | | | | | O | |
| | \ \ \ +--->| C |>----+ | +---<| R | |
| v v v \ | C | | | M | |
| +---+ +---+ +---+ \ | Q | v | Q | |
| | | | | | | \ |_____| +---------+ |_____| |
| |ILT| |LAT| |OLT| \ \_____/ | | \_____/ |
| | | | | | | \ ^ | R T | ^ |
| +---+ +---+ +---+ +------|-------->| | | |
| v | +---------+ | |
| | ^ ^ | |
| | /\/\/\/\/\/\/\/\ | | |
| | \ / | | |
| +----------->/ System \<-------+ | |
| \ Call / | |
| / Interpreter \>--------------------+ |
| \ / |
| +-->/ \>--+ |
| | \/\/\/\/\/\/\/\/ | |
+------------------|----------------------|----------------------+
| |
+---< system calls <---+
Request Connection, Receiver to Sender
______________________________________________
| | | | |
| RTS | my socket | your socket | link |
|_______|_____________|_______________|________|
Request Connection, Sender to Receiver
_____________________________________
| | | |
| STR | my socket | your socket |
|_______|_____________|_______________|
Close
_____________________________________
| | | |
| CLS | my socket | your socket |
|_______|_____________|_______________|
Allocate
__________________________
| | | |
| ALL | link | space |
|_______|________|_________|
Interrupt Sent by Receiving Process
_______________
| | |
| INR | link |
|______|________|
Interrupt Sent by Sending Process
_______________
| | |
| INS | link |
|______|________|
Echo Request
____________________________ _________
| | \ \ |
| ECO | length / / text |
|_______|____________________\ \________|
Echo Reply
____________________________ _________
| | \ \ |
| ERP | length / / text |
|_______|____________________\ \________|
Error Detected
____________________________ _________
| | \ \ |
| ERR | length / / text |
|_______|____________________\ \________|
<my socket> and <your socket> are 32 bits long,
_______________________
| | |
| User number | AEN |
|_______________|_______|
____________
| USER | STRUCTURE OF THE NETWORK CONTROL PROGRAM
|____________|
^ | Fig. 4.1
_____|______V____
| |
| System |
| Call |
| Interpreter |
|_________________| _____________
^ | | | |
| | | +---------------| Input |
| | | | +-----| Interpreter |
| | | | | | |
| V V V V -------------
|======| |=========| |=======| | ^
| D Q | | O C C Q | | H I Q | | |
|======| |=========| |=======| | |
| ^ | | | |
| | | | | |
| +--------)----------)---------+ |
| | | |
+-------+ | +------+ |
__V___V___V__ |
| | |
| Output | |
| Scheduler | |
|_____________| |
| |
V |
(===========) (===========)
( O H B U F ) ( I H B U F )
(===========) (===========)
| ^
______V______ ______|______
| | | |
| Output | | Input |
| Handler | | Handler |
| | | |
------------- -------------
| ^
| |
+----------+ +-----------+
| |
____V____|____
| |
| I M P |
|______________|
______________
| | CLOSE
CONN/ | CLOSED |<---------------------------+
send RFC | (0) | LISTEN |
+----------------| |-----------------------+ |
| |______________| | |
| | ^ | |
| [E]RFC | | CLS/send CLS | |
| ___V____|____ ___V____|____
| non-matching | | | |
| CONN/send RFC | PENDING | LISTEN RFC | LISTENING |
| +-------------| (1) |----------+ +----| (2) |
| | |_____________| | | |_____________|
| | matching | | |
___V___V_____ CONN/send RFC| __V___V______
| | | ACCEPT/ | | CLS/
| RFC-SENT | RFC | send RFC | RFC-RECD | send CLS
| (5) |----------+ | +----------| (3) |---------+
|_____________| | | | |_____________| |
| | | | | | |
| | ___V___V___V___ SND&CLOSE | ____________ |
| | RCV&CLS/ | |-----------)->| | |
| | send CLS | OPEN | SND&CLS | | DATA-WAIT | |
| | +---------| (6) |--------+ | | (8) | |
| | | |_______________| | | |____________| |
| | | RCV&CLOSE/ | | | | |
| | | send CLS | | | | |
| | | | | | | CLS |
| | | ______V______ | | | |
| | | CLOSE/ | |CLOSE/ | | | |
| | | send CLS| CLS-WAIT |send CLS | | | |
| +---)--------->| (8) |<--------)--+ | |
| | |_____________| | | |
| | | ___V______V_ ______V___
| | | | | | |
| | | | RFNM-WAIT | | ABORT |
| | CLS | | (9) | | (4) |
| | | |____________| |__________|
| | | | |
| | ______V_______ RFNM/ | |
| | | | send CLS | |
| CLS/ +--------->| CLOSED |<----------+ |
| send CLS | (0) | ACCEPT|CLOSE |
+----------------->| |<----------------------------+
|______________|
+-------------+-------------------+---------------------+
| OVF | my socket | your socket |
+-------------+-------------------+---------------------+
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ / \ /
\ / \ port M /
\________/ \____^___/
|
RECEIVE ANY
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ / \ /
\ port N /--->SEND FROM --->\ port M /
\________/ ANY \________/
SITE K SITE L
________ R ________
/ \ e / \
/ \ n T/ \
/ \ d a \
| | e b Process B |
| Process A | z l |
| | v e |
\ / o \ /
\ port P / RECEIVE ---> u \ /
\________/ MESSAGE s \________/
SITE K SITE L
________ R ________
/ \ e / \
/ \ n T/ \
/ \ d a \
| | e b Process B |
| Process A | z l |
| | v e |
\ / o \ /
\ port P / u <--- port Q /
\________/ SEND s \________/
to site L
containing P & Q
SITE K SITE L
________ ________
/ \ / \
/ \ / \
/ \ / \
| Process A | | Process B |
| | | |
| | | |
\ port P / \ port Q /
\ / <---- transmission <---- \ /
\________/ to port T, site K \________/
containing data and L
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ / \ /
\ / RECEIVE--> port M /
\ / ANY \ /
\______/ \______/
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ port N / \ port M /
\ /--->SEND FROM --->\ /
\ / ANY \ /
\______/ \______/
______ ______
/ \ / \
/ \ / \
/ \ Rendezvous/ \
/ \ table \
| | | |
| Process A | ^ | Process B |
| | | | |
\ port P / | \ /
\ / | \ /
\ / <--RECEIVE __/ \ /
\______/ MESSAGE \______/
______ ______
/ \ / \
/ \ / \
/ \ Rendezvous/ \
/ \ table \
| | | |
| Process A | | Process B |
| | | |
\ port P / <--------- port Q /
\ / \ /
\ / SEND \ /
\______/ \______/
to site L
______ ______
/ \ / \
/ \ / \
/ \ / \
/ \ / \
| | | |
| Process A | | Process B |
| | | |
\ port P / \ port Q /
\ /<--transmission<--\ /
\ / \ /
\______/ to port P, site K \______/
_________________ __________________ _____________
| rendezvous site | <6> | destination site | | source site |
|-----------------| |------------------| |-------------|
| RECEIVE port | | RECEIVE port | | RECEIVE port|
|-----------------| |------------------| |-------------|
| SEND port | | SEND port | | SEND port |
|-----------------| |------------------| |-------------|
| | | source site | | |
| | |------------------| | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| data | | data | | data |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
|_________________| |__________________| |_____________|
transmitted transmitted received
by SEND by Network by RECEIVE
process Controller process
0 17 0 31
-------------------------- ------------------------------
| leader | | leader |
-------------------------- ------------------------------
| | 0 0 0 1| | 0 0 0 1 | |
-------------------------- ----------- |
| | | |
| | | |
| | | |
| message | | message |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
0 23
------------------------------------------
| leader |
| ----------------------
| | XXXXXXXXXXXXXXXX | <- contents of
|----------------------------------------- sending Host memory
| | (24 bits)
| Message |
| |
0 15
--------------------------------
| |
| |
| leader |
| |
--------------------------------
| |
| message |
| |
0 15 0 35
------------------------------ --------------------------------------
| | | |
| leader | | leader | 0000 |
------------------------------ --------------------------------------
| | | |
| message | | message |
| | | |
| | | |
1 2 1 L bits
---------------------------------------------------S-----------
|OUT- | | CLASS | |
|PUT | L+8 | DEP. | DATA |
|CLASS | | FIELD | |
---------------------------------------------------S-----------
1437 TR7/GROSSMAN LOGGED IN
___________________________
LINE PRINTER DOWN TILL 1600
___________________________
This acknowledges proper usercode and
sends any appropriate notes on system
status.
! LINK TO ILLIAC
The exclamation point (!) is the escape
character which flags direct input to
the PDP-11 OS:
| Half Duplex | Full Duplex
______________|_____________|_____________
| |
Character | |
Oriented | type1 | type2
| |
______________|_____________|_____________
| |
Line | |
Oriented | type3 | type4
| |
______________|_____________|_____________
1 4 3 1 1
+-----+---------------------+---------------+-----+-----+
| RTS | US | SERV | 1 | P |
+-----+---------------------+---------------+-----+-----+
1 3 1 4
+-----+----------------+-----+--------------------+
| STR | SERV | 1 | US |
+-----+----------------+-----+--------------------+
1 1 4
+-----+-----+--------------------+
| ALL | P | SPACE |
+-----+-----+--------------------+
1 3 1 4
+-----+----------------+-----+--------------------+
| CLS | SERV | 1 | US |
+-----+----------------+-----+--------------------+
1 4 4
+-----+--------------------+--------------------+
| STR | SS + 1 | US |
+-----+--------------------+--------------------+---+
| RTS | SS | SS + 1 | Q |
+-----+--------------------+--------------------+---+
1 4 4
+-----+--------------------+--------------------+
| STR | US + 1 | SS |
+-----+--------------------+--------------------+---+
| RTS | US | SS + 1 | R |
+-----+--------------------+--------------------+---+
1 4 3 1 1
+-----+--------------------+----------------+-----+-----+
| RTS | US | SERV | 1 | P |
+-----+--------------------+----------------+-----+-----+
1 3 1 4
+-----+----------------+-----+---------------------+
| CLS | SERV | 1 | US |
+-----+----------------+-----+---------------------+
1 4 4
+-----+--------------------+---------------------+
| STR | SS + 1 | US |
+-----+--------------------+---------------------+---+
| RTS | SS | US + 1 | Q |
+-----+--------------------+---------------------+---+
1 4 4
+-----+---------------------+--------------------+
| STR | US + 1 | SS + 1 |
+-----+---------------------+--------------------+---+
| RTS | US + 1 | SS | R |
+-----+---------------------+--------------------+---+
________________________________
| |
| ________________ |
| | local | | one
| | reference | | <== site ____________
| | material | | ( )
| -----------------| | ( )
| | => (____________)
| | || \\
| | || Other sites
| | || \\
| ________ | || ____________
| local =====> | |================ ( )
| users | agent |=====|===============( )
| =====> |________| | (____________)
| |
|________________________________|
| "2741" | "33, 35, 37" |
| hard wire | 2 separate |
| local echo | lines all |
| computer does | printed |
| not echo | |
____________|_________________|___________________|
Process | hard | X |
each | | |
character | | |
____________|_________________|___________________|
Process | X | easy |
only after | | |
EOL | | |
____________|_________________|___________________|
_____|_____|_____|_____|_____
| | | |
systems_____|_____|_____._____|_____
| | | |
_____|_____._____|_____|_____
| | | |
_____|_____|_____|_____|_____
| | | |
terminals
1 2 n 1 2 m
|----------------------------------------------------|
| n | | | | | m | | | | |
|----------------------------------------------------|
<------- record -----------> <-------- record ------->
Term Format 1
+---------------------------------------------------------------------+
| |
| name ( data replication . value : length ) |
| type expression expression expression |
| |
|_____________________________________________________________________|
Term Format 2
+---------------------------------------------------------------------+
| |
| name (label) |
| |
+---------------------------------------------------------------------+
Term Format 3
+---------------------------------------------------------------------+
| |
| name ( programming connective operand ) |
| variable expression |
| |
+---------------------------------------------------------------------+
CHECK <--- '10101111'BYTE + 01010000'BYTE + '11111010'BYTE +
'00000101'BYTE
ENDOFBLOCK<----'0'BYTE
REMOTE SITE CENTRAL SITE (CCN)
+---------------------+ +--------------------+
| a | | |
| Console Input o----------->o f |
| b | | |
| Console Output o<-----------o g |
| c | | |
| Card Reader o------------o h |
| d | | |
| Printer o<-----------o i |
| e | | |
| Card Punch o<-----------o j |
| | | |
+---------------------+ +--------------------+
36-Bit Words Transmitted
From MITDG's PDP-10 to
Harvard's PDP-1
+---------------+---------------+
| | count |
+---------------+---------------+
First word of results | |
Specified in Image+0. | |
| results |
| |
| |
| |
| |
| |
| |
Last word of results | |
specified in Image+1. | |
+-------------------------------+
Host Providing Host Providing
Computational Facility Reconfiguration Service
+--------------------+ STANDARD +-----------------------------+
| | FORMAT | +----------+ +-----------+ |
| |------------|--| Inter- |-| Display | |
| | (of Macro | /| preter | | Handler | |
| | Form Data) |//+----------+ +-----------+ |
+--------------------+ //--------------------|-------+
// |
/( +-----------+
/ \ | Terminal |
/ \ +-----------+
/ \
/ \
/ \
NON-STD. / \ NON-STD.
(Terminal Order Codes) / \ (Detailed Data)
/ \
/ \
/ \
/ \
/ \
/ \
| |
+-------|-------+ +-------|-------+
| | | | +-----------+ |
Minimum | | | | | Display | | Minimum
Host | | | | | Handler | | Host
| | | | +-----------+ |
+-------|-------+ +-------|-------+
| |
+-----------+ +-----------+
| Terminal | | Terminal |
+-----------+ +-----------+
8 32 32 8
+-----+------------+------------+-----+
| RTS | US | SERV | P |
+-----+------------+------------+-----+
8 32 32
+-----+-----------+------------+
| CLS | SERV | US |
+-----+-----------+------------+
8 32 32
+-----+-----------+------------+
| CLS | US | SERV |
+-----+-----------+------------+
8 32 32
+-----+-----------+------------+
| STR | SERV | US |
+-----+-----------+------------+
8 32 32
+-----+-----------+------------+
| CLS | SERV | US |
+-----+-----------+------------+
8 32 32
+-----+-----------+------------+
| CLS | US | SERV |
+-----+-----------+------------+
<------------16------------>
__________________________
| |
|_ _ _ _ LEADER _ _ _ _ |
| |
|__________________________|
| |
| BYTE COUNT |
|__________________________|
| | |
BYTE SIZE-----|----> | |
|____________|_____________|
| | |
| |<------------|--Beginning of first
|____________|_____________| data byte
| |
| |
1 1 1 variable 1
+-------+-------+-------+ / +------//--------+-------+ \
| | | BREAK | / | | BREAK | \
| x'00' | x'00' | CHAR. | \ | CARD IMAGE | CHAR. | / ...
+-------+-------+-------+ \ +------//--------+-------+ /
1 1 1 2 L bits
+-------+-------+ / +-------+-------+-----//-----+ \
| | | / | | | TEXT | \
| x'00' | x'80' | \ | x'01' | L | card image | / ...
+-------+-------+ \ +-------+-------+-----//-----+ /
1 1 80
+-------+-------+ / +--------------------+ \
| | | / | | \
| x'00' | x'C0' | \ | card image | / ...
+-------+-------+ \ +--------------------+ /
________________________________________________________________________
*This restriction is temporary; a fix is in the works and will be
announced.
Installation __________________________ Prepared By _______________
System** _____________________________ Date _____________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
Remarks: ____________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
+-----------------------------------+
| |
| leader |
| |
+--------+--------+-----------------+
| | | |
| M1 | S | C |
| | | |
+--------+--------+-----------------+
| | ^ |
| M2 | | |
| | | |
+--------+ | |
| | |
| | |
| |
| Text |
// //
| | |
| | |
| | |
| | |
| | +--------+
| | | |
| | | M3 |
| v | |
+-----------------+--------+--------+
| |
| 10 --------- 0 | <-- Padding
| |
+-----------------+
| 8 | 32 | 32 | 8 |
+-----+-----------------------+-----------------------+-----+
| | | | |
1. | STR | send socket | receive socket | |
| | | | ^ |
+-----+-----------------------+-----------------------+--|--+
|
| 8 | 8 | 16 | 32 | +-- byte size
+-----+-----+-----------+-----------------------+
| | | | |
2. | ALL | link| msg space | bit space |
| | | | |
+-----+-----+-----------+-----------------------+
| 8 | 8 | 16 | 32 |
+-----+-----+-----------+-----------------------+
| | | | |
3. | RET | link| msg space | bit space |
| | | | |
+-----+-----+-----------+-----------------------+
| 8 | 8 | 8 | 8 |
+-----+-----+-----+-----+
| | | | |
4. | GVB | link| fM | fB |
| | | ^ | ^ |
+-----+-----+--|--+--|--+
| |
| +-- bit fraction
+-------- message fraction
| 8 | 8 | 80 |
+-----+-----+---------------------- // -----------------------+
| | | |
7. | ERR | | text |
| | ^ | |
+-----+--|--+---------------------- // -----------------------+
|
+-- error code
| Hex Code
ASCII |-------+--------
Symbol | ASCII | EBCDIC
-------+-------+--------
DC3 | 13 | 3A
| |
` | 60 | 70
| |
\ | 5C | 71
| |
^ | 5E | 72
+---+---+---+---+---+---+---+---+
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+---+---+---+---+---+---+---+---+
Code Structure
| <code><filler count><NUL><data count><NUL> | <data><filler> |
| |____||____________||___||__________||___| | |____________| |
| | | | | | | | |
| 24-bits 8-bits 8-bits 24-bits 8-bits| variable length |
| <-------descriptor field 72-bits---------> |<--data and filler-->|
| | |
8 16 32
______________//______//_________//__________//_________________//__
| | | | | | | | |
| OP | | | ACCESS |MODIFICATION| NEW | | |
|CODE|FLAGS|FILENAME|PASSWORD| PASSWORD | FILENAME|BIT COUNT| DATA |
|____|_____|___//___|__//____|____//______|___//____|_________|__//__|
8 8*LENGTH
________________________//___
| | |
| LENGTH | FILENAME/PASSWORD |
|________|_______________//___|
M
O
D
I
F
I
A C
C A
C T
E I N
S O E
S N W
B
F P P F I
O I A A I T
P L S S L
F E S S E C
C L N W W N O D
O A A O O A U A
D G M R R M N T
E S E D D E T A
_____________________________________________________________
ALF X X X X X X
_____________________________________________________________
UDF X X X X X X
_____________________________________________________________
RPF X X X X X X
_____________________________________________________________
RTF X X X X X
_____________________________________________________________
SPF X X X X X
_____________________________________________________________
DLF X X X X
_____________________________________________________________
RNF X X X X X
_____________________________________________________________
FNO X
_____________________________________________________________
NOP X
_____________________________________________________________
8 8 32
_________//___________________________//____
| OP | | CMPL | | |
|CODE | FILENAME | CODE |BIT COUNT| DATA |
|_____|___//_____|______|_________|____//____|
8 8*LENGTH
_______________//______
| | |
| LENGTH | FILENAME |
|________|______//______|
C
O
M
P
L
E
F T B
I I I
O L O T
P E N
C
C N C O D
O A O U A
D M D N T
E E E T A
_____________________________________________________
RTF X X X X X
_____________________________________________________
SPF X X X X
_____________________________________________________
Receiver NCP Sender
-+---+---+---+---+ +--------+ +-----+-----+---
|000|001|010|011| <--- | Buffer | <--- |00000|10100|11
-+---+---+---+---+ +--------+ +-----+-----+---
31 1
+-------------------------------+-+
1. | Arbitrary | | <-- gender
+-------------------------------+-+
24 7 1
+------------------------+------+-+
2. | User ID | tag | | <-- gender
+------------------------+------+-+
+--------------------- ---------------------+
| |
| Fixed, unique / / Variable |
| Identifier / / Identifier |
| |
+--------------------- ---------------------+
_________ _________/ _________ _________/
/ /
Identifies the Identifies a particular
program uniquely connection of the program
24 7 1
+------------------------+---------+-+
| Program Number |Multiplex| | <-- Gender
| | Code | |
+------------------------+---------+-+
|<------- 32 ------->|<-8->|<-8->|<-- 16 -->|<-8->|<---
+--------------------+-----+-----+----------+-----+------------------
| leader | x |size | count | x | TEXT
+--------------------+-----+-----+----------+-----+------------------
|<---- level 1 ---->|
message leader
|<------------------ level 2 ------------------>|
message preamble
USING HOST Serving HOST
-----------------------+ +----------------------
| |
\ | | /
\ -----------------| +-+ +-+ |-----------------/
\ NCP | |I| |I| | NCP /
\ ^ <--->|M|---NETWORK--|M|<---> ^ /
\ -----|-----+ | |P| |P| | +-----|-----/
\ v | | +-+ +-+ | | v /
USER \ | | | | TELNET / USER
PROCESSES, ) TELNET |--| |--|Protocol( PROCESS
Sub <===> | | | |Routing<--->Sub
Systems, / ^ | | | | ^^ \Systems
ETC /-----|-----+ | | +----||-----\ETC
/ TTY v <---> Local Local <===> TTY vv \
/ Handles | Terminals Terminals| Handles <===>
/-----------------| |-----------------\
/ | | \
| |
-----------------------+ +----------------------
+-------------+ CC +-----------+ SC +-----------+
| ORIGINATING +--------+ DRS +--------+ SERVER |
| USER | ^ | | ^ | PROCESS |
+-------------+ | +------+----+ | +-----------+
| / |
Telnet / <------ Simplex or Duplex
Protocol UC/ Connections
Connection /
/
+-----+-----+
| USER |
| PROCESS |
+-----------+
+--------------+
+--------+ CC | |
+-------+ TELNET +-------+ DRS |
| +--------+ | |
| +--------------+
+----------+---------+
| USER |
|(TERMINAL OR PROGRAM|
+--------------------+
+--------+ CC +--------+ +------+
| +------+ | SC | |
+------+ /| TELNET | UC | DRS +------+ SP |
| |/ | +------+ | | |
| USER | /+--------+ +--------+ +------+
| |/
+------+
+--------+
+------+ /| USER | CC +--------+ +------+
| |/ | SIDE +------+ | SC | |
| USER | +--------+ UC | DRS +------+ SP |
| |\ | SERVING+------+ | | |
+------+ \| SIDE | +--------+ +------+
+--------+
/\/\ /\/\
^ | | FORM | | ^
| | | ----------------- | | |
| | | +- ----------------- -+ | | |
| | | | CURRENT PART OF | | | |
INPUT | |<= CURRENT < ----------------- > CURRENT => | | OUTPUT
STREAM | | POINTER | FORM BEING APPLIED | POINTER | | STREAM
| | +- ----------------- -+ | |
| | ----------------- | |
| | ----------------- | |
| | ----------------- | |
\/\/ \/\/
Figure 5. Application of Form to Data Streams
|
| +-----------------
| /:
| / :
| / :
| / :
| / :
| / :
-----+------------------------------------
| a
|
|<------- 32 ------->|<-8->|<-8->|<-- 16 -->|<-8->|<---
+--------------------+-----+-----+----------+-----+------------------
| leader | x |size | count | x | TEXT
+--------------------+-----+-----+----------+-----+------------------
|<---- level 1 ---->|
message leader
|<------------------ level 2 ------------------>|
message preamble
USING HOST Serving HOST
-----------------------+ +----------------------
| |
\ | | /
Sub- \ -----------------| +-+ +-+ |-----------------/
Sys- \ | |I| |I| | NCP /
tems+---> <--->|M|---NETWORK--|M|<---> ^ /
| \ NCP | |P| |P| | +-----|-----/
| \ | +-+ +-+ | | v /
| \ | | | TELNET / USER
TELNET )___________| |--|Protocol( PROCESS
| ) | | |Server <--->Sub
| / | | | ^^ \Systems
| / TTY | | +----||-----\ETC
User +---> HANDLER <---> Local | TTY vv \
Pro- / | Terminals | Handles \
cesses/-----------------| |-----------------\
/ | | \
| |
-----------------------+ +----------------------
+------------+ +------+ +---------+
| ORIGINATING| CC | DRS | SC | SERVER |
| USER |--------------| |----------| PROCESS |
+------------+ ^ +------+ ^ +---------+
| / |
| UC/ <-----\ |
| / \ |
| +-----------+ \|
TELNET ---------+ | USER | +-- Simplex or Duplex
Protocol | PROCESS | Connections
Connection +-----------+
+---------+ CC +---------+
+---------| TELNET |-------| DRS |
| +---------+ +---------+
+-----------------------+
| USER |
| (TERMINAL OR PROGRAM) |
+-----------------------+
+-------+ +--------+ CC +-----+ +----+
| |----| |---------| | SC | |
| USER | | TELNET | UC | DRS |--------| SP |
| |----| |---------| | | |
+-------+ +--------+ +-----+ +----+
+---------+
+------+ /| USER | CC +-----+
| |---/ | SIDE |--------| | SC +----+
| USER | +---------+ UC | DRS |--------| SP |
| |---\ | SERVING |--------| | +----+
+------+ \| SIDE | +-----+
+---------+
/\/\ /\/\
^ | | FORM | | ^
| | | ----------------- | | |
| | | +- ----------------- -+ | | |
| | | | CURRENT PART OF | | | |
INPUT | |<= CURRENT < ----------------- > CURRENT => | | OUTPUT
STREAM | | POINTER | FORM BEING APPLIED | POINTER | | STREAM
| | +- ----------------- -+ | |
| | ----------------- | |
| | ----------------- | |
| | ----------------- | |
\/\/ \/\/
Figure 5. Application of Form to Data Streams
+------------------+---------------------+---------------------+
| Type | I send | I receive |
| | | | | | | | | | | | | | | | | |
| B3 |0|0|BA|B2|B9|B1|B8|B0|0|0|BA|B2|B9|B1|B8|B0|
+------------------+---------------------+---------------------+
+------------------+------------------+
| Type | End Code |
| | | |R| |
| | |G|E| |
| B4 | F|R|C|U|
| | I|O|O|N|
| | L|U|R|I|
| | E|P|D|T|
+------------------+------------------+
+------------------+-------------------+-----------------+
| Type | Error Code | Sequence # |
| | | |
| B5 | | |
+------------------+-------------------+-----------------+
+-------------------+--------------------+
| Type | Function |
| | | | |R| |
| | | |G|E| |
| | |F|R|C|U|
| | |I|O|O|N|
| | |L|U|R|I|
| | |E|P|D|T|
+-------------------+--------------------+
Read / List_file_directory request
------------------------------------->
User <File -- data> Server
<-------------------------------------
End of file indication
<-------------------------------------
User Store / Append request Server
------------------------------------->
<File -- data>
------------------------------------->
End of file indication
------------------------------------->
Acknowledge
<-------------------------------------
User Rename_from request Server
------------------------------------->
Rename_to request
------------------------------------->
Acknowledge
<-------------------------------------
User Delete Server
------------------------------------->
Acknowledge
<-------------------------------------
O 15 16 23 24 30 31
---------------------------------------------------
| | | | |
---------------------------------------------------
^ ^ ^ ^
|_ zero | | |_ gender
| |
| |_ zero for initial
| contact, otherwise
| dynamically assigned
| by 3rd level user
| program
|_ administratively assigned (fixed
and associated with programs)
1 4 3 2 2 3
+-----------------------+ +-----------------+ +-------------------+
| | | | | | | | | | |
| B | BL | CLR | | TX | | | OR | SZ | |
| | | | | | | | | | |
+-----------------------+ +-----------------+ +-------------------+
NETWORK | Using Host
| +-------+
| | |
| | NGDL | +--------+ +-------+
+--------+ | |--------->| | | |
| |------>| | | NGLI |------>| NGS |
| NGDS | +-------+ | | | |
| | +-------+ | | | |
| |------>| |--------->| | +-------+
+--------+ |IMAGE | +--------+
| |AREA | ^
| |DEFINI-| |
| |TIONS | V
| +-------+ *--------+
| | NGLES |
| | & |
| | NGLP |
| +--------+
+----------------------------+
| | _______
| +---------+-----------+ | / \
| | |OUTPUT | | / \
| | /-->|PROCESSOR |----|------------>| |
| | / +-----------+ | \ /
| | | | | \_______/
| | | | | OUTPUT DEVICE
| | | +-----------+ | ______
| | \ |INPUT | | | \
| | \---|PROCESSOR |<-- |-------------|_______\
| +---------+-----------+ |
| Graphic Application | INPUT DEVICE
| Program |
+----------------------------+
/SERVING\ HOST
\USING /
+-------------------------------------+ ______
| | /---->/ \
| +-----------+ |DEVICE-DEPENDENT/ ___/___ \
| +-----------+ |--|---------------/ / \ |
| STANDARD | OUTPUT | | |DISPLAY LIST / \ /
| +-----+DISPLAY LIST|PROCESSOR |-+ | | |__/
| | ---|----------->| |----|---------------->\ /
| | | | +-----------+ | \_______/
| | | | | OUTPUT DEVICE(S)
| | | | |
| | | | +-----------+ |DEVICE-DEPENDENT ______
| | | | STANDARD +-----------+ |<-|----------------------| \
| | |--|<-----------|INPUT | | |INPUT DATA ___|___ \
| +-----+ ATTENTION |PROCESSOR |-+ | | \____\
| | |<---|------------------| \
| +-----------+ | |_________\
| Graphic Application Program | INPUT DEVICE(S)
| |
+-------------------------------------+
/SERVING\ HOST
\USING /
The initializing call is GRIDSET(N, M, IRNGE)
|<--- I ------>|
where N is the number of spaces --- +--+--+--+--+--+--+--+--+
across, M is the number down, ^ |--|--|--|--|--|--|--|--|
and IRNGE tells how many grey | |--|--|--|--|--|--|--|--|
levels to use. This is primarily J |--|--|--|--|--|--|--|--|
for grey-scale displays or | |--|--|--|--|--|--|--|--|
pseudogrey-scale displays. v |--|--|--|--|--|--|--|--|
--- |--|--|--|--|--|--|--|--|
|--|--|--|--|--|--|--|--|
+--+--+--+--+--+--+--+--+
The display mode is raster ________________________
oriented, and each "pseudo- | _ _ _ _ _ _ |
character" will be on a N x M | |_| |_| |_| |_| |_| |_||
matrix of dots. (A later | _ _ _ |
embellishment for printers | |_| |_| |_| . . . |
would include matrix of characters.) | _ _ |
Parameters DEFINITION and CODE | |_| |_| . . . |
are both arrays, used together to | . \ \ |
specify the "pseudo-character" set. | . \ \ |
DEFINITION is packed with bits |________\___\___________|
according to the following scheme: \ \
\ \
\ __\_______
\ / \
\/ ________ \
/ |_|_|_|_| \
/ |_|_|_|_| \
| |_|_|_|_| |
| |_|_|_|_| |
\ |_|_|_|_| /
\ |_|_|_|_| /
\ /
\___________/
_ <-----------------------------------+
| |
| |
- <--If WAR here, it is set to here,+
| and error condition 5 is
| recognized.
|
Establish network connection
SETUP,,0 ; start
2n,,0 ; data representing "n" line
; segments follow
+----------------+ _
| | |
| | - 2n coordinate pairs
| | _|
+----------------+
TRANSMIT,,2 ; request ARDS transmission
0,,1000 ; convert and transmit the
; whole "program"
FLUSH,,0 ; signoff
+-->length,,2000 ; length of display pgm
| - ; large output area
| | -----
| | -----
+--> -----
| program
| -----
| -----
-
| NC |
--------------- ^
| /
----> in | out /
--------------------------------
| Express Exchange |
<---- --------------------------------
out in ^
\
\
Net Controller
-------------------------------
| | |
NJID(1) NJID(2) - - - NJID(N)
---------------------- . . . . .
| |
Stepname Stepname
-------------------------------
| | |
LMID(1) LMID(2) LMID(n)
-----------------------------------
| |
LMSN(1) LMSN(2) LMSN(n)
<---- n text bytes ------>
+--+-----+ +--------+ +--------+ +--------+
TRUNCATED <--> |11|Devid| | n (8) | | Text | . . . | Text |
RECORD | | (6) | | | | (8) | | (8) |
+--+-----+ +--------+ +--------+ +--------+
/ \
| +---+----+ | *
| |110| n | (n blanks) |
| | |(5) | |
| +---+----+ |
| |
+--+-----+ / +---+----+ +--------+ |
COMPRESSED<--> |10|Devid|< |111| n | |Char- | (n replications |
RECORD | | (6) | \ | |(5) | | acter | of "Character") |
+--+-----+ | +---+----+ +--------+ |
| |
| +--+-----+ +--------+ +--------+ |
| |10| n | | Text | . . .| Text | |
| | | (6) | | (8) | | (8) | |
| +--+-----+ +--------+ +--------+ |
\ /
+------+
| X'00'|
| |
+------+
Telnet-
NCP- ICP User Server like Log-on Accessed
NCP-1 107 80 Telnet Telnet Protocol Procedure Services
-----------------------------------------------------------------
SDC | x | | | | | | | |
-----------------------------------------------------------------
UCLA-91 | | x | | x | x | | | |
-----------------------------------------------------------------
UCLA-S7 | x | x | x | x | x | | x | x |
-----------------------------------------------------------------
SRI-10 | | x | | | | x | x | |
-----------------------------------------------------------------
UCSB | x | x | x | | | | x | x |
-----------------------------------------------------------------
MIT-10 | | x | | x | | | | |
-----------------------------------------------------------------
MIT-645 | |par-| | | | | | |
| |tial| | | | | | |
-----------------------------------------------------------------
LL-67 | x | | x | | x | | | |
-----------------------------------------------------------------
BBN-10 | | x | | | | x | x | x |
-----------------------------------------------------------------
UTAH | x | x | x | | | x | | |
-----------------------------------------------------------------
+------------------+ +------------------+
|Initial Input Ptr.| | Output pointer |
+------------------+ +------------------+
+------------------+ +------------------+
|Current Input Ptr.| | True/False Flag |
+------------------+ +------------------+
+---------------------+
| length n in bytes |
+-- +---------------------+
| | |
| | compiled |
| | 16-bit |
n < | instructions |
| | |
| | |
| | |
+-- +---------------------+
+-----------------+
| length n |
| in bytes |
+-- +------------------+-----------------+
| | numeric value of | byte offset |
| | statement number | in inst. seq. |
| +------------------+-----------------+
| | : : |
n < | : : |
| | : : |
| | |
| | |
| | |
+-- +------------------------------------+
+-------------+--------------+
1 1 | length n | length n |
___/\____ ___/\____ | in bytes | in bytes |
+---------+----------+-------------+--------------+
/ | |//////////| | |
| | Type |//////////| bit length | byte offset |
| | |//////////| | |
| +---------+----------+-------------+--------------+
5*n < | : |
| | : |
| | : | Identifiers
| | |
\ | |
+-------------------------------------------------+
/ | |
| | literals are |
| | byte-aligned | Literals
m < | |
| | |
| | |
\ +-------------------------------------------------+
+---+---+-----+-------+ +-------------------+ word-aligned,
| T |///| L | ---+-----> | | 32-bit right-
+---+---+-----+-------+ +-------------------+ justified
byte-aligned, L <= 256
+---+---+-----+-------+ +------------------------+
| T |///| L | ---+-----> | |
+---+---+-----+-------+ +------------------------+
+--------+------------------------+
| 4 | 12 |
+--------+------------------------+
|
/
/
/
|
V
LD = 0 literal or identifier reference (12-bit positive integer)
IC = 1 12-bit two's complement integer constant
OP = 2 operator
AD = 3 address (12-bit positive integer)
ARB = 4 indefinite replication factor
NULL = 5 missing attribute of term
4 4 8
+--------+--------+----------------+
| 0010 | |////////////////|
+--------+--------+----------------+
OP |
+----------> 0 = binary operator
1 = unary operator
2 = special operator
+---+ <-- TOS +-----+ <-- TOS
| y | | x-y |
e.g. x-y => +---+ ===> +-----+
| x | |/////|
+---+ +-----+
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0000 | |////////|
+--------+--------+--------+--------+
|
+--------------------------+
|
V
0 = integer +
1 = integer -
2 = integer x
3 = integer : (or /), no remainder
4 = concatenate ||
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0001 | | |
+--------+--------+--------+--------+
| |
+--------------+ |
| |
V |
0 = integer minus V
1 = load identifier 0 = evaluated contents
(after dec - binary
conversion)
1 = length field
2 = type field
2 = Label Table Reference
4 4 4 4
+--------+--------+--------+--------+
| 0010 | 0010 | | |
+--------+--------+--------+--------+
| |
+-----------------------+ /
| /
V /
0 = store TOS |
1 = return V
2 = branch 0 = true, 1 = false, 2 = unconditional
8 8 16 16
+----------+----------+---------------+---------------+
| Op code | 0 | X - coord. | Y coord. |
+----------+----------+---------------+---------------+
0 1 2 3 4 5
8 8 8 8 16 16 16 8 8 8 8
+--+---+-----+-----+---.---+---.---+---.---+-----+-----+ +-----+-----+
|Op| 1 |Flags|Scale| N.o | . | . |delta|delta|..|delta|delta|
| | | | |poi.nts| X0. | Y0. | X1 | Y2 | | Xn | Yn |
+--+---+-----+-----+-------+-------+-------+-----+-----+ +-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 2n+10 2n+11
8 8 8 8 8 16 16 16 8 8 8 8
+--+-+-----+-----+----+---.---+---.-+---.-+-----+-----+ +-----+-----+
|Op|2|Flags|Scale|Rate| N.o | X0. | Y0. |delta|delta|..|delta|delta|
| | | | | |poi.nts| . | . | X1 | Y1 | | Xn | Yn |
+--+-+-----+-----+----+----------+--+-----+-----+-----+ +-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 2n+11 2n+12
---- +-------------+-----
^ | | ^
| | | |
| | W
2W | Xp, Yp __|__v__
| |
| | |
v | |
-----+-------------+
| <-- 2W --> |
8 8 8 8 8 8 16 16 16 16 16 16 16
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
|3|Flags|Scale|Rate |Window| # | X0 | Y0 |Xmin|Ymin |Xmax |Ymax |
| | | | | Size |points| | | | | | |
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
8 8 8 8 8 8
-----+-----+-----+-//-----+-----+-----+
delta|delta| RCP1| //delta|delta| RCPn|
X1 |Y1 | | Xn | Yn | |
-----+-----+-----+-//-----+-----+-----+
20 21 22 20 21 22
8 8 8 8 8 8 16 16 16 16 16 16 16
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
Op|3|Flags|Scale|Rate |Window| # | X0 | Y0 |Xmin |Ymin |Xmax |Ymax |
| | | | | Size |points| | | | | | |
--+-+-----+-----+-----+------+------+----+----+-----+-----+-----+-----+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
8 8 8 8 8
-----+-----+-----+ +-----+-----+
delta|delta|delta|...|delta|delta|
X1 |Y1 | X2 | |Xn |Yn |
-----+-----+-----+ +-----+-----+
20 21 22 2n+20 2n+21
-+
CURSOR m |
WRITE n, text - URSA writes a request
LOCAL |
-+
-+
+- +-+ |_ User types response
| _BREAK_ | |
- -User Presses | _TRANSMIT_ |key - - -+
+- -+ -+
SAVE |
CURSOR p - URSA reads response
SREAD |
-+
+--------------------+
| |
+------>| LOCAL |------+
| +--->| State | |
| | +--------------------+ |
| | | | |
| | | | |
| | |Break | |
| | | | | INS received
LOCAL | | | key | |
| | | [send INS | |
Command | | | and X'80'] | |
Executed| | | |Transmit|
| | Reset | | |
| | | | key |
| | key | | |
| | v v |
| | +--------------------+ |
| +---| Control |<------+
| | State |
+------| |
| +--------------------+
| ^
| | Keyboard locked,
| | Execute Commands
+------+
After INS is
received, LOCAL
command is ignored
until SYNC (X'80')
is encountered
To | | Also |Push | Or |Code Sent |Upon receipt
Send| (Explanation)| Known as |Either| |is (in hex)|Displayed as
----+--------------+----------+------+---------+-----------+------------
NUL |NULL | ^@ | [2] | | 00 |
| | | | | |
SOH |Start of | [3]^A | LS |[4]CASE A| 01 |
| Heading | | | | |
| | | | | |
STX |Start of Text | ^B | ATAN | CASE B | 02 |
| | | | | |
ETX |End of Text | ^C | LOG | CASE C | 03 |
| | | | | |
EOT |End of | | | | |
| Transmission| ^D | REFL | CASE D | 04 |
| | | | | |
ENQ |Enquiry | ^E | [4] | CASE E | 05 | [5] <ENQ>
| | | | | |
ACK |Acknowledge | ^F | UP | CASE F | 06 | <ACK>
| | | | | |
BEL |Bell | ^G | DOWN | CASE G | 07 | <BELL>
+--------------------------------------------------------------+
| |
| |
| |-+
| UCSB OLS INIT STATS | |Feed-
| |-+back
| |-+
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |OLS
| | |Dis-
| | |play
| | |Area
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| |-+
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
+--------------------------------------------------------------+
| |
| |
| |-+
| UCSB OLS CONNECTED | |Feed-
| |-+back
| ENTER USER NUMBER 196 |-+
| ID NUMBER= | |
| USER NAME= ARPA | |
| JOB NAME= RAND/RFC | |
| AUTOSAVE CODE = 3 | |
| LOAD MOLSF | |
| FILE LOADED | |
| | |
| | |
| | |OLS
| | |Dis-
| | |play
| | |Area
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| |-+
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
+--------------------------------------------------------------+
| |
| ___ ___ |-+
| / \ / \ | |
| / \ / \ | |
| / \ / \ | |
| / \/ \ | |
| / /\ \ | |
| / / | |
| / \ \ | |
| / \ \ | |
| / / | |
| \ \ | |
| / / \ \ | |
| ___________________________________________ | |
| | |
| \ | | \ | |OLS
| / / | |Dis-
| \ \ | |play
| / / | |Area
| \ / \ | |
| / \ | |
| \ / / | |
| \/ / \ | |
| \ / \ | |
| / \ / \ | |
| / \ / \ | |
| __/ \___/ \__ | |
| |-+
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ |-+
|| 0 | I | II|III|IV | V |VI |VII|REL|CMX|SYS|USR|TYP|LST|CALL | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||PLS|MIN|TIM|DIV|SQ |SQT|CNJ|INV|DIF|SUM|PRD|SOR|PRD|TST|CLOSE| |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |Input
||LS |RS |REF|UP |DWN|EVL|SUB|MAX|MOD|NEG|CTX|ENL|CON|RPT|COPY | |But-
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |tons
||SIN|COS|LOG|EXP|PWR|ATN|ARG|DEL|CNV|ID |LOD|STO|ENT| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
||CAS| | | | | | |DIS|<<<|BEL| |ERS|RST| | | |
|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | |
| ABCDEFG + = / # 12345 | |
| HIJKLMN , ; = . 67890 | |
| OPQRSTU <-<-<-<- ()? | |
| VWXYZ b ' \ \ |-+
+--------------------------------------------------------------+
RAND 360/65 MVT OPERATING SYSTEM Network address 7.
___________________________________________________
HARVARD PDP-10 DEC 10/50 MONITOR Network address 9.
___________________________________________________
LINCOLN LABS IBM 360/67 CP-CMS Network address 12.
__________________________________________________
CASE PDP-10 DEC 10/50 MONITOR Network address 13.
_________________________________________________
CARNEGIE PDP-10 DEC 10/50 MONITOR Network address 14.
_____________________________________________________
+-----------------+---------------------+
|Type | I receive |
| B3 | |
| |0|0|BA|B2|B9|B1|B8|B0|
+-----------------+---------------------+
+------------+------------+-------------------------+
|Type | End Code | Sequence Number |
| B4 | | | |
| | | | |
+------------+------------+------------+------------+
+------------+------------+-------------------------+
|Type | End Code | Sequence Number |
| B5 | | | |
| | | | |
+------------+------------+------------+------------+
+------------+------------+
|Type | Function |
| B6 | |
| | |
+------------+------------+
User < File -- Data> Server
<-----------------------------
End of file indication
<-----------------------------
Create / Store / Append / Append_with_create requests
----------------------------->
User <File --- Data> Server
----------------------------->
End of file indication
----------------------------->
Acknowledge
<-----------------------------
User Rename_from request Server
----------------------------->
Rename_ro request
----------------------------->
Acknowledge
<-----------------------------
User Delete Server
----------------------------->
Acknowledge
<-----------------------------
A. User site sending at time path is broken:
/
/ Append at sequence number
| ------------------------------------------->
| Acknowledge
| <------------------------------------------
| Data
| ------------------------------------------->
|
\ The server site agrees to resume at the user-chosen point.
\ The first data transaction is numbered with the chosen
\ sequence number.
/ Append at sequence number
/ ------------------------------------------->
| Use this sequence number
| <-------------------------------------------
| / Data
| / --------------------------------->
| \ The user site agrees to use the server-chosen number
| \ and the first data transaction is numbered with the
| \ chosen number.
|
| or
|
| / Unsuccessful Terminate
\ / ------------------------------->
\ \ The user site cannot restart at this number for
\ \ some reason.
/ Resume Retrieve
/ ------------------------------------>
| Unsuccessful Terminate
\ <------------------------------------
\ The server site is unable or unwilling to restart the
\ transmission.
/ Retrieve at sequence number
/ ---------------------------------------->
| Data
| <----------------------------------------
\ The server agrees to resume at the user-chosen
\ point. The first data transaction is numbered
\ with the chosen sequence number.
/ Retrieve at sequence number
/ ---------------------------------------->
| Unsuccessful Terminate
| <----------------------------------------
|
| The server site will never permit restart for some
| reason.
| Retrieve at sequence number
| ---------------------------------------->
| Use this sequence number
| <-----------------------------------------
| / Acknowledge
| / ---------------------------->
| | Data
| | <----------------------------
| \ The user site agrees to use the
| \ server-chosen number. The first data
| \ transaction is numbered with the chosen
| \ number.
|
| or
|
| / Unsuccessful Terminate
| / ----------------------------->
| |
\ \ The server cannot use the user-chosen
\ \ number and the user cannot use the
\ \ server-chosen number. Therefore the attempt
\ \ to restart must be abandoned.
/ \
| PR [INTER] | _ _
| | | |
O [PEN] # < PU [NCH] >| (jobname) | [ =socket-number[ /host-name ]]
| | | |
| R [EADER] | | (*) |
\ / |_ _|
/ \
RJT # R [ECFM] (device) = < T [ELNET] >
| A [SA] |
| R [ECORDS] |
| C [OMPRESSED] |
\ /
+---------+ +--------+
! INPUT ! ! OUTPUT !
+--! routine !<------||---------! driver !<--+
! +---------+ +--------+ !
! ^ !
V ! !
+---------+---------+ +---------+ ! +---------+
! ! Graphic ! ! Graphic ! ! ! !
! PROCESS ! Data ! ! Data !<->! ! DISPLAY !
! ! Base ! ! Base ! ! ! !
+---------+---------+ +---------+ ! +---------+
! ! ^
! V !
! +---------+ +--------+ !
! ! OUTPUT ! ! INPUT ! !
+->! routine !-------||-------->! driver !---+
+---------+ +--------+
1. USER SERVER
---- ------
Set data type '02' (Network ASCII)
------------------------------------->
Store File X
------------------------------------->
File X (in Network ASCII)
------------------------------------->
End of File
------------------------------------->
Acknowledge
<-------------------------------------
Retrieve File X
------------------------------------->
File X in Network ASCII
<-------------------------------------
End of File
<-------------------------------------
2. USER SERVER
---- ------
Set data type'03' (EBCDIC)
------------------------------------->
Retrieve File Y
------------------------------------->
Set data type '00' ("bit-stream")
<-------------------------------------
File Y as stored (no conversion)
<-------------------------------------
End of File
<-------------------------------------
Set data type '02' (Network ASCII)
------------------------------------->
Retrieve File Z
------------------------------------->
File Z in Network ASCII
<-------------------------------------
End of File
<-------------------------------------
,---------------.
| |
| DCF' |
Sending | |
Host `---------------'
\ ^ /
\_____________|__________/
|
/ | ^
File / | |
Xfer / |
Protocol / DRS | |
/ Protocol |
/ | |
/ |
,----------. /\ ,---------./ /\ ,------------|--.
| | / \ | | / \ | |
| TELNET |---\ / ---| DCF |---\ / ---| DRS | |
| | \/ | | \/ | |
`----------' | |\ `------------|--'
^ `---------' \File |
| ^ | \Xfer DRS | |File
| | | \Protocol Protocol | Xfer
v | v \ | |Proto-
,----------. ,---------. \ | col
| USER | | | \ | |
| TERMINAL | | CATALOG | \ | v
| | | | \ _______________________
`----------' `---------' / | \
/ v \
Receiving ,---------------.
Host | |
| DCF' |
| |
`---------------'
RAND UCLA
________________ ________________
| PDP-10 | | 360/91 |
______ | | | |
| | | __________ | | __________ |
|File | | | RJS | | | | | |
|System|___|__| Access |__|___/\/\ Network /\____|__| RJS | |
| | | | Program | | \/ \/ | | | |
|______| | |__________| | | |__________| |
| | | | |
| | | | |
|_______|________| |________________|
|
|
User
TENEX 1.28,RAND EXEC 1.33.1 Rand Exec Prompt
@_LOGIN_ \
(USER) _HARSLEM_ \ User Logs In
(PASSWORD)______ /
(ACCOUNT #)_1__ /
JOB 12 ON TTY10 25-FEB-72 11:12 System Acknowledges
@_RJS_ User Starts RJS
Access Program
16 16
+----------+------------+
word 0 | Day # | Time |
+----------+------------+
| |
1 - 365 (6 on leap year) |______
|
Time in minutes at which sample was
started. Ranges from 0 (midnight) to 1439.
8 8
+--------+------+-------+----------+
word 1 | Source | Byte | N | Format |
| Host | Size | | |
+--------+------+-------+----------+
| | | |_____________
___________| | | |
| | | |
Network | | +-----+-----+--+--+--+--+
Host number | | | | |C |R |B |M |
| | +-----+-----+--+--+--+--+
| | | | | |
| | | | | message
| number of HOST | | | statistics
| related entries | | |
| in message | | |__byte
| | | statistics
| | |
number of bits per | |__average
byte in byte statistics | round-trip
| time
|
|__control
message
distribution
<-------32--------->
+---------------------+
| Foreign HOST # | always present
/ +---------------------+
| | messages received | if FORMAT bit M set
| +---------------------+
| | Bytes received | if FORMAT bit B set
N of these | +---------------------+
entries | | message sent | if FORMAT bit M set
| +---------------------+
| | Bytes sent | if FORMAT bit B set
| +---------------------+
\ | Average delay | if FORMAT bit R set
+---------------------+
This is average RFNM
delay in milliseconds
+---------------+ +---------------+
______ | UTAH | NETWORK | UCLA |
/ \ | +---------+ | | +---------+ |
+ + | | | | / / | | | |
|\______/| | | |>-|-------/ /------|->| | |
| |----+--| NETRJS | | : / / |: | RJS | |
| FILE | | | |<-|-----/ /--------|-<| | |
| SYSTEM | | | | | / / | | | |
\ / | +---------+ | | +---------+ |
\______/ | | | | |
+-------|-------+ +---------------+
1 UCLA SIGMA-7 Server # Limited Jon Postel
65 UCLA IBM-360/91 NETRJS now Bob Braden
(Telnet in April
2 SRI(NIC) PDP-10 Server John Melvin
66 SRI(AI) PDP-10 Server Len Chaiten
3 UCSB IBM-360/75 Server Jim White
4 UTAH PDP-10 Server Barry Wessler
*5 BBN(NCC) DDP-516 Never Alex McKenzie
69 BBN(TENEX-A) PDP-10 Server Dan Murphy
133 BBN(TENEX-B) PDP-10 Server(Exper.) Dan Murphy
6 MIT(Multics) H-645 Server Mike Padlipsky
70 MIT(DM) PDP-10 Server Bob Bressler
*134 MIT(AI) PDP-10 User Now Jeff Rubin
*7 RAND IBM-360/65 User Only Eric Harslem
71 RAND PDP-10 Server Eric Harslem
*8 SDC IBM-360/155 Server Bob Long
9 HARVARD PDP-10 Server Bob Sundberg
*73 HARVARD PDP-1 User Only Bob Sundberg
10 LINCOLN IBM-360/67 "Soon" Joel Winett
74 LINCOLN TX-2 Server Will Kantrowitz
11 STANFORD PDP-10 "Soon" Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 June Charles Rose
14 CARNEGIE PDP-10 "Soon" Hal VanZoeren
*15 AMES ILLIAC Server John McConnell
(B6500)
16 AMES IBM-360/67 "Soon" Wayne Hathaway
*144 AMES TIP User Only
*145 MITRE TIP User Only
*19 NBS PDP-11 User Only Robert Rosenthal
*147 NBS TIP User Only
*148 ETAC TIP User Only
*23 USC TIP User Only
*158 BBN TIP User Only
(Prototype)
_______________
*Host not included in daily testing.
#The NMC is a research site and would like
to have prior arrangement with each user.
1 UCLA SIGMA-7 Server # Limited Jon Postel
65 UCLA IBM-360/91 NETRJS now Bob Braden
(Telnet in April)
2 SRI(NIC) PDP-10 Server John Melvin
66 SRI(AI) PDP-10 Server Len Chaiten
3 UCSB IBM-360/75 Server Jim White
4 UTAH PDP-10 Server Barry Wessler
*5 BBN(NCC) DDP-516 Never Alex McKenzie
69 BBN(TENEXA) PDP-10 Server Dan Murphy
133 BBN(TENEXB) PDP-10 Server (Exper.) Dan Murphy
6 MIT(Multics) H-645 Server Mike Padlipsky
70 MIT(DM) PDP-10 Server Bob Bressler
*134 MIT(AI) PDP-10 User Now Jeff Rubin
*7 RAND IBM-360/65 User Only Eric Harslem
71 RAND PDP-10 Server Eric Harslem
*8 SDC IBM-360/155 Server Bob Long
9 HARVARD PDP-10 Server Bob Sundberg
*73 HARVARD PDP-1 Server Bob Sundberg
10 LINCOLN IBM-360/67 "Soon" Joel Winett
74 LINCOLN TX-2 Server Will Kantrowitz
11 STANFORD PDP-10 "Soon" Andy Moorer
*12 ILLINOIS PDP-11 User Only John Cravits
*13 CASE PDP-10 June Charles Rose
14 CARNEGIE PDP-10 "Soon" Hal VanZoeren
*15 AMES ILLIAC Server John McConnell
(B6500)
16 AMES IBM-360/67 "Soon" Wayne Hathaway
*144 AMES TIP User Only
*145 MITRE TIP User Only
*19 NBS PDP-11 User Only Robert Rosenthal
*147 NBS TIP User Only
*148 ETAC TIP User Only
USC IBM-360/44 "Soon"
*151 USC TIP User Only
*152 GWC TIP User Only
*158 BBN TIP User Only
(Prototype)
_____________________
*Host not included in daily testing.
#The NMC is a research site and would like to have prior arrangement
with each user.
+--------------------+ +----------+ +--------------------+
|HOST SND | | | |HOST RCV |
| | | | | |
| | | | | |
| (PROCESS) | +----------+ | |
| ( S ) | HOST | |
| \ | RNDZ | (PROCESS) |
| [DATA]| | ( R ) |
+--------------------+ +--------------------+
+-----------------------------------+
|HOST SND MSP _ _ _ |
| ------------->|_ _ _| |
| / ^ |_ _ _| <-|-------RENDEZVOUS
| / | |_ _ _| | TABLE
|(PROCESS) | |
|( S ) +-- SEND (from=S to=R; rend=RNDZ)
| \ |
| [DATA] |
+-----------------------------------+
HOST SND HOST RNDZ
+------------+ +---------------------------+
| MSP| "OUT" + DATA |MSP _____ RENDEZVOUS |
| |--------------------|--> |_ _ _| TABLE |
| | from=S; to=R | \ |_ _ _| |
| | | \ |_ _ _| |
+------------+ | \ __ |
| \---------->| | DATA |
| |__|BUFFER |
| |
+---------------------------+
HOST RNDZ HOST RCV
+------------------------+ +-----------------------+
| MSP | | MSP |
| TABLE _____ | | _____ TABLE |
| +-|_ _ _| | "IN" | |_ _ _| |
| | |_ _ _|<-|----------|_ _ _|<-\ |RECEIVE
| | |_ _ _| | | |_ _ _| \ <--|(from=S
| | | | \ | to=R
| _V_ | | \ | rend=RNDZ)
| BUFFER | | | | (PROCESS) |
| |___| | | ( R ) |
+------------------------+ +-----------------------+
HOST SND HOST RCV
+------------------+ +------------+ +-------------+
| | | TABLE | | |
| TABLE ___ | "IN" | ___ | "OUT" | ___ TABLE|
| |___| | | |___| | + DATA | |_ _| |
| |___|<---|--------|---|___|----|---------|->|_ _| |
| |___| | | |___| | | |_ _| |
| ( S ) | +------------+ | ( R )|
| | HOST RNDZ | |
+------------------+ +-------------+
------ _________ ------
( ) | | ( )
( ) SEND | | RECEIVE ( )
( )------>|--+ +---|<--------( )
( ) | \/ | ( )
( ) (IN) | /\ | (OUT) ( )
( )<------|--+ +--|-------->( )
(______) |_________| +DATA (______)
---- _______ ______ ----
( ) | | | | ( )
( ) SEND | | IN | | RECEIVE( )
( )------>|-+ +--|<------------|------|<-------( )
( ) | \/ | | | ( )
( ) (IN) | /\ | OUT+DATA | | (OUT) ( )
( )<------|-+ +--|------------>|------|------->( )
(____) |_______| |______| +DATA (____)
---- ______ _______ ----
( ) | | | | ( )
( ) SEND | | OUT+DATA | | RECEIVE( )
( )------>|------|------------->|-+ +--|<-------( )
( ) | | | \/ | ( )
( ) (IN) | | IN | /\ | (OUT) ( )
( )<------|------|<-------------|-+ +--|------->( )
( ) | | | | +DATA ( )
(____) |______| |______ | (____)
---- ______ _______ ______ ----
( ) | | | | | | ( )
( ) SEND | | OUT+DATA | | IN | |RECEIVE( )
( )------>|------|--------->|-+ +--|<---------|------|<------( )
( ) | | | \/ | | | ( )
( ) (IN) | | IN | /\ |OUT+DATA | | (OUT) ( )
( )<------|------|<---------|-+ +--|--------->|------|------>( )
( ) | | | | | | +DATA ( )
(____) |______| |______ | |______| (____)
|<---- Host K ----->|<--Net-->|<-Host->|<--Net-->|<----- Host L ----->|
M
+-------------+
| | ////////// = unused
| | //////////
+-------------+
8 bits
0 8 16 24 32 36
+-------------+-------------+-------------+-------------+------+
0 | HOST/IMP | FOREIGN | LINK | ////////////////// |
| FLAGS | HOST | | ////////////////// |
+------+------+-------------+-------------+-------+-----+------+
1 | //// | TO PORT ID | MESSAGE |
| //// | | TYPE |
+------+------+-------------+-------------+-------------+------+
2 | FROM PORT ID | TABLE | //// |
| | POSITION | //// |
+------+-------------+-------------+------+-------------+------+
3 | //// | SOURCE | RENDEZVOUS | BIT COUNT |
| //// | HOST | HOST | |
+------+-------------+-------------+---------------------------+
| |
4 | |
// DATA //
| |
| |
+-------------+-------------+-------------+-------------+------+
+------+--//---+------+------+--//---+------+------+-------+-------+
|char 0| 1// n | null |char 0| 1// n | null | port | number| delay |
| | // | | | // | | | |spec |
+------+--//---+------+------+--//---+------+------+-------+-------+
\ /\ /\ /\ /
\_________________/ \___________________/ \___________/ \____/
PARAMETER 1 PARAMETER 2 PARAMETER 3 PARAMETER
4
Parameters given:
+-------------------------------------+
| Full ASCII |
| a b ... z | ` ^ { } ~ |
| |
+-----+-------------------------------------+--------------+
|33/35| | AT&T TWX |
| | ` [ ] | (Mod 33/35 |
| | | tty) |
+------+-----+------+-----------------------+ | |
|Basic | | | | | |
|EBCDIC| | | <SP> | | |
| | | " | A B ... Z | | <left arrow> |
| | | ! | 0 1 ... 9 | | |
| | | | + - * / ( ) | | <up arrow> |
| | | | . , ' = | | |
| | | | $ & | | |
| | | | < > : ? % # @ | | |
| | | | | | |
| +-----+------+-----------------------+------+--------------+
| | | | |
| | | _ | |
| | | | |
| +------+-----------------------+------+
| | |
| | PL/1 <bent bar> | |
| | Set |
| +-----------------------+
| <cent sign> |
| Basic EBCDIC |
+-------------------------------------------+
TELNET
connections
File Server Server<------------ User User File
Systems<-> FTP <->TELNET FTP Commands TELNET<->FTP <->System
Process ------------> Process
Data
<------------------------------>Socket
Data Connection(s) |
|
USER
ftp (host) multics CR ICP to HOST S, socket 3,
establishing TELNET connections.
username Doe CR USER DoeCRLF ---->
<---- 330 passwordCRLF
password mumble CR PASS mumbleCRLF ---->
<---- 230 Doe logged in.CRLF
retrieve (local type ASCIICR
(local pathname) test 1 CR USER-FTP open local file in ASCII.
(for. pathname) test.pl1CR RETR test.pl1 CRLF ---->
<---- 255 SOCK 1233CRLF
Server makes data connection to (U+4).
<---- 250 File transfer startsCRLF
<---- 252 File transfer completeCRLF
type imageCR TYPE |CRLF ---->
<---- 200 Command OKCRLF
byte 36CR BYTE 36CRLF ---->
<---- 200 Command OKCRLF
store (local type) ImageCR
(local pathname) file dumpCR User-FTP opens local file in Image.
(for. pathname) >udd>cn>fdCR STOR >udd>cn>fdCRLF ---->
<---- 451 Access deniedCRLF
terminate BYECRLF
<---- 231 Doe logged outCRLF
Server closes all connections.
-------------------------------------------------------------------
SITE | RELIABILITY| RESPONSE | FRIENDLINESS | # HOURS | COMMENTS |
| | | | USED | |
-----|------------|----------|--------------|----------|----------|
| | | | | |
| | | | | |
% State
+--------+-------------------------------------------+
| | Unable to Log in to any site. |
|--------|-------------------------------------------|
| | Unable to Log in to Desired site. |
|--------|-------------------------------------------|
| | Foreign site suddenly crashes. |
|--------|-------------------------------------------|
| | Local site crashes. |
|--------|-------------------------------------------|
| | Trouble free operation. |
|--------|-------------------------------------------|
| | Other |
+--------+-------------------------------------------+
-1 -2 -3 -16 0 -1 -2 -15
-2 2 2 ... ...2 -2 2 2 ... 2
+--+--+--+--+---------+--+--+ +--+--+--+--+---------+--+--+
| | | | | | | | | | | | | | | |
+--+--+--+--+---------+--+--+ +--+--+--+--+---------+--+--+
^ ^
+--+--+--+--+--+--+-----------------+--+--+--+--+
| | | | | | | ... ... | | | | |
+--.--+--+--+--+--+-----------------+--+--+--+--+
Bit position 0 1 2 3 ...... 14 15
16 16
+----------+------------+
word 0 | Day # | Time |
+----------+------------+
| |
1 - 365 (6 on leap year) |______
|
Time in minutes at which sample was
started. Ranges from 0 (midnight) to 1439.
8 8
+--------+------+-------+----------+
word 1 | Source | Byte | N | Format |
| Host | Size | | |
+--------+------+-------+----------+
| | | |__________
_______| | | |
| | number of HOST |
Network Host | related entries +---+---+---+---+---+---+
number | in message | | | C | R | B | M |
| +---+---+---+---+---+---+
number of bits per | | | |
byte in byte statistics ____ ____| | | message
| ___| | statistics
| | byte
control | statistics
message distribution |
average
round-trip time
SUN.&
HOLIDAYS MON. TUES. WED. THURS. FRI. SAT.
0000+--------+-------+-------+-------+-------+--------+-------+
| | | | | | | |
| | | Z | | | | |
| | Z | | Z | Z | | |
0400| Z | +-------+ +-------+ Z | Z |
| | | | | | | |
0600| +-------+ +-------+ +--------+ |
0700| | R | * | R | * | R +-------+
0800+--------+-------+-------+-------+-------+--------+ R |
| | | | | | | |
1000| | | | | | +-------+
| | | | | | | |
| | | | | | | |
| R | M | M | M | M | M | M |
| | | | | | | |
| | | | | | | |
| | | | | | | |
1700+--------+-------+-------+-------+-------+--------+-------+
| | | | | | | |
| | | | | | | R |
2000| Z | R | R | R | R | R +-------+
| | | | | | | |
2200| | | | | | | Z |
| | | | | | | |
2400+--------+-------+-------+-------+-------+--------+-------+
(a) ______ for authentication ______
| | | | |
| |<-----------+------------->| User |
|______| | / |______|
Host |/
X
/|
_______ / |
| | / v
| |<---
|_______|
Authenticator
(b)
______ ______
| | | |
| |<--\ ^ /-->| User |
|______| \ | / |______|
Host \ | /
------------+--/
| /
|/
|
/|
/ |
/ | authentication
_______ / | complete
| | /
| |<------
|_______|
Authenticator
NY Terminal NY Enroute Boston Enroute Boston Terminal
_____ _____ _____ _____
| | / | | \ | | | |
|Host1|<----/--->|Host2|<---\---->|Host3|<----->|Host4|
|_____| \ / |_____| \ / |_____| |_____|
X move X
/ \ | / \
| \ V / |
V \ _____ / V
reconnect \ | | / reconnect
->|Host5|<-
|_____|
NY Enroute
H2 H3 H2 H3
___ ___ ___ ___
| | | | | | | |
| C|<-+ |D | | C|<------>|D |
|___| | |___| |___| |___|
|
|
| ___ ___
| | | | |
+->|A | |A |
|___| |___|
H1 H1
H2 H3
______ ______
| | | |
| C | | D |
---\-- -/----
\ /--> <--\ /
\- -/--- --- --- --- --- \---/
\ / \ /
X X
/ \ / \
/ \ / \
reconnection \ / reconnection
\ ________ /
---|A B|---
| |
|________|
H1
H1 H4 H1 H4
____ ____ ____ ____
| | | | | | | |
| C| |E | | C|--------|E |
|____| |____| |____| |____|
H2 H3 H2 H3
____ ____ ____ ____
| | | | | | | |
| B|--------|D | | B| |D |
|____| |____| |____| |____|
___ ___
| P |---------------| Q |
|___| |___|
____________________
| P --> Q || R R Q |
|_________||_________|
|
+---------+
|
____V_______________________________________
| || | | |
| Q --> P || R O K | R N O ----| R R Q |
| || | | E | |
|_________||_________|_________|___|_________|
| |
+------------+ v
| Yes +----------+ No
| +------------------------| NP > NQ? |------+
| | +----------+ |
__v___v_______________________________ |
| || | | |
| P --> Q || R D O ----| R N O ----| |
| || | E | | E | |
|_________||_________|___|_________|___| |
|
+--------------------------------------------+
|
____v_________________________________
| || | |
| Q --> P || R D O ----| R N O ----|
| || | E | | E |
|_________||_________|___|_________|___|
H2 H3 H2 H3
___ ___ ___ ___
| | | | | C|--------|D |
|_C_| |_D_| |___| |___|
| |
| | ===>
| ____ | ____
---|A B|--- | |
|____| |____|
H1 H1
<------------------<
A Process 1 Process 2
>------------------>
neither end echoes
<------------------<
B Process 1 <--+ Process 2
^
>--^--------------->
one end echoes for itself
<------------------<
C Process 1 <--------------+ Process 2
^
>--------------^--->
one end echoes for the other
<--------------V---<
D Process 1 <--+ V Process 2
^ +--->
>--^--------------->
both ends echo for themselves
<-----V------------<
E Process 1 <--+ V Process 2
^ +------------>
>--^--------------->
one end echoes for both ends
H-> I line
----------> First packet of multipacket
arrives. Halt H->I line and
send REQ (8) -------------->
start 30 sec. Time-out
If time-out, resend
REQ (8) and restart -------->
time-out.
<--------ALL (8) when available. Start
long term (2 min.) time-out.
On time-out, reset all
outstanding reservations.
P A
O C
E K
+-------+-----+------------------------+-----+----------+
typical packet | | | | | |
| | | | | |
+-------+-----+------------------------+-----+----------+
IMP A IMP B
----- -----
ROE | SOE ROE | SOE
| POE ACK |
| +-----------+ |
IMP A blocks send 1 | 0 (1)| 0 1 |-> 1 | 0 IMP B NOPS,
channel. | +-----------+ | flips ROE
| |
| POE ACK |
| +-----------+ |
IMP A frees send 0 | 1 <-| 0 0 |(2) 0 | 0 IMP B blocks
channel, | +-----------+ | channel for
Flips SOE | | new traffic
| POE ACK |
IMP A blocks send | +-----------+ crashes|
channel | (3)| 1 0 |->or gets|
| +-----------+ lost |
| |
| POE ACK |
IMP A detects packet | +-----------+ |
duplicate (POE=ROE) 0 | 1 <-| 0 0 |(2) 0 | 0 IMP B
so does not change | +-----------+ | retransmits no
SOE bit. | | ACK received
| POE ACK |
IMP A retransmits | +-----------+ | IMP B flips
packet 3 | (3)| 1 0 |-> 1 | 1 SOE, unblocks
| +-----------+ | channel, and
| | flips ROE.
| POE ACK |
IMP A flips ROE, | +-----------+ |
flips SOE 1 | 0 <-| 1 1 |(4) |
| +-----------+ |
| |
start state F = free
| I = in use
V X = don_t care
+-----+ +------+ N = new packet
| FX | --------------> | I, N | O = old packet
+-----+ +------+
^ |
| |
| |
| |
ACK | |
received | |
| V
| +------+
+-------------------| I, O |---+
+------+ |
^ | re-transmissions
+------+
TELNET
Connections
+-----+ +-------+ +------+ +------+ +-------+ +-----+
| File|<->|Server-|<->|Server|<----------|User |<->|User- |<->|File |
|Sys | |FTP | |TELNET| FTP Cmds |TELNET| |FTP | |Sys- |
| -tem| |Process| | |---------->| | |Process| | tem |
+-----+ | | +------+FTP Replies+------+ | | +-----+
| | | |
| |<------------------------------->|Data |
| | Data Connection(s) |Socket |
+-------+ +-------+
|
|
+------+
| |
| USER |
| |
+------+
Integral data bytes >= 24
+---------------+---------------+--------------+
| Don't care | Descriptor | Byte Count |
| 0 to 231 bits | 8 bits | 16 bits |
+---------------+---------------+--------------+
Two 7-bit bytes
+----------+------------+
| | Marker Char|
| | 8 bits |
+----------+------------+
+-------------+-------------+---------------+
| Don't care | Descriptor | |
| 12 bits | code=4 | Byte count=2 |
+-------------+-------------+---------------+
+----+---------+---------+--------+---------+
| | Marker | Marker | Marker | Marker |
| | 8 bits | 8 bits | 8 bits | 8 bits |
+----+---------+---------+--------+---------+
+----+---------+---------+--------+---------+
| | Marker | Marker | SP | SP |
| | 8 bits | 8 bits | 8 bits | 8 bits |
+----+---------+---------+--------+---------+
STRU F | R
+-------------------------------+-----+-----+------+
TYPE |\ MODE | | | |
| \ | | | |
| \ S T B | S | T | B |
| FORM +--------+-----+---------+-----+-----+------+
A | U | 8 | 8 | 8 | 8 | 8 | 8 |
| +--------+-----+---------+-----+-----+------+
| P | 8 | 8 | 8 | 8 | 8 | 8 |
----+------+--------+-----+---------+-----+-----+------+
E | U | 8 | | 8 | 8 | | 8 |
| +--------+-----+---------+-----+-----+------+
| P | 8 | | 8 | 8 | | 8 |
----+------+--------+-----+---------+-----+-----+------+
I | U | 1-255 | | 1-255 | | |1-255 |
----+------+--------+-----+---------+-----+-----+------+
L | U | 1-255 | | 1-255 | | |1-255 |
----+------+--------+-----+---------+-----+-----+------+
ftp (host) multics CR ICP to HOST S, socket 3,
establishing TELNET connections.
username Doe CR USER Doe CRLF ---->
<---- 330 password CRLF
password mumble CR PASS mumble CRLF ---->
<---- 230 Doe logged in. CRLF
retrieve (local type) ASCII CR
(local pathname) test 1 CR User-FTP opens local file in ASCII.
(for.pathname) test.p11 CR RETR test.p11 CRLF
<---- 255 SOCK 1233 CRLF
Server makes data connection to (U+4).
<---- 250 File transfer starts CRLF
<---- 252 File transfer complete CRLF
type ImageCR TYPE I CRLF ---->
<---- 200 Command OK CRLF
byte 36CR BYTE 36 CRLF ---->
<---- 200 Command OK CRLF
store (local type) image CR
(local pathname) file dump CR User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd CR STOR >udd>cn>fd CRLF ---->
<---- 451 Access denied CRLF
terminate <---- 231 Doe logged out CRLF
Server closes all connections.
8 8
+-----------+-----------+
| RCS | link | Reset connection by sender
+-----------+-----------+
8 8
+-----------+-----------+
| RCR | link | Reset connection by receiver
+-----------+-----------+
n bytes of data
/--------/\--------\
1 B-1 / B B \
+---+------+ +--------+ +--------+
Byte String: | 0 | n | | d |. . .| d |
| | | | 1 | | n |
+---+------+ +--------+ +--------+
String of n data bytes d(1),...,d(n)
Count n must be positive
2 B-2 B
+----+------+ +---------+
Replicated Byte: | 1 0| n | | d |
+----+------+ +---------+
String consisting of n replications of the data byte d
2 B-2
+----+------+
Filler String: | 1 1| n |
+----+------+
String of n filler bytes. The filler byte is a "space"
character for ASCII or EBCDIC type, or a binary zero
byte for Image or Local Byte Type.
B B
+----------+ +----------+
Control Escape Sequence: | 0......0 | | C | (see below)
+----------+ +----------+
+---------------+
| |
+----------| USER PROCESS |----------+
| | A | |
telnet +---------------+ telnet
| |
| |
+-----------+ +-------------+
| |--------> --------->| |
| SERVER |data sockets data socket| SERVER |
| B | Sb Sc | C |
| |<-------- <---------| |
+-----------+ +-------------+
USER A TO SERVER B USER A TO SERVER C
__________________ __________________
8 8 8 8
+-------+-------+--------+--------+
| GVB | link | f =255 | f =255 |
| | | m | b |
+-------+-------+--------+--------+
8 8 16 32
+------+------+-----------+-----------+
| RET | link | msg space | bit space |
+------+------+-----------+-----------+
__ __
| |
| ;D[DOCUMENT] |
| ;M[MESSAGE] |
<userid> | ;C[COPIES]= <integer> |
| ;BIN= <integer> |
|__ __|
UCSB UCLA
|------------------------------------------| |-----------------|
+--------+ +-------+ +-------+
| | | | | |
| | 500 Kb/s | | | |
|SEL810-B| +------+ | +------+ |IBM | |IBM |
| |<-|INTER-|<->|INTER-|->|360/75 | |360/91 |
| |->|FACE | |FACE |<-| | | +----+|DISCARD
| | +------+ +------+ | | | | NCP|-->+----+
| | | | | +----+| | |
+--------+ +---^---+ +----^--+ +----+
| | |<--100 Kb/s--> | |
V V | V |
+-----+ +-----+ +-----+
| D/A | | IMP |<---/ /<---| IMP |
+-----+ | |--->/ /--->| |
| +-----+ \ / +-----+
-|\ | \ /
-| \<-+ 50 Kb/s
-| /
-|/SPEAKER
Figure 1. Hardware configuration of data path used
for sending real-time data from the
SEL 810-B to the UCLA host discard socket.
..........
|----|----|----|----|-----------|----|----|----|----|
^ 1 2 3 4 n-4 n-3 n-2 n-1 ^
| |
0 n
B E
+--------+ +--------+ +---------+
| IMP 2|--------|3 IMP 4|--------|5 IMP |
| 1 | | | | 6 |
+---|----+ +--------+ +----|----+
| |
+---|----+ +----|----+
| | | |
| Host | | Host |
+--------+ +---------+
-------------
!/---------\!
!! User !! --------
!!Interface!<--->! User !
!\----:----/! --------
---------- ! V !
!/------\! FTP Commands !/---------\!
!!Server!<-----------------! User !!
!! PI !----------------->! PI !!
!\--:---/! FTP Replies !\----:----/!
! V ! ! V !
-------- !/------\! Data !/---------\! --------
! File !<--->!Server!<---------------->! User !<--->! File !
!System! !! DTP !! Connections !! DTP !! !System!
-------- !\------/! !\---------/! --------
---------- -------------
TELNET ------------ TELNET
-----------! User-FTP !------------
! -------->! User-PI !<--------- !
! ! ! "C" ! ! !
V ! ------------ ! V
-------------- --------------
! Server-FTP ! Data Connection ! Server-FTP !
! "A" !<-----------------------! "B" !
-------------- Socket(A) Socket(B) --------------
ftp (host) multics<CR> ICP to Host S, socket 3,
establishing TELNET connections
<---- 330 Awaiting input <CRLF>
username Doe <CR> USER Doe<CRLF>---->
<---- 330 password<CRLF>
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 Doe logged in.<CRLF>
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for.pathname) testp11<CR> RETR test.p11<CRLF> ---->
Server makes data connection to
(U+4)
<---- 250 File transfer starts
<CRLF>
<---- 252 File transfer
complete<CRLF>
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
byte 36<CR> BYTE 36<CR>LF ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 451 Access denied<CRLF>
terminate BYE <CRLF> ---->
Server closes all connections.
Weekday Hourly Load Averages
July 1973
^ B BBN-TENEX
| I ISI-TENEX
10 +
|
| B
|
+
|
|
|
+ B
Load |
Avg. | B
| I
+
|
|
| *
+ I
|
| B I B
| B
5 +
|
| B I
| I
+ I
|
|
| B
+ I B
| B
| I
| I I B B
+ I
| I B I
| B
| B I B
+ I I I
| B * B
| * * I I *
| B B
---+--+-----------+-----------+-----------+-----------+>
| 0-1 AM 6-7 AM 12-1 PM 6-7 PM 12
(midnight) (noon) (midnight)
Time of Day (Eastern Daylight Time)
SPECIAL PACKET BIT ___
|
|
___HELLO/I-HEARD-YOU BIT | ___ UNUSED __
| | | |
| | | |
V V V V
_______________________________________________________________
| | | | | |///////| | |///| |
| | | | | |///////| | |///| |
|___|___|___|___|___|___|___|___|___|___|///|///|___|___|///|___|
^ ^ PACKET WORD COUNT ^ ^ ^ ^
| | ( 6 BITS ) | | | |
| | | | | CHANNEL
| | | | | NUMBER
| | | | |
| PACKET HOST/IMP BIT | CHANNEL ZERO
| ODD/EVEN BIT | ACKNOWLEDGE BIT
| |
LAST PACKET BIT CHANNEL ONE
ACKNOWLEDGEMENT BIT
--+--2.0
|
|
| +++ (3)
| ++++
| ++
| +
| ++
ooo **** --+-- ooo ***+
o o** ** | o o** + **
o *o * | o *o + *
o * * | o * + *
o * o * | o * o *
* o * | * + o *
o ** ** |o ** ++ **
| * | o * | * ++ o | * (1) |
|-------**-------+-----------+++++o+++++-----------+-------**-------|
|-4.0 | o ++ | o | (2) |4.0
++ o| o
o + | o
o o | o o
+ o | o
+ o o | o o
+ o o | o o
+ ooo --+-- -1.0 ooo
++ |
+ |
++ |
++++ |
+++ |
|
|
--+-- -2.0
Data from Plasma
|Msb|x|x|x|x|x|x|x|x|Lsb|P| <----------------
| | | | | | | | | | * Terminal
| | | | | \ \ \ \ \ Parity for Keyboard
| | | | | \ \ \ \ \ data is regenerated
| | | | | \ \ \ \ \ at the PLATO System
| | | | | \ \ \ \ \ end.
| | | | | \ \ \ \ \
/ / / / / \ \ \ \ \
/ / / / / \ \ \ \ \
Data to | | | | | | | | | |
<-------- |x|x|x|x|x|1|1|0|<--|x|x|x|x|x|1|0|0|
Network
_____________________________________
| | / /
| ______ ___________ | \ \
| | |---| | | / /
| | | | DATA | | \ \
| | | |DESCRIPTION| _______ | DATALANGUAGE ___________
| | | |___________| | |<-------------------->| |
| |STORED| |________| USER | | PATH |APPLICATION|
| | DATA |__________________|REQUEST| | | PROGRAM |
| | | |_______|<----!--------------->|___________|
| | | ___________ | ! DATA PATH
| | | | | | ! / /
| | | | PORT |-----! \ \
| | | |DESCRIPTION| | / /
| |______| |___________| | \ \
|_____________________________________| / /
NETWORK
Figure 2-1
A Model of Datacomputer/User Interaction
___________________________________________ _______________
| ____________ | | ___________ |
| |APPLICATION | | | |APPLICATION| |
| _| DATA |_|____|_| PROGRAM | |
| | |DESCRIPTIONS| | | |___________| |
| | |____________| | |_______________|
| | ^ | HOST 1
| ______ | | |
| | | | _____|______ |
| | | | | DATA | |
| | | | | FUNCTIONS | |
| | | | |____________| | _______________
| | | ___________ | ____________ | | ___________ |
| | | | STORED |__| | | | | |APPLICATION| |
| | |__| DATA |____| |_|____|_| PROGRAM | |
| |STORED| |DESCRIPTION|__ | | | | |___________| |
| | DATA | |___________| | |____________| | | |
| | | ^ | ____________ | | ___________ |
| | | | | | | | | |APPLICATION| |
| | | _____|_____ | | |_|____|_| PROGRAM | |
| | | | DATA | |_| | | | |___________| |
| | | | FUNCTIONS | |____________| | |_______________|
| |______| |___________| | HOST 2
|___________________________________________|
DATACOMPUTER
| _______
| |____
| __|GENERAL|____
| | DMS |____
| | |_______|
_________ ________ _________ |
| | | HIGHER | | |__| _______ ________
|PRIMITIVE|___| LEVEL |___|LOW-LEVEL|_____|COBOL | | COBOL |
|LANGUAGE | |LANGUAGE| | SYNTAX |__ |SERVER |___|PROGRAM |
|_________| |________| |_________| | |_______| |________|
| | _______
|__|ON LINE|
| | QUERY |_______
|_______| |
| ___|____
|TERMINAL|
| | USERS |
|________|
|
APPLICATION APPLICATIONS
| SERVERS
_________________
| |
| _____________ |
| | X | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | STRING | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| "ABC" |
/|____________|
VALUE
_________________
| |
| _____________ |
| | Y | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | BOOL | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| TRUE |
/|____________|
VALUE
_________________
| _____________ |
| | SMITH | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
___________V_____
| _____________ |
| | X | |
| |_____________| |
| NAME | _________________
| _____________ | | _____________ |
_____|_|____ | | | | Y | |
| | |_____________| | | |_____________| |
| | DESCRIPTION | | NAME |
| | _____________ | | _____________ |
| __|_|____ | | | | ____|_|_____
| | | |_____________| | | |_____________| | |
| | | VALUE | | DESCRIPTION | |
| | | _____________ | | _____________ | |
| | | | ____|_|_____\| | ____|_|__ |
| | | |_____________| | /| |_____________| | | |
| | | SIBLING | | VALUE | | |
| | |_________________| |_________________| | |
| | OBJECT OBJECT | |
| | _________________ _________________ | |
| |_\| "ABC" | | FALSE |/_| |
| /|_________________| |_________________|\ |
| VALUE VALUE |
| _________________ _________________ |
| | _____________ | | _____________ | |
| | | STRING | | | | BOOL | | |
|____\| |_____________| | | |_____________| |/____|
/| TYPE | | TYPE |\
|_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________ _________________
| _____________ | | _____________ |
| | R | | | | STRUCT | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | ____________V____
| | VALUE | | _____________ |
| | _____________ | | | STRING | |
| | | | | | |_____________| |
| | |_________|___| | ___\| TYPE | _____________
| | CHILD | | | /| _____________ | | _________ |
| |___________|_____| | | | ____|_|______\| | STRING | |
| OBJECT | | | |_____________| | /| |_________| |
| | | | SIBLING | | TYPE |
| ___________V_____ | |_________________| |_____________|
| | _____________ | | DESCRIPTION DESCRIPTION A
| | | A | | | |
| | |_____________| | | _________________ |
| | NAME | | | _____________ | |
| | _____________ | | | | B | | |
| | | ____|_|__| | |_____________| | |
| | |_____________| | | NAME | |
| | DESCRIPTION | | _____________ | |
| | _____________ | | | ____|_|___________________|
| __|_|____ | | | |_____________| |
| | | |_____________| | | DESCRIPTION |
| | | VALUE | | _____________ |
| | | _____________ | | | ____|_|____
| | | | ____|_|______\| |_____________| | |
| | | |_____________| | /| VALUE | |
| | | SIBLING | | _____________ | |
| | |_________________| | | | | |
| | OBJECT | |_____________| | |
| | | SIBLING | |
| | |_________________| |
| |__________ OBJECT _____________|
| _______|__________________________|_______
|____\| _____V_______ _______V_____ |
/| | "ABC" | | FALSE | | Figure 4-3
| |_____________| |_____________| | A STRUCT with
|__________________________________________| two members
_________________
| _____________ |
| | L | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | LIST | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | | ________ |
| | | | | | | |
| |_______|_____| | | |______|_| |
| VALUE | | | CHILD | |
|_________|_______| |________|___|
OBJECT | DESCRIPTION |
| |
_________V_______ ________V___
| | | ________ |
| _____________ | | | STRING | |
| | "ABC" | | | |________| |
| |_____________| | | TYPE |
| _____________ | |____________|
| | "XY" | | DESCRIPTION
| |_____________| |
| _____________ |
| | "ZLM" | |
| |_____________| |
| : |
| : |
| _____________ |
| | "BBBF" | |
| |_____________| |
|_________________|
VALUE
_________________
| |
| _____________ |
| | STAR | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
|
|
|
V
_________________
| |
| _____________ |
| | BLOCK | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
|
|
___________V_____
| |
| _____________ |
| | TOP/LEVEL | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | ____|_|___ DESCRIPTION
| |_____________| | |
| SIBLING | |
| _____________ | |___\ ALL BLOCKS AND
| | | | / LOCAL T/OBJECTS
| |_________|___| |
| CHILD | |
|___________|_____|
|
|
V
_________________ _________________
| | | |
| _____________ | | _____________ |
| | | | | | | |
| | X | | | | Y | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_______|_____| | | |_______|_____| |
| VALUE | | | VALUE | |
|_________|_______| |_________|_______|
OBJECT | OBJECT |
| |
_________V_______ _________V_______
| | | |
| "ABC" | | "DEF" |
|_________________| |_________________|
VALUE VALUE
_________________ _________________
| | | |
| _____________ | | _____________ |
| | | | | | | |
| | X | | | | Y | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_______|_____| | | |_______|_____| |
| VALUE | | | VALUE | |
|_________|_______| |_________|_______|
OBJECT | OBJECT |
| |
_________V_______ _________V_____
| | | |
| "DEF" | | "DEF" |
|_________________| |_________________|
VALUE VALUE
_________________ _________________
| | | _____________ |
| _____________ | | | | |
| | L | | | |_____________| |
| |_____________| | | TYPE |
| NAME | | _____________ |
| _____________ | | | | |
| | ____|_|______\| |__________|__| |
| |_____________| | /| CHILD | |
| DESCRIPTION | |____________|____|
| _____________ | DESCRIPTION |
| | | | |
| |_________|___| | ____________V____
| VALUE | | | _____________ |
|___________|_____| | | STRING | |/___
OBJECT | | |_____________| |\ |
| | TYPE | |
___________V_____ |_________________| |
| | DESCRIPTION |
| _____________ | |
| | "ABC" | | _________________ |
| |_____________| | | | |
| _____________ | | _____________ | |
| | "XY" | | | | M | | |
| |_____________| | | |_____________| | |
| _____________ | | NAME | |
| | "ZLM" |/|___ | _____________ | |
| |_____________|\| | | | ____|_|____|
| : | | | |_____________| |
| : | | | DESCRIPTION |
| _____________ | | | _____________ |
| | "BBBF" | | |___|_|____ | |
| |_____________| | | |_____________| |
|_________________| | VALUE |
VALUE |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | L | | | | | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
| | | |/__ DESCRIPTION |
| |_________|___| |\ | ____________V____
| VALUE | | | | _____________ |
|___________|_____| | | | STRING | |/___
OBJECT | | | |_____________| |\ |
| | | TYPE | |
___________V_____ | |_________________| |
| _____________ | | DESCRIPTION |
| | "ABC" | | | _________________ |
| |_____________| | | | | |
| _____________ | | | _____________ | |
| | "XY" | | |___|_|____ | | |
| |_____________| | | |_____________| | |
| _____________ | | LIST | |
| | "ZLM" | | | _____________ | |
| |_____________| | | | | | |
| : | | |_________|___| | |
| : | | MEMBER | | |
| _____________ | | : | | |
| | "BBBF" |/|___ | : | | |
| |_____________|\| | |___________|_____| |
|_________________| | OPD | |
VALUE | ___________V_____ |
| | _____________ | |
| | | M | | |
| | |_____________| | |
| | NAME | |
| | _____________ | |
| | | ____|_|____|
| | |_____________| |
| | DESCRIPTION |
| | _____________ |
|___|_|____ | |
| |_____________| |
Figure 4-9 | VALUE |
OPD, LIST and member |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | F | | | | STRUCT | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
| | | | DESCRIPTION |
| |___________|_| | ____________V____ _________________
| VALUE | | | _____________ | | _____________ |
| ___________|_ | | | STRING | | | | STRING | |
| | | | | | |_____________| | | |_____________| |
| |_________|_|_| | | TYPE | | TYPE |
| CHILD | | | | _____________ | | _____________ |
|___________|_|___| ____\| | | | | | | |
OBJECT | | | /| |_____________| | | |_____________| |
| | | | SIBLING | | SIBLING |
| | | |_________________| |_________________|
| | | DESCRIPTION DESCRIPTION A
| | | ______________________________________ |
| | | | ____________ ____________ | |
| | | | | "ABC" | | FALSE | | |
| |_____|_____| |____________| |____________| | |
| | |________A_____________________________| |
| | ............: VALUE |
___________V_____ | : _________________ |
| _____________ | | : | _____________ | |
| | A | | | : | | B | | |
| |_____________| | | : | |_____________| | |
| NAME | | : | NAME | |
| _____________ | | : | _____________ | |
| | ____|_|_| : | | ____|_|_______________________|
| |_____________| | : | |_____________| |
| DESCRIPTION | : | DESCRIPTION |
| _____________ | : | _____________ |
| | ....|.|....: | | | |
| |_____________| | | |_____________| |
| VALUE | | VALUE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |_____________| |
| SIBLING | | SIBLING |
|_________________| |_________________| Figure 4-10
OBJECT OBJECT Effect of GET/STRUCT/MEMBER
_________________
| _____________ |
| | L | |
| |_____________| |
| NAME |
| _____________ |
| | LIST | |
| |_____________| |
| TYPE |
| _____________ |
| | | |
| |________|____| |
| CHILD | |
|__________|______|
DESCRIPTION |
|
__________V______
| _____________ |
| | M | |
| |_____________| |
| NAME |
| _____________ |
| | STRING | |
| |_____________| |
| TYPE |
| _____________ |
| | _________ | |
| | | FIXED | | |
| | |_________| | |
| | _________ | |
| | | 3 | | |
| | |_________| | |
| |_____________| |
| PARAMETERS |
|_________________|
DESCRIPTION
_________________
| _____________ |
| | R | |
| |_____________| |
| NAME |
| _____________ |
| | STRUCT | |
| |_____________| |
| TYPE |
| _____________ |
| | | |
| |_________|___| |
| CHILD | |
|___________|_____|
DESCRIPTION |
|
___________V_____
| _____________ |
| | A | |
| |_____________| |
| NAME |
| _____________ |
| | STRING | |
| |_____________| |
| TYPE | _________________
| _____________ | | _____________ |
| | | | | | B | |
| |_____________| | | |_____________| |
| PARAMETER | | NAME |
| _____________ | | _____________ |
| | ____|_|______\| | BOOL | |
| |_____________| | /| |_____________| |
| SIBLING | | TYPE |
|_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________
| |
| _____________ |
| | X | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | DIR | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| CHILD | |
|___________|_____|
OBJECT |
|
|
___________V_____
| |
| _____________ |
| | Z | |
| |_____________| |
| NAME | ____________
| _____________ | | ________ |
| | ____|_|______\| | OPD | |
| |_____________| | /| |________| |
| DESCRIPTION | | TYPE |
| _____________ | |____________|
| | | | DESCRIPTION
| |_________|___| |
| VALUE | | ____________
|___________|_____| | |
OBJECT |____________\| |
/|____________|
OPD
_________________
| _____________ |
| | X | |
| |_____________| | _________________
| NAME | | _____________ |
| _____________ | | | DIR | |
| | ____|_|______\| |_____________| |
| |_____________| | /| TYPE |
| DESCRIPTION | |_________________|
| _____________ | DESCRIPTION
| | | |
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
___________V_____
| _____________ |
| | Y | |
| |_____________| | _________________
| NAME | | _____________ |
| _____________ | | | BOOL | |
| | ____|_|______\| |_____________| |
| |_____________| | /| TYPE |
| DESCRIPTION | |_________________|
| _____________ | DESCRIPTION
| | | |
| |_____________| |
| VALUE |
| _____________ |
| | ____|_|______________
| |_____________| | |
| SIBLING | |
|_________________| ______V__________ _________________
OBJECT | _____________ | | _____________ |
| | Z | | | | OPD | |
| |_____________| | __\| |_____________| |
| NAME | | /| TYPE |
| _____________ | | |_________________|
| | ____|_|___| DESCRIPTION
| |_____________| |
| DESCRIPTION |
| _____________ | _________________
| | ____|_|______\| |
Figure 4-14 | |_____________| | /|_________________|
X, Y, and Z after | VALUE | OPD
L/CREATE |_________________|
OBJECT
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | F | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | LIST | |
| |_________|___| | | |_____________| |
| CHILD | | | TYPE |
|___________|_____| | _____________ |
OBJECT | | | | |
| | |___________|_| |
___________V_____ __\| CHILD | |
| _____________ | | /|_____________|___|
| | F | | | DESCRIPTION |
| |_____________| | | |
| NAME | | _____________V___
| _____________ | | | _____________ |
| | ____|_| | | | R | |
| |_____________| |___| | |_____________| |
| DESCRIPTION | | NAME |
| _____________ | | _____________ |
| | | | | | STRUCT | |
| |_________|___| | | |_____________| |
| VALUE | | | TYPE |
|___________|_____| | _____________ |
OBJECT | | | | |
| | |___________|_| |
___________V_____ | CHILD | |
| | |_____________|___|
| | DESCRIPTION |
|_________________| _____________V___
VALUE | _____________ |
| | A | |
| |_____________| |
| NAME | _________________
| _____________ | | _____________ |
| | STRING | | | | B | |
| |_____________| | | |_____________| |
| TYPE | | NAME |
| _____________ | | _____________ |
| | ____|_|_____\| | STRING | |
Figure 4-15 | |_____________| | /| |_____________| |
F immediately after | SIBLING | | TYPE |
creation |_________________| |_________________|
DESCRIPTION DESCRIPTION
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | OPF | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |_______|_____| |
| CHILD | | | VALUE | |
|___________|_____| |_________|_______|
OBJECT | OBJECT |
___________V_____ _________V______
| _____________ | | _____________ |
| | F | |/______|_|____ | |
| |_____________| |\ | |_____________| |
| NAME | | LIST |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |________|____| |
| VALUE | | | MEMBER | |
|___________|_____| |__________|______|
OBJECT | VALUE | OPD
| __________V______
___________V_____ | _____________ |
| | | | M | |
| LIS | | |_____________| |
|_________________| | NAME |
VALUE | _____________ |
| | | |
| |________|____| |
| CHILD | |
|__________|______|
OBJECT |
__________V______ _________________
| _____________ | | _____________ |
| | A | | | | B | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | ____|_|_____\| | | |
| |_____________| | /| |_____________| |
| SIBLING | | |
|_________________| |_________________|
OBJECT OBJECT
_________________ _________________
| _____________ | | _____________ |
| | M | | | | STRUC | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | |
| | VALUE | ____________V____
| | _____________ | | _____________ |
| | | | | | | STRING | |
| | |_________|___| | | |_____________| |
| | CHILD | | ___\| TYPE | _____________
| |___________|_____| | /| _____________ | | _________ |
| OBJECT | | | | ____|_|______\| | STRING | |
| | | | |_____________| | /| |_________| |
| ___________V_____ | | SIBLING | | TYPE |
| | _____________ | | |_________________| |_____________|
| | | A | | | DESCRIPTION DESCRIPTION A
| | |_____________| | | |
| | NAME | | _________________ |
| | _____________ | | | _____________ | |
| | | ____|_|__| | | B | | |
| | |_____________| | | |_____________| | |
| | DESCRIPTION | | NAME | |
| | _____________ | | _____________ | |
| | | | | | | ____|_|___________________|
| | |_____________| | | |_____________| |
| | VALUE | | DESCRIPTION |
| | _____________ | | _____________ |
| | | ____|_|______\| | | |
| | |_____________| | /| |_____________| |
| | SIBLING | | VALUE |
| |_________________| |_________________|
| OBJECT OBJECT
|___________________________
|
_____________________V____________________
| _____________ _____________ |
| | | | | |
| |_____________| |_____________| |
|__________________________________________| Figure 4-17
VALUE After L/OPEN/MEMBER
_________________ _________________
| _____________ | | _____________ |
| | M | | | | STRUC | |
| |_____________| | | |_____________| |
| NAME | | TYPE |
| _____________ | | _____________ |
| | ____|_|______\| | | |
| |_____________| | /| |__________|__| |
| DESCRIPTION | | CHILD | |
| _____________ | |____________|____|
_____|_|____ | | DESCRIPTION |
| | |_____________| | |
| | VALUE | ____________V____
| | _____________ | | _____________ |
| | | | | | | STRING | |
| | |_________|___| | | |_____________| |
| | CHILD | | ___\| TYPE | _____________
| |___________|_____| | /| _____________ | | _________ |
| OBJECT | | | | ____|_|______\| | STRING | |
| | | | |_____________| | /| |_________| |
| ___________V_____ | | SIBLING | | TYPE |
| | _____________ | | |_________________| |_____________|
| | | A | | | DESCRIPTION DESCRIPTION A
| | |_____________| | | |
| | NAME | | _________________ |
| | _____________ | | | _____________ | |
| | | ____|_|__| | | B | | |
| | |_____________| | | |_____________| | |
| | DESCRIPTION | | NAME | |
| | _____________ | | _____________ | |
| __|_|____ | | | | ____|_|___________________|
| | | |_____________| | | |_____________| |
| | | VALUE | | DESCRIPTION |
| | | _____________ | | _____________ |
| | | | ____|_|______\| | | |
| | | |_____________| | /| |_____________| |
| | | SIBLING | | VALUE |
| | |_________________| |_________________|
| | OBJECT OBJECT
| |___________
| |
| ________|_________________________________
| | ______V______ _____________ |
|____\| | "AB" | | | |
/| |_____________| |_____________| |
|__________________________________________| Figure 4-18
VALUE After first L/ASSIGN
_________________ _________________
| _____________ | | _____________ |
| | STAR | | | | OPF | |
| |_____________| | | |_____________| |
| NAME | | NAME |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |___________|_| |
| CHILD | | | VALUE | |
|___________|_____| |_____________|___|
OBJECT | OBJECT |
___________V_____ _____________V___
| _____________ | | _____________ |
| | F | |/______|_|____ | |
| |_____________| |\ | |_____________| |
| NAME | | LIST |
| _____________ | | _____________ |
| | | | | | | |
| |_________|___| | | |___________|_| |
| VALUE | | | MEMBER | |
|___________|_____| |_____________|___|
OBJECT | VALUE | OPD
| _____________V___
______________V_________ | _____________ |
| ______________________ | | | M | |
|| _________ _________ || | |_____________| |
||| "AB" || "CD" ||| | NAME |
|||_________||_________||| | _____________ |
||______________________|| | | | |
| / | | |___________|_| |
| / | |_____________|___|
|_______________/________| OBJECT |
VALUE / / _____________V___ _________________
/ / | _____________ | | _____________ |
/ / | | | | | | B | |
/ LIST | |_____________| | | |_____________| |
/ | NAME | | NAME |
/ | _____________ | | _____________ |
NEW MEMBER VALUE | | ____|_|_____\| | | |
| |_____________| | /| |_____________| |
|_________________| |_________________|
OBJECT OBJECT
_________________
| _____________ |
| | F | |
| |_____________| |
| NAME |
| _____________ |
| | ____|_|_________\
| |_____________| | /
| DESCRIPTION |
| _____________ |
| | | |
| |_________|___| |
| VALUE | |
|___________|_____|
OBJECT |
|
_______________V______________
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "AB" | | "CD" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "EF" | | "GH" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "AB" | | "IJ" | | |
| | |_________| |_________| | |
| |__________________________| |
| __________________________ |
| | _________ _________ | |
| | | | | | | |
| | | "CD" | | "LM" | | |
| | |_________| |_________| | |
| |__________________________| |
|______________________________|
VALUE
------------------------------------
IMP(0) | pkt(0) | pkt(1) | ... | pkt(m-1) |
------------------------------------
| | ------------------------------------
IMP(1) | | | pkt(0) | pkt(1) | ... | pkt(m-1) |
| | ------------------------------------
| | | :
| | | :
| | | ------------------------------------
IMP(h-1)| | | | pkt(0) | pkt(1) | ... | pkt(m-1) |
|<------>| |<- ------------------------------------
\ \
\ `---> propagation delay from IMPO to IMPl
`--> packet transmission delay
___8______8_______8_______8____
| I I I I
I LMR | link | LRN | MSN I
I______I_______I_______I______I_
____8_________8________8__________8_________8_____
I I I I I I
I LMS I Link I LRN I MSN I COUNT I
I________I________I_________I__________I________I_
____8___________3_2_______________3_2_____________8_______8____
I I I I I I
I CLS2 I my socket I your socket I LRN I MSN I
I________I_______________I__________________I________I_______I_
_____8___________3_2___________3_2_________
I I I I
I ECLS I my socket I your socketI
I_________I______________I______________I_
____8_________8_________8_________8____
I I I I I
I SFR I LINK I LRN I MSN I
I_________I_________I_________I________I_
____8_________8_________8_________8____
I I I I I
I SFS I LINK I LRN I MSN I
I_________I_________I_________I________I_
__________________
| PDP-11 |
| SPEECH FRONT END |________
| 50.=62(8) | __|_________
|__________________| | |
__________________ | IMP-50 |________\ NCC-TIP
| PDP-10 | |____________| /
| SYSTEM D |________| | |
| 114.=162(8) | | |
|__________________| | |________________________
__________________ | |
| PDP-10 | | |
| SYSTEM A |________ | |
| 197.=305(8) | | | |
|__________________| | | |
__________________ __|___|_____ |
| PDP-11 | | | |
| LPT |_____| IMP-5 |________\ CCA |
| 69.=105(8) | |____________| / |
|__________________| | | |
__________________ | | |
| PDP-11 | | | |
| PACKET RADIO |________| | |
| 133.=205(8) | | |
|__________________| | |
__________________ | ________________________|
| PDP-10 | | |
| SYSTEM B |________ | |
| 49.=61(8) | __|___|___|_ ____________
|__________________| | 49 |_____| 161 |
__________________ | BBN10X-TIP | VDH | ANALOG TIP | Local
| PDP-10 | |____________| |____________| Terminals
| SYSTEM C |________|
| 241.=361(8) |
|__________________|
0-no TCB
\____________________________________________________________/
OPEN | A CLOSE CLOSE A
---------- | | ---------- ---------- |
set up TCB | | remove TCB remove TCB |
| | |
| | collision retry, |
SYN arrives __V____|__ SEND, INTER |
------------- / S1=0 \ ---------------- |
send SYN, ACK | S2=0 F=0 | send SYN |
______________________| R=0 C=0 |_____________________ |
| | U=0/1 | | |
| | | SYN arrives | |
| error,timeout | 1-OPEN | ----------- | |
| ------------- \__________/ collision; | |
| clear TCB A A set timeout | |
| _____________________| |_____________________ | |
__V____|__ _|___V__|_
/ S1=1 \ / S1=1 \
| S2=0 F=0 | | S2=0 F=0 |
| R=1 C=0 | SYN, ACK arrives | R=0 C=0 |
| U=0/1 | ACK arrives ---------------- | U=0 |
| | ----------- send ACK | |
| 3-SYN rcvd |_________________ _________________| 2-SYN sent |
\__________/ | | \__________/
| __V_____V__
| / S1=1 \
| CLOSE | S2=1 F=0 |
| -------- | R=1 C=0 | FIN arrives
| send FIN | U=0 | -------------------
| | | tell user, send FIN
| ________________|4-established|______________________
| | CLOSE \___________/ |
| | ------- |
__V_____V_ send FIN _______V__
/ S1=1 \ / S1=1 \
| S2=0/1 F=1 | timeout or | S2=1 F=1 |
| R=1 C=1 | FIN, error, arrives CLOSE | R=1 C=0 |
| U=0/1 | ------------------- ---------- | U=0 |
| | remove TCB remove TCB | |
| 5-FIN wait |_____________________ _____________| 6-FIN rcvd |
\__________/ | | \__________/
| |
____________________________V_____V_______________________
/ \
0-no TCB
| _____________ _______________ |
| | | | | |
| | | | INPUT PACKET |<---->|
| | REASSEMBLER | | HANDLER | |
| |_____________| |_______________| |
| |_______________ | |
| | | |
| _________ | | |
| | | __V_________V____ | NETWORK
|<=====| SYSTEM | | | | or
| | CALLS |<========| TCB's |<========| some
USERS |=====>| or | | and | | NETWORK
| | USER |========>|ASSOCIATED QUEUES|========>| INTERFACE
|<---->|INTERFACE| |_________________| | PROGRAM
| |_________| A A |
| | | |
| ______________| | |
| _______|_____ _______|_______ |
| | | | | |
| | PACKETIZER | | OUTPUT PACKET | |
| | | | HANDLER |<---->|
| |_____________| |_______________| |
| |
FIGURE 2.2a: ________
Address Check / Begin \
\________/
|
_V_
.' '.
.' packet '.
.' foreign '.
___________________.' socket matches '.
| no '. a TCB local .'
| '. socket .'
| '. ? .'
| '.___.'
| | yes
| _V_
| .' '.
| .' packet '. ___
| .'local socket '. / \
| .' matches fully '.____\| YES |
| '. specified TCB .' / \___/
| '.fgn socket .'
| '. ? .'
_V_ '.___.'
.' '. | no
.' SYN, '. _V_
.'FIN,INT,DSN, '. .' '.
_____.'or text length>0 './_____ .' matches '.
| no '. or QUERY .' \ | .'partly spec. '.
| '. .' |___.' or unspec. TCB '.
| '. ? .' no '. foreign .'
| '.___.' '. socket .'
| | yes '. ? .'
| __________V_________ '.___.'
| | | | yes
| | Create error 7 | _V_
| | packet. Signal OPH | .' '.
| |____________________| .' packet '.
| | ______.' has SYN set '.
| ____V____ | no '. .'
| | | | '. ? .'
|_________\| discard |/________| '.___.'
/|_________|\ |
| _V_
_V_ / \
/ \ | YES |
| NO | \___/
\___/
FIGURE 2.2b-1: _______
Input Packet Handler / Begin \
\_______/
|
________________________________________\|/_________________________
| A /|\ |
| | | |
| | _V_ |
| | .' '. _______ |
| | .' input '. | go to | |
| | .' packet '.____\| sleep | |
| | '.available.' no /|_______| |
| | '.__?__.' |
| | | yes |
| | _V_ |
| | .' '. |
| .->SPECIAL FUNCT. Fig 4.7 | .'address'. |
| | .->ERR Fig 4.5,4.6 |___.' check OK '. |
| | | .->SYN Fig 4.1,4.2 no '. ? .' |
| | | | .->INT Fig 4.3 '._____.' |
| | | | | .->FIN Fig 4.4 | yes ________|_
| | | | | | _V_ | discard |
| _|_|_|_|_|___________ .' '. |(or queue)|
| | | .' error '. |__________|
|<-| Control Processing |/_________.'or control '. A
|____________________|\ yes '. ? .' |
| '._____.' |
| (INT with data) | no |
| | |
V _V_ |
to "X" .' '. . |
in Fig 2.2b-2 .'(estab)'. .' '. |
_____.' R=S1=S2=1 '.----->.'seq.#'.--->|
| yes '. ? .' no '.OK .' no |
| '._____.' '.' |
| | yes |
| _______________ | |
| | Set S2=1, U=0 | V |
| | Notify user | .'. |
|<--| with event 2 | .'ACK'. |
| | if U was 1 |<-----'. OK .'--->'
| |_______________| yes '. .' no
| '
V
to "Y"
in Fig 2.2b-2
"Y"
|
.'. _V_
.'txt'. .' '. ______________________________
.'lgth>0 '. .'within '. |Use ACK to advance send window|
,<----'. or DSN .'<---'. window .'--->|Release ACK'ed packets from |
| no '. ? .' no '. ? .' yes |retransmit or send queues. If |
| '._.' '._.' |any packet had EB bit set |
| | yes |remove buffer from Packetized |
| ________V____________________ |buffer queue and inform user |
| |Create ACK packet. Put on | |(success). Signal Packetizer. |
|<-|Send packet queue. Signal OPH| |______________________________|
| |_____________________________| |
| |
| _____________________________________________|
| |
| |
| | "X"
| | |
| _V_ _V_ _____________________
| .' '. .'TCB'. |Put packet on |
| .' text '. yes .'Receive'. yes |Receive packet queue |
| .' length>0 '.-------->.' buffer '.------>|in the right order. |
| '. or DSN .' A '.available.' |Signal Reassembler. |
| '. ? .' | '. ? .' |_____________________|
| '._.' | '._.' |
| | no | | no |
| | | _V_ |
|________\| | .' '. |
/| | .' seq # '. ________ |
| | .' of packet '. yes |Discard | |
| | '. highest so .'---->|packet |----->|
| | '. far .' |________| |
| | '. ? .' |
| | '._.' |
| | | no |
| | _______V______________ |
| | |Discard packet with | |
| |_____|highest seq. no from | |
| |Receive packet queue. | |
| |______________________| |
| |
|_____________________________________________________|
|
V
to "Begin" in Fig 2.2b-1
_______
/ Begin \
\_______/
|
|
|<----------------------------------------------.
| _____ | yes
______V_____ .' '. _|_
|Get ready | .' Receive '. yes .'any'.
|for next TCB|--------->.'Packet Queue '.-------->.' more '.
|____________| A '. empty ? .' A '.work?.'
| '._______.' | '._.'
| | no | | no
"R"------>---------' __V__ | ____V____
.' is '. | | Go to |
.' packet '. | | Sleep |
.--<----------------------'.DSN with no.' | |_________|
| yes '. data? .' |
| '.___.' |
| | no |
| __V__ |
| .' '. |
| .' Receive '. yes |
| .'Buffer Queue '.--->|
| '. empty ? .' |
| ________________ '._______.' |
| |Copy from packet| | no |<-------------"S"
| |to buffer until | __V__ |
| |one is exhausted| .'First'. |
| |Update receive | yes .' packet '. no |
| |window. |<----.'matches Recv '.--->'
| |________________| '.left window.'
| | '. edge ?.'
| __V__ '.___.'
| .'Send '.
| .' Packet '. yes _____________________________
| .' Queue empty '.---->|Create ACK packet containing |
| '. ? .' |new window. Signal OPH. |
| '._______.' |_____________________________|
| no | |
| | |
| '--------------------------->|
| |
V V
to "T" to "U"
in Fig 2.3-2 in Fig 2.3-2
"T" "U"
| |
| | _____________
___V____ ___ __V__ |Mark progress|
|process | yes .' '. yes .'whole'. no |in packet. |
| DSN |<-----.' DSN '.<-----.' packet '.--->|Return buffer|--->.
|________| '. set?.' '.copied?.' |to user. | |
| '._.' '.___.' |_____________| |
| | no |
'--------------->| |
| |
__V__ __________________________ |
.' EOL '. yes |Return buffer to user. | |
'. set? .'--------->|Return packet to free |--->|
'.___.' |storage. Signal Packetizer| |
no | |__________________________| |
| A |
__V__ | |
.' full'. | |
'. buffer.'--------------' |
'.___.' yes |
| no |
| |
___________________V__________________ |
|Mark progress in buffer. Return packet| |
|to free storage. Signal Packetizer. | ,--------'
|______________________________________| |
| |
| |
V V
to "R" in Fig 2.3-1 to "S" in Fig 2.3-1
_______ ________________________
/ Begin \____________\| Get ready for next TCB |/___________________
\_______/ /|________________________|\ |
| |
__V__ _____ |
.'Send '. .' any '. |
no .' Buffer '. yes .' more '. yes |
.-------------'. Queue .'---->'. work .'-----'
| '.empty? .' A '. ? .'
____________V____________ '.___.' | '.___.'
|Pick packet size depend- | | | no
,-->|ing on send buffer, TCB | | ______V______
| |buffer space, window, etc| | | go to sleep |
| |_________________________| | |_____________|
| | |
| __V__ |
| .'Send '. |
| .' window '. no |
| '.has room ? .'--------------------->|
| '._______.' |
| | yes |
| __V__ |
| .' TCB '. |
| .' buffer '. no |
| .'space avail- '.---------------------'
| '. able ? .' A
| '._______.' |
| | yes |
| _____________V____________ _________|_______ ____________
| |Copy from Send buffer to | |Move buffer from | |Set EOL bit |
| |packet until packet full. | |Send queue to |<--|in packet |
| |Put packet on Send packet | |packetized queue | |header |
| |queue. Signal OPH. | |_________________| |____________|
| |__________________________| A A
| | | no |
| __V__ __|__ |
| .'whole'. .' EOL '. |
| .' Send '. yes .' set in '. yes |
| '. buffer .'----------->'. Send .'-----------'
| '.copied?.' '.buffer?.'
| '.___.' '.___.'
| | no
| _____________V__________
| |Note in TCB where in |
--|Send buffer we stopped. |
|________________________|
FIGURE 2.5a:
Output Packet Handler
_______
/ Begin \
\_______/
|
|<--------------------------.
____________V___________ |
| Get ready for next TCB | |
|________________________| |
| |
,------------------------------------>| |
| __V__ _____ |
| _____ .'Send '. .' any '. |
| yes .' ACK '. no .' Buffer '. yes .' more '. yes |
| .-----'.bit set.'<------'. Queue .'---->'. work .'-----'
| | '.___.' '.empty? .' A '. ? .'
| | no |________ '.___.' | '.___.'
| | |__________ | | no
| ____V__________________ | | |
| |Put latest receive left| ________v______ | ______V______
| |window edge in ACK. |->|Transmit packet| | | go to sleep |
| |_______________________| |_______________| | |_____________|
| | |
| ________________ __V__ |
| |Return packet to| .'pckt '. |_________________
| |buffer pool as | no .'seq # to '. |
| |it has been |<------.'rgt of Send '. |
| |ACKed | '.left window.' |
| |________________| '. edge .' |
| | '.___.' |
| | | yes |
| | _______________V________________ |
| | |Move packet to retransmit queue;| |
| | |set new retrans. time for it. | |
| | |________________________________| |
| | | |
| '---------------------->| |
| __V__ |
| no .'Time '. yes |
-------------------------------.'to switch'.---------------------'
'.TCB's? .'
'.___.'
_______
/ Begin \
\_______/
|
|<----------------------------------.
____________V___________ |
| Get ready for next TCB | |
|________________________| |
| |
.-------------------------------->| |
| __V__ |
| .' Any '. _____ |
| .'packet's '. .' any '. |
| .'retrans. time'. no .' more '. yes |
| '. has occurred .'----->'. work .'-----'
| '. for this .' '. ? .'
| '. TCB ? .' '.___.'
| '.___.' |
| | yes | no
| | ______V______
| ________V________ | go to sleep |
| |Move packet to | |_____________|
'------------------------|Send Packet |
|queue. Signal OPH|
|_________________|
FIGURE 3.1:
OPEN
_______
/ Begin \
\_______/
|
__V__
.'User '. _______
.'permitted'. no | |
.' access to '.---->|error 1|------------.
'.this local .' |_______| |
'.socket?.' |
'.___.' |
| yes |
__V__ |
.' fgn '. |
yes .' socket '. no |
.-----'. specified .'----. |
| '. ? .' | |
__V__ '.___.' __V__ _______ |
_______ .'conn-'. .'space'. no | | |
| | yes .' ection '. '.for TCB.'---->|error 4|-->|
,-|error 6|<----'. already .' '.___.' |_______| |
| |_______| '.exists?.' | yes |
| '.___.' | |
| | no ____V__________ |
| _______ __V__ |Create TCB. Set| |
| | | no .'space'. |S1=S2=R=F=C=1 | |
|<-|error 4|<-----'.for TCB.' |Set U=1 | |
| |_______| '.___.' |_______________| |
| | yes | |
| | | |
| _________V__________ | |
| |Create TCB. Set U=0 | | |
| |Set S1=S2=R=F=C=1 | | |
| |____________________| | |
| | | |
| '-------------.-------------' |
| | |
| _____________________V__________________ |
| |Return local connection name and Success| |
| |________________________________________| |
| | |
----------------------------------->|<--------------------------------'
____V___
/ Return \
\________/
FIGURE 3.2:
SEND
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
__V__ |
.'conn-'. _________ |
.' ection '. no | | |
.' open '.----------->| error 3 |---------->|
'. ? .' |_________| |
'._______.' |
| yes |
__V__ |
.' fgn '. _________ |
.' socket '. no | | |
'. specified .'------------>| error 5 |---------->|
'.(U=0)? .' |_________| |
'.___.' |
| yes |
__V__ |
.'conn-'. _________ |
.' ection '. yes | | |
'. closing ? .'------------>| error 12|---------->|
'.(F,C=1).' |_________| |
'.___.' |
| no |
____________________V________________________________ |
|Put buffer on Send Buffer queue and signal Packetizer| |
|_____________________________________________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
| |
| |
____________________V_________________________ |
|Return any pending Send buffers with code 10. | |
|Create INT packet on outgoing packet queue. | |
|Signal Output Packet Handler. | |
|______________________________________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.4:
RECEIVE
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
_V_ |
.' '. |
.' '. |
.'connection '. |
.' state '. |
:___________________: _________ |
| | | | | |
1-4 | 5,6 | 0 '-------------------->| error 3 |-->|
| '---------------------. |_________| |
__________V__________ | |
|Put buffer on Receive| | _________ |
|Buffer queue. Signal | | | | |
|Reassembler | '----->| error 12|-->|
|_____________________| |_________| |
| |
|<------------------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.5:
CLOSE
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
_V_ |
.' '. |
.' '. |
.'connection '. |
.' state '. |
:___________________: _________ |
5| |3,4 |1,2,6 |0 | | |
| | | '------------------>| error 3 |-->|
,------------' | '-------------------. |_________| |
| ______________V______________________ | |
| |Return all buffers to user with error| | ___________ |
| |12; clear all packet queues, create | | |Remove TCB | |
| |FIN packet, signal Output Packet | '--->|Return |--->|
| |Handler, set C=F=1 | |Success | |
| |_____________________________________| |___________| |
| | |
--------------------->|<----------------------------------------'
____V___
/ Return \
\________/
FIGURE 3.6:
STATUS
_______
/ Begin \
\_______/
|
__V__
.'conn-'.
.' ection '. _________
.' legal for '. no | |
'. this process .'---------->| error 1 |-----------.
'. ? .' |_________| |
'._______.' |
| yes |
__V__ __________ |
.'conn-'. |Return | |
.' ection '. no |state=0 or| |
'. open ? .'------------>|error 3 |--------->|
'._______.' |__________| |
| yes |
___________V___________ |
|Fill in reply from TCB.| |
|Return Success to user.| |
|_______________________| |
| |
|<-----------------------------------------'
____V___
/ Return \
\________/
FIGURE 4.1:
SYN (no ACK)
_______
/ Begin \
\_______/
|
_V_
.' '.
.' '.
.' S1, S2, R '.
.' ? '.
:___________________: 1,1,1 _________
__________ | | | | (states 4-6) | |
|Treat as a| 1,0,1 | | | '------------->| error 6 |-->.
|duplicate.|<-----------' | | |_________| |
|Retransmit| | | 1.0,0 |
|SYN, ACK | 0,0,0 | | (Syn sent) ________________ |
|__________| (listening) | '------------>|Collision: Clear| |
| | |S1, set timeout,| |
| _____________________V________________ |remove SYN from |-->|
| |Set R=S1=1. If U=1 set foreign socket | |retransmit queue| |
| |in TCB to match packet local socket. | |________________| |
| |Send SYN, ACK. Signal OPH. Fill in TCB| |
| |with send window, receive sequence #. | |
| |______________________________________| |
| | |
| | |
'----------------------->|<---------------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
__V__
.' '.
.' State 2 '. no
'.S1=1;S2=R=0.'----------------.
'. ? .' |
'.___.' |
| yes |
__V__ _______V______
.' ACK '. no | |
.' correct '.-------->| send error 6 |
'. ? .' |______________|
'.___.' |
| yes |
_________V_________ |
|Set S2=R=1. Process| |
|ACK. Send ACK. | |
|___________________| |
| |
|<----------------------'
___V__
/ Done \
\______/
FIGURE 4.3:
INT (from net)
_______ ____________
/ Begin \____\|Process ACK |
\_______/ /|(may set S2)|------.
|____________| |
|
__V__
____________ .' in '.
| Discard | no .' state 4 '.
.<-------| (or queue) |<-------'. S1=S2=R=1 .'
| |____________| '. F=0 ? .'
| '.___.'
| | yes
| __V__
| ____________ .' '.
| | ACK and | no .' within '.
|<-------| discard |<-------'. window .'
| |____________| '. ? .'
| '.___.'
| | yes
| ____________________________V_______________
| |Move Receive Left window edge to sequence |
| |number of INT. Return event 10 with any |
| |pending Receive buffers. Ruturn event 11 to |
| |user. Send ACK for INT. |
| |____________________________________________|
| |
| __V__
| see yes .'data '.
| Figure<----------.' in this '.
| 2.2 '.packet?.'
| '.___.'
| | no
'------------------------------------>|
___V__
/ Done \
\______/
FIGURE 4.4:
FIN
_______ ____________
/ Begin \____\|Process ACK |
\_______/ /|(may set S2)|------.
|____________| |
|
__V__
.' '.
no .'S1=S2=R=1'.
.--------------'. (estab- .'
| '.lished).'
| '.___.'
| | yes
| __V__
______V_____ .' '.
| | no .' within '.
.-----------------| discard |<-------'. window .'
| |____________| '. ? .'
| '.___.'
| | yes
| __V__
| (state 4) 0 .'F bit'. 1 (state 5)
| .------------'. value .'------------.
| | '.___.' |
| _________________________V________ |
| |Return all user buffers (event 12)| _____________________V__
| |Clear all packet queues. Send FIN | |Return success to User's|
| |packet. Set F=1. Inform user | |CLOSE. Remove TCB. |
| |"connection closing" (event 12) | |________________________|
| |__________________________________| |
| | |
'----------------->|<-----------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
|
__V__
.' '.
.'refers to'.
.'current pckt?'. _________
.'(ACK matches seq '. no | |
'. # of packet on .'----------------->| discard |-----------.
'.retrans or send.' |_________| |
'. queues?) .' |
'._______.' |
| yes |
| |
_V_ |
.' '. 1 (state 3) |
.' value '.--------------------------------. |
'. of R.' bad SYN,ACK | |
'._.' | |
| | |
| 0 (state 2) | |
| bad SYN | |
__________________V__________________ _______V______ |
|Other side is established. Send RESET| |Clear S1, R | |
|(put error packet's seq. # in ACK | |Remove SYN,ACK| |
|field. Return all user buffers with | |from retrans | |
|code 14. Inform user with event 14 | |queue. | |
|_____________________________________| |______________| |
| | |
| V |
|<--------------------------------------------------'
___V__
/ Done \
\______/
_______
/ Begin \
\_______/
|
__V__
.' '.
.'refers to'. _________
.' current '. no | |
'. packet (check .'---------------->| discard |-----------.
'. ACK)? .' A |_________| |
'._______.' | |
| yes | |
_V_ | |
.' '. | |
.' '. | |
.'connection '. | |
.' state '. | |
:___________________: | |
4| 5| 3| 2| 6| | |
.-------' | | | '------' |
| | | '-----------------------------. |
| | '-------------. | |
| | | | |
___V___ ____V_______ ______V_______ ________V_________ |
|Pass to| |Remove TCB. | |Clear S1, R. | |Discard. SYN will | |
|user | |Return | |Remove SYN,ACK| |be retrans to | |
|_______| |success to | |from transmit | |avoid receiver | |
| |user's CLOSE| |queue (go to | |having to queue it| |
| |____________| |state 1). | |__________________| |
| | |______________| | |
| V | V |
'------------------------------>|<---------------------------------'
___V__
/ Done \
\______/
FIGURE 4.7:
RESET
_______
/ Begin \
\_______/
|
__V__
no .'Reset'. yes
.------------'. All ? .'------------------.
| '.___.' |
| _________V_________
| |Clear all TCB's for|
| |foreign TCP. Inform|
| |users with event 14|
| |___________________|
__V__ |
.' Is '. _________ |
.' RESET '. no | | |
.'believable ? '.------->| discard |------------->|
'.(check ACK .' |_________| |
'.field) .' |
'.___.' |
| yes |
________________V________________ |
|Clear all queues for this TCB. | |
|Return event 14 for user buffers.| |
|Inform User with event 14. | |
|_________________________________| |
| |
|<----------------------------------------'
___V__
/ Done \
\______/
Limitations of Procedure Calling Across Machines___________ __ _________ _______ ______ ________
/ ------\ /-------\ /-----\
! !BEGIN(new index) ! ! ! !
! !->--------------->-!Index ! ! !
!Index !LISTEN(new index) !Open ! ! !
!Closed ! !Pending! !Index!
! ! REPLY(N)! !REPLY(A) !Open !
! !-<---------------<-! !->------->-! !
! ! \-------/ ! !
! ! ! !
! ! /-------\ END(Path=0)! !
! ! ! !-<-------------<-! !
! ! REPLY(A)!Index ! ! !
! !-<---------<-!Close !REPLY(N) ! !
! ! !Pending!->------------->-! !
\-------/ \-------/ \-----/
/------\BEGIN /----------\
! !->-------->-! !
! !LISTEN !Connection!
!Path ! !Pending !REPLY(A) /-------\
!Closed! REPLY(N)! !->------------>-! !
! !-<--------<-! ! ! !
! ! \----------/ !Path !
! ! !Conn- !
! ! /-----\ RESPONSE(CODE>0)! ecting!
! ! ! !-<-----------------<-! !
! ! !Path ! ! !
! ! REPLY(A)!Abort! END(PATH>0)! !
! !-<--------<-!Pend-!-<-----------------<-! !
! ! ! ing ! ! !
! ! ! !REPLY(N) ! !
\------/ ! !->----------------->-! !
\-----/ ! !
! !
/-------\ ! !
! ! RESPONSE(CODE=0)! !
/----\ !Path !-<--------------<-! !
! ! !Open ! ! !
!Path! !Pending!REPLY(N) ! !
!Open! REPLY(A)! !->-------------->-! !
! !-<--------<-! ! \-------/
\----/ \-------/
/----\MESSAGE /-------\ /-------\
! !->---------------->-! !REPLY(A+NR) ! !
!Path!INTERRUPT !Command!->--------->-!Message!
!Open! !Blocked!REPLY(N+NR) !Blocked!
! ! ! ! ! !
! ! REPLY(A+R)! ! INTERRUPT! !
! !-<----------------<-! !-<---------<-! !
! ! REPLY(N+R)\-------/ ! !
! ! REPLY(R)! !
! !-<----------------------<---------------<-! !
! ! ! !
! !END(PATH>0) /-------\ END(PATH>0)! !
! !->---------------->-! !-<---------<-! !
! ! ! ! ! !
! ! REPLY(N+R)!Path !REPLY(N) ! !
! !-<----------------<-!Close !->--------->-! !
\----/ !Pending! \-------/
! !
/------\ REPLY(A)! !
!Path !-<--------------<-! !
!Closed! ! !
! ! \-------/
\------/
An equivalent tree representation follows, for those
who prefer it.
start with high order bit
|
|
|
0-----0-----0-----0-----0-----0-----0-----0-----X
| | | | | | | | PADDING
0| 0| 0| 0| 0| 0| 0| 0|
| | | | | | | |
X | X | X | X X
CHAR7 | NON-ATOM | BITS | BOOL EMPTY
(7) | (5) | (3) | (1)
| 0| | |
SINTEGER | XTRA
(6) | (2)
LINTEGER
(3)
User User
\ /
\ /
\ /
--+----------------------------------------+-- Service
! \ / ! Interface
! +--------+ +--------+ !
! ! Module ! <--Protocol--> ! Module ! !
! +--------+ +--------+ !
! \ / !
! +-----------------------+ !
! ! Communication Service ! !
! +-----------------------+ !
! !
+----------------------------------------+
User User
\ /
\ /
\ /
+---------------------------------------------------------+
! \ / !
! +-----+ +-----+ +-----+ !
! ! MPM ! <--Protocol--> ! MPM ! <--Protocol--> ! MPM ! !
! +-----+ +-----+ +-----+ !
! ! / \ ! !
! +-----------------------+ +-----------------------+ !
! !Communication Service A! !Communication Service B! !
! +-----------------------+ +-----------------------+ !
! !
+---------------------------------------------------------+
+-----+ DATA +-----+
other-->! MPM !-->STRUCTURES-->! UIP !-->USER
MPMs +-----+ +-----+ +-----+
! !
! +-----+
+--! !
! +-----+
+--! !
! !
+-----+
+------------------------------------------------+
! !
! processing DATA DATA !
! routines ---> ENCODER ---> COMPRESSOR ---> !
! !
+------------------------------------------------+
Send MPM
+------------------------------------------------+
! !
! DATA DATA processing !
! ---> DECOMPRESSOR ---> DECODER ---> routines !
! !
+------------------------------------------------+
Receive MPM
+------+ +-----+ +-------+ +-----+ +-----+
!Telnet! ! FTP ! !Message! !Voice! ... ! ! Application Level
+------+ +-----+ +-------+ +-----+ +-----+
\ ! / ! !
+-----+ +-----+ +-----+
! TCP ! ! RTP ! ... ! ! Host Level
+-----+ +-----+ +-----+
! ! !
+-------------------------------+
! Internet Protocol ! Gateway Level
+-------------------------------+
!
+---------------------------+
! Local Network Protocol ! Network Level
+---------------------------+
!
+------+------+------+------+------
1 Padding ! 0 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+
4 Integer ! 4 ! Data !
+------+------+------+------+------+
+------+------+------+------+------
5 Bit String ! 5 ! bit count ! Data ...
+------+------+------+------+------
+------+------+------+------+------
6 Text String ! 6 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+------+-----
7 List ! 7 ! octet count ! item count ! Data
+------+------+------+------+------+------+-----
+------+------+------+------+------
8 Proplist ! 8 ! octet count ! Data ...
+------+------+------+------+------
+------+------+------+------+------+
! 8 ! octet ! pair !
! ! count ! count!
+------+------+------+------+------+
+------+------+------+---------+---------+
! name ! value ! name ! value !
repeated ! count! count ! ...! ...!
+------+------+------+---------+---------+
+-----------------------------------------------------------------+
! 1 2 !
! sending --> originating --> relay --> destination --> receiving !
! user MPM MPM MPM user !
! !
! 4 3 !
! originating <-- relay <-- destination !
! MPM MPM MPM !
+-----------------------------------------------------------------+
+------+------+------+------+-------
9 Encrypt ! 9 ! octet count ! Data ...
+------+------+------+------+--------
+-+-------+--------+--------+----
!0! n ! n data octets ...
+-+-------+--------+--------+----
User User
\ /
UIP UIP
\ /
--+----------------------------------------+-- Service
| \ / | Interface
| +--------+ +--------+ |
| | Module | <--Protocol--> | Module | |
| +--------+ +--------+ |
| \ / |
| +-----------------------+ |
| | Communication Service | |
| +-----------------------+ |
| |
+----------------------------------------+
User User
\ /
UIP UIP
\ /
+---------------------------------------------------------+
| \ / |
| +-----+ +-----+ +-----+ |
| | MPM | <--Protocol--> | MPM | <--Protocol--> | MPM | |
| +-----+ +-----+ +-----+ |
| | / \ | |
| +-----------------------+ +-----------------------+ |
| |Communication Service A| |Communication Service B| |
| +-----------------------+ +-----------------------+ |
| |
+---------------------------------------------------------+
+-----+ DATA +-----+
other-->| MPM |-->STRUCTURES-->| UIP |-->USER
MPMs +-----+ +-----+ +-----+
| |
| +-----+
+--| |
| +-----+
+--| |
| |
+-----+
+------+ +-----+ +-------+ +-----+ +-----+
|Telnet| | FTP | |Message| |Voice| ... | | Application Level
+------+ +-----+ +-------+ +-----+ +-----+
\ | / | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
|
+------+ +-----+ +-------+
|Telnet| | FTP |---|Message| Application Level
+------+ +-----+ +-------+
\ /
+-----+ +-----+
|Voice|---| NCP | Host Level
+-----+ +-----+
|
|
| Gateway Level
|
|
+----------------+
| ARPA NET | Network Level
+----------------+
+------+------+------+------+------
1 Padding | 1 | octet count | Data ...
+------+------+------+------+------
+------+------+------+------+------+
4 Integer | 4 | Data |
+------+------+------+------+------+
Extended +------+------+------+------+------
5 Precision | 5 | octet count | Data ...
Integer +------+------+------+------+------
+------+------+------+------+------
6 Bit String | 6 | bit count | Data ...
+------+------+------+------+------
+------+------+------
7 Name String | 7 | count| Data ...
+------+------+------
+------+------+------+------+------
8 Text String | 8 | octet count | Data ...
+------+------+------+------+------
+------+------+------+------+-----
9 List | 9 | octet count | Data ...
+------+------+------+------+-----
+------+------+------+------+------
10 Proplist | 10 | octet count | Data ...
+------+------+------+------+------
+------+------+------+------+------+------+
| 9 | octet count | item count |
+------+------+------+------+------+------+
+------+------/---+
repeated | element |
+------+------/---+
+-------+
|ENDLIST|
+-------+
+------+------+------+------+------+
| 10 | octet count | pair |
+------+------+------+------+------+
+------+------/---+------+------/---+
repeated | name element | value element |
+------+------/---+------+------/---+
+-------+
|ENDLIST|
+-------+
+------+------+------+
12 Share Tag | 12 | share-index |
+------+------+------+
+------+------+------+
13 Share Reference | 13 | share-index |
+------+------+------+
+------+------+------+------+------+------+------+------+
|11 - 9|01 - 9| <a> | 12 | 0 | 1 | <b> | 11 |
+------+------+------+------+------+------+------+------+
+------+------+------+------+------+------+------+
|10 - 9| <c> | 13 | 0 | 1 | 11 | 11 |
+------+------+------+------+------+------+------+
+------+------+------+------+
14 Encrypt | 14 | octet count |
+------+------+------+------+
+------+------+------+-------
|alg id| key id | Data ...
+------+------+------+--------
+-----------------------------------------------------------------+
| A B |
| sending --> originating --> relay --> destination --> receiving |
| user MPM MPM MPM user |
| |
| D C |
| originating <-- relay <-- destination |
| MPM MPM MPM |
+-----------------------------------------------------------------+
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | |
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | |
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol |
+-------------------------------+
|
+---------------------------+
| Local Network Protocol |
+---------------------------+
|
0 1 2 3 4 5 6 7
+-----+-----+-----+-----+-----+-----+-----+-----+
| | | | | |
| PRECEDENCE | STRM|RELIABILITY| S/R |SPEED|
| | | | | |
+-----+-----+-----+-----+-----+-----+-----+-----+
+--------+--------+--------+---------//--------+
|00000011| length | source route |
+--------+--------+--------+---------//--------+
Type=3
+--------+--------+--------+---------//--------+
|00000111| length | return route |
+--------+--------+--------+---------//--------+
Type=7
+--------+--------+--------+--------+--------+--------+
|01000100|00000100| time in milliseconds |
+--------+--------+--------+--------+--------+--------+
Type=68 Length=6
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | | Application Level
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
|
+--------+--------+---------+--------+
|01000101|00000100| buffer size |
+--------+--------+---------+--------+
Kind=105 Length=4
RCV.NXT RCV.NXT+RCV.WND
| |
---------XXX|XXX------XXXXXXXXXX---------XXX|XX---------
| | | | |
| | |
Segment 1 Segment 2 Segment 3
| Buffer 1 | Buffer 2
| |
----+-------------------------------+-----------------
XXXXXXXXXXXXXXXXXXXXX+++++++++++
| | |
|<-----SEG.LEN------>| |
| | |
| | |
SEG.SEQ A B
-------------
|/---------\|
|| User || --------
||Interface|<--->| User |
|\----:----/| --------
---------- | V |
|/------\| FTP Commands |/---------\|
||Server|<---------------->| User ||
|| PI || FTP Replies || PI ||
|\--:---/| |\----:----/|
| V | | V |
-------- |/------\| Data |/---------\| --------
| File |<--->|Server|<---------------->| User |<--->| File |
|System| || DTP || Connection || DTP || |System|
-------- |\------/| |\---------/| --------
---------- -------------
TELNET ------------ TELNET
---------->| User-FTP |<-----------
| | User-PI | |
| | "C" | |
V ------------ V
-------------- --------------
| Server-FTP | Data Connection | Server-FTP |
| "A" |<---------------------->| "B" |
-------------- Port (A) Port (B) --------------
+----------------+----------------+----------------+
| Descriptor | Byte Count |
| 8 bits | 16 bits |
+----------------+----------------+----------------+
+--------+--------+--------+
|Descrptr| Byte count |
|code= 16| = 6 |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
3 +---+
----------->| E |
| +---+
|
+---+ cmd +---+ 2 +---+
| B |---------->| W |---------->| S |
+---+ --->+---+ +---+
| | |
| | | 4,5 +---+
| 1 | ----------->| F |
----- +---+
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
ftp (host) multics<CR> Connect to Host S, port L,
establishing TELNET connections
<---- 220 Service ready <CRLF>
username Doe <CR> USER Doe<CRLF>---->
<---- 331 User name ok,
need password<CRLF>
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 User logged in.<CRLF>
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for.pathname) test.pl1<CR> RETR test.pl1<CRLF> ---->
<---- 150 File status okay;
about to open data connection
Server makes data connection
to port U
<CRLF>
<---- 226 Closing data connection,
file transfer successful<CRLF>
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 450 Access denied<CRLF>
terminate QUIT <CRLF> ---->
Server closes all
connections.
0 1 2 3 length
+--------+--------+--------+--------+---//---+--------+--------+
| length | command| data |
+--------+--------+--------+--------+---//---+--------+--------+
------------ ------------
| | | | --------
| | MTP | |<-->| User |
| Receiver-|Commands/Replies| Sender- | --------
-------- | MTP |<-------------->| MTP | --------
| Mail |<-->| | Mail | |<-->| Mail |
|System| | | | | |System|
-------- ------------ ------------ --------
Old New
-+-+-+-+-+-----+---+--+---+--+-
...|M|A|I|L| ... |IAC|IP|IAC|DM|...
-+-+-+-+-+-----+---+--+---+--+-
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
AU1
|
AU0 | AU2
| | |
_______________
| |
| VT2 |
| |
| |
_______________
| _______________
| | |----AU0
|_______| VT0 |
|_______| |
| | |----AU1
| _______________
|
________________
| |
| |
| VT1 |
| |
________________
| | |
AU0 | AU2
|
AU1
___ ___ ___ ___
|VT1||VT2| |VT1||VT2|
____ _____ _____ ____
| | | |
__|_____|_________________|_____|__
| | | | | | | |
| REMOTE | -CONTROLLER-| REMOTE |
| KEYS | | DISPLAYS |
| | | |
| VIRTUAL | | DATA |
| KEYS | | STORE |
| |<----------->| |
| LOCAL | | LOCAL |
| KEYS | | DISPLAYS |
| | | |
__|_____|__________________|_____|__
| | | |
____ ____ _____ ____
|AU0||AU1| |AU0||AU1|
____ ____ _____ ____
| | |
| VIRTUAL TERMINAL | ADAPTATION UNIT |
|<------------------------------->|<--------------------------------->|
| DOMAIN | DOMAIN |
| | |
+ - - - - - - - - - + + - - - - - - - - - + - - - - - - - - -
| +---> x(m) | | | / /|
| | | | x(i) | / / |
| v y(m) | | +---------------> | - - - - - - - - - |
| | | | | | | +------------+ | |
| +--------------+ | | | | | | | VIEWPORT 1 | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | A<---------|--|-----|-|->A | | |
| | | | | | / \ | | | | | | |
| | <--------|--|---|-|-> \ | | | | | | |
| | / | | | | \ | | | | <---|-|--|+
| | A | | | | \ | | | +------------+ | ||
| | | | | | \ | | | | ||
| | WINDOW | | | | \ | | | +------------+ | ||
| | | | | | \ | | | | VIEWPORT 2 | | ||
| | | | | |-----------\--+ | | | | | ||
| | | | | | \ | | | | | ||
| +--------------+ | | v y(i) \ | | +------------+ | ||
| | | \ | | | / |
| | | \ | | | |
| | | \| - - - - - - - - |
| / | | / | | | |
+ - -/- - - - - - - + + - - -/- - - - - - +\ | | |
/ / \ - - - - - - - - |
/ / \ | KEYBOARD | |
MASTER WORKSPACE INSTANCE WORKSPACE \ + - - - - - - - + |
<-/ [] [] [] /| |
/ [] [] [] / | |
+ - - - - - - - - + |
|
PHYSICAL DEVICE WORKSPACE --+
+-----+ +-----+ +------+ +------+
| MTP | | MTP | | USER | |OTHER |
| TCP | | NCP | | MAIL | |MAIL |
| RCV | | RCV | | PGM | |SOURCE|
+-----+ +-----+ +------+ +------+
| | | |
| | | |
| | | |
v v v v
+----+ +----+ +----+ +----+
| | | | | | | |
Pending +----+ | +----+ | +----+ | +----+ |
Files | |-+ | |-+ | |-+ | |-+
| | | | | | | |
+----+ +----+ +----+ +----+
\ | | /
\ | | /
\ | | /
v v v v
+------------------+ TABLES
| | +----+
| DISPATCHER |<----->| |---+
| | | | |
+------------------+ +----+ |
/ / \ \ +----+
/ / \ \
/ / \ \
v v v v
+-----+ +-----+ +-------+ +-----+
| MTP | | MTP | | LOCAL | |OTHER|
| TCP | | NCP | |MAILBOX| |MAIL |
| SND | | SND | | FILES | |SINK |
+-----+ +-----+ +-------+ +-----+
,---------------------------------,
X3S33/X3T56/81-85 | WORKING PAPER |
X3T5/81-171 | This document has not been re- |
X3T51/81-44 | viewed or approved by the appro-|
X3S37/81-71R | priate Technical Committee and |
| does not at this time represent |
| a USA consensus. |
'---------------------------------'
User of (N)-services User of (N)-services
[an (N+1)-entity] [an (N+1)-entity]
\ /
\ /
\ /-----(N)-service-access-points-----\ / (N+1)
-----------o-------------------------------------o------------
\ / (N)
\<-----services provided to------>/
\ (N+1)-layer /
\ /
,------------, ,------------,
| | | |
| (N)-entity |<----"Peers"---->| (N)-entity | (N)-LAYER
| | | |
'------------' '------------'
\ /
\<----services required---->/
\ from (N-1)-layer /
\ / (N)
-------------------o---------------------o--------------------
\ / (N-1)
\ /
\ /
\ /
,--------------------------------,
| |
| |
| (N-1)-LAYER |
| |
| |
'--------------------------------'
(N)- | | (N)- | |
connect | |(N)-connect connect | | (N)-
------->| |indication ------->| | connect
request | | request | |indication
| |-------> | |------->
|(N)-LAYER | |(N)-LAYER |
(N)- | |<------- (N)- | |<-------
connect | | disconnect | | (N)-
<-------| |(N)-connect <-------| |disconnect
confirm | | response indication | | request
| | | |
(N)- | | (N)- | |
data | | (N)-data data | |
------->| |indication ------->| | (N)-
request | | request | | data
| |-------> | |indication
|(N)-LAYER | |(N)-LAYER |------->
| | (N)- | |
| | data | |
| | <-------| |
| | confirm | |
| | | |
(N)-dis | | | |
connect | | (N)- | | (N)-
------->|(N)-LAYER |(N)-disconnect disconnect|(N)-LAYER |disconnect
request | |indication <-------| |------->
| |-------> indication| |indication
| | | |
| |
(N)-data | |
request | |
--------->| |
| (N)-LAYER |
| |--------->
| | (N)-data
| | indication
| |
(N)-data | |
request | |
--------->| |
| | (N)-data
| (N)-LAYER |--------->
| | indication
<---------| |
(N)-data | |
confirm | |
,---------------------, ,---------------------,
| | | |
Level 7 | Application Layer |<---------->| Application Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 6 | Presentation Layer |<---------->| Presentation Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 5 | Session Layer |<---------->| Session Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 4 | Transport Layer |<---------->| Transport Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 3 | Network Layer |<---------->| Network Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 2 | Data Link Layer |<---------->| Data Link Layer |
| | | |
|----------|----------| |----------|----------|
| | | |
Level 1 | Physical Layer |<---------->| Physical Layer |
| | | |
'---------------------' '---------------------'
^ ^ (N+1)-LAYER
| |
| |
----------------o------------------------------o----------------
| |
,-------------------------, ,-------------------------,
| Offers a connectionless | | Offers a connection- |
| (N)-service | | oriented (N)-service |
| | | | | |
| (N)-LAYER | OR | (N)-LAYER |
| | | | | |
| Uses a connection- | | Uses a connectionless |
| oriented (N-1)-service | | (N-1)-service |
'-------------------------' '-------------------------'
| |
----------------o------------------------------o----------------
| |
| |
v v (N-1)-LAYER
^ ^ (N+1)-LAYER
| |
| |
----------------o------------------------------o----------------
| |
,-------------------------, ,-------------------------,
| Offers a connectionless | | Offers a connection- |
| (N)-service | | oriented (N)-service |
| | | | | |
| (N)-LAYER | OR | (N)-LAYER |
| | | | | |
| Uses a connectionless | | Uses a connection- |
| (N-1)-service | | oriented (N-1)-service |
'-------------------------' '-------------------------'
| |
----------------o------------------------------o----------------
| |
| |
v v (N-1)-LAYER
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | | TFTP| ... | ... |
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | UDP | ... | ... |
+-----+ +-----+ +-----+
| | |
+--------------------------+----+
| Internet Protocol & ICMP |
+--------------------------+----+
|
+---------------------------+
| Local Network Protocol |
+---------------------------+
+-------------------------------+
| Internet Protocol & ICMP & GGP|
+-------------------------------+
| |
+---------------+ +---------------+
| Local Net | | Local Net |
+---------------+ +---------------+
0 1 2 3 4 5 6 7
+-----+-----+-----+-----+-----+-----+-----+-----+
| | | | | | |
| PRECEDENCE | D | T | R | 0 | 0 |
| | | | | | |
+-----+-----+-----+-----+-----+-----+-----+-----+
+--------+--------+--------+---------//--------+
|10000011| length | pointer| route data |
+--------+--------+--------+---------//--------+
Type=131
+--------+--------+--------+---------//--------+
|00000111| length | pointer| route data |
+--------+--------+--------+---------//--------+
Type=7
+--------+--------+--------+--------+
|10001000|00000010| Stream ID |
+--------+--------+--------+--------+
Type=136 Length=4
+------+ +-----+ +-----+ +-----+
|Telnet| | FTP | |Voice| ... | | Application Level
+------+ +-----+ +-----+ +-----+
| | | |
+-----+ +-----+ +-----+
| TCP | | RTP | ... | | Host Level
+-----+ +-----+ +-----+
| | |
+-------------------------------+
| Internet Protocol & ICMP | Gateway Level
+-------------------------------+
|
+---------------------------+
| Local Network Protocol | Network Level
+---------------------------+
+--------+--------+---------+--------+
|00000010|00000100| max seg size |
+--------+--------+---------+--------+
Kind=2 Length=4
0 1 2 3 4 5 6 7
+-----+-----+-----+-----+-----+-----+-----+-----+
| | | | | | |
| PRECEDENCE | D | T | R | 0 | 0 |
| | | | | | |
+-----+-----+-----+-----+-----+-----+-----+-----+
+----------------+
| HOST/TERMINAL | AUTODIN II
+----------------+
16
+--------+--------+--------+--------+
| 26 | ZERO | HOST/TERMINAL | IP
+--------+--------+--------+--------+
8 8 16
+--------+--------+--------+
| HOST | ZERO | IMP | ARPANET
+--------+--------+--------+
8 8 8
+--------+--------+--------+--------+
| 10 | HOST | LH | IMP | IP
+--------+--------+--------+--------+
8 8 8 8
+--------+--------+--------+--------+
| 18 | ZERO | HID | PID | IP
+--------+--------+--------+--------+
8 8 8 8
+--------+--------+--------+
| HOST | ZERO | IMP | EDN
+--------+--------+--------+
8 8 8
+--------+--------+--------+--------+
| 21 | HOST | LH | IMP | IP
+--------+--------+--------+--------+
8 8 8 8
+--------+--------+--------+
| SUBNET |RESERVED| HOST | LCSNET
+--------+--------+--------+
8 8 8
+--------+--------+--------+--------+
| 18 | SUBNET |RESERVED| HOST | IP
+--------+--------+--------+--------+
8 8 8 8
+--------+--------+--------+--------+
| net | ZERO | HOST | IP
+--------+--------+--------+--------+
8 8 16
+--------+--------+--------+--------+
| 4 | ZERO | HOST | IP
+--------+--------+--------+--------+
8 8 16
+--------+--------+
| HAP NUM| LCL ADD| WBCNET
+--------+--------+
8 8
+--------+--------+--------+--------+
| 28 | HAP NUM| ZERO | LCL ADD| IP
+--------+--------+--------+--------+
8 8 8 8
----------------------------------------------------------
| 1 | 2 | 3 | 4 | 5 |
| width | width | width | width | length |
----------------------------------------------------------
----------------------------------------------------------
| 6 | 7 | 8 | 9 | 10 |
| length | length | length |x-increment|y-increment|
----------------------------------------------------------
+--------+--------+--------+--------+--------+--------+--------
| length | command| data | data | ... | |
+--------+--------+--------+--------+--------+--------+--------
0100
------------------------>-----------------------------------
| |
| -------------------<------------------------------- |
| | 1 | |
| V | |
---------------- ----------------- | |
| | | | | |
| | 010 | | | |
|->| 2 |---------------------->| 1 |->| | |
| | | | | | | |
0| | B-W | 101 | W-B | |1 | |
|<-| |<----------------------| |<-| | |
| | | | | |
| | ----->| | | |
---------------- | ----------------- | |
| ^ | | | ^ | |
| | ------------>------| | | | | |
| | | 1 | | | | |
| | | | | | ^ V
| | | | | | | |
0111| |1 | | 1000| |1 | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | | 1011 | | | | |
| | | ----------<----------- | | | |
V | | | V | | |
---------------- | ----------------- | |
| |<--- | | | |
| | 0 | | | |
| 3 |<----------------------| 0 |------ |
| | | | |
| B-B | | W-W | |
| |---------------------->| |<---------
| | 0 | |
| | | |
---------------- -----------------
| ^ | ^
| | | |
------ ------
run run
Figure 1.
Non-deterministic finite-state machine diagram for RAPICOM 450
------------------------------------------------------------------
| 24-bit | 37-bit | 512-bit | 12-bit |
|sync code | header | data | checksum |
------------------------------------------------------------------
------------------------------------------------------------------
| 2-bit |5-bit| 10-bit | 12-bit | 3-bit | 3-bit |2-bit|
|seq num|flags|data count| x position|black size|white size|state|
------------------------------------------------------------------
+---------+ +---------+ +---------+
| | Telnet | | Telnet | |
| Local |<-------->| Relay |<-------->| Service |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | Telnet | | Telnet | |
| Local |<-------->| Relay |<-------->| Service |
| Host | NCP | Host | TCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | Telnet | | FTP | |
| Local |<-------->| Relay |<-------->| Service |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+
| | FTP | |
| Local |<-------->| Relay |
| Host | TCP | Host |
+---------+ +---------+
+---------+ +---------+ +---------+
| | SMTP | | SMTP | |
| Source |<-------->| Relay |<-------->| Dest. |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | SMTP | | FTP | |
| Source |<-------->| Relay |<-------->| Dest. |
| Host | TCP | Host | NCP | Host |
+---------+ +---------+ +---------+
+---------+ +---------+ +---------+
| | FTP | | SMTP | |
| Source |<-------->|Forwarder|<-------->| Dest. |
| Host | NCP | Host | TCP | Host |
+---------+ +---------+ +---------+
1 8 9 24
+----------------+---------------------------------+
| | |
| Host number | IMP number |
| | |
+----------------+---------------------------------+
1 16
+--------------------------------+
| |
| 1822L name |
| |
+--------------------------------+
1 2 3 8 9 16
+---+---+------------+----------------+
| | | | |
| 0 | 0 | host # | IMP number |
| | | | |
+---+---+------------+----------------+
Destination Host
Source
Host | 1822 on C/30 | 1822L | 1822 on non-C/30
--------+----------------+----------------+-----------------
| | |
1822 on | 1822 | 1822 | 1822
C/30 | | (note 1) |
| | |
--------+----------------+----------------+-----------------
| | |
| 1822L, using | 1822L, using | 1822L, using
1822L | 1822L name or | 1822L name or | 1822L address
|address (note 2)| address | only (note 2)
| | |
--------+----------------+----------------+-----------------
| | |
1822 on | 1822 | 1822 | 1822
non-C/30| | (note 1) |
| | |
--------+----------------+----------------+-----------------
| | |
----+----------+----------+----
... | x(1,j) | x(1,j+1) | ...
----+----------+----------+----
... | x(2,j) | x(2,j+1) | ...
----+----------+----------+----
| | |
Direction of scan ->
0100
.--------------------->----------------------------------.
| |
| .-----------------<------------------------------. |
| | 1 | |
| V | |
.--------------. .---------------. | |
| | | | | |
| | 010 | | | |
.->| 1 |-------------------->| 2 |->. | |
| | | | | | | |
0| | B-W | 101 | W-B | |1 | |
\<-| |<--------------------| |<-' | |
| | | | | |
| | .---->| | | |
\--------------' | \---------------' | |
| A | | | A | |
| | .--------->------' | | | | |
| | | 1 | | | | |
| | | | | | A V
| | | | | | | |
0111| |1 | | 1000| |1 | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | | 1011 | | | | |
| | | .-------<----------' | | | |
V | | | V | | |
.--------------. | .---------------. | |
| |<--' | | | |
| | 0 | | | |
| 3 |<--------------------| 0 |-----' |
| | | | |
| B-B | | W-W | |
| |-------------------->| |<--------'
| | 0 | |
| | | |
\--------------' \---------------'
| A | A
| | | |
\----' \----'
run run
.-----------. .-----------.
.-----| | | |-----.
| | 9 | | 6 | |
| .-| |<--. .-->| |-. |
| | \-----------' \ / \-----------' | |
1| 0| \ / |1 |0
| | .->Error \ / Error<-. | |
| | 0| \ / |1 | |
| | .-----------. \ / .-----------. | |
| 1 | | | \ / | | | 0 |
| .---| 7 | \ | 10 |---. |
| | | | | / \ | | | | |
| | | \-----------' / \ \-----------' | | |
| | | A / \ A | | |
| | | | / \ | | | |
| | | 1| / \ |0 | | |
| | | .-----------. 0 / \ 1 .-----------. | | |
| | | | |---' \---| | | | |
| | | | 5 | | 8 | | | |
| | | | | | | | | |
| | | \-----------' \-----------' | | |
| | | A A | | |
| | | | | | | |
| | | 1| |0 | | |
| | | .-----------. .-----------. | | |
| | ->| | | |<- | |
| | | 1 | | 2 | | |
| | | B-W |<-----. .----->| W-B | | |
| | \-----------' | | \-----------' | |
| | | A | | A | | |
| | | | |0 1| | | | |
| | \-----' | | \-----' | |
| | 0 .-----------. 0 | |
| | | | | |
| | | 4 | | |
| | RUN | | RUN | |
| | .-----. \-----------' .-----. | |
| | | | A A | | | |
| | | V | | V | | |
| | .-----------. 1 | | 1 .-----------. | |
| \-->| |------' 0 \------| |<--' |
| | 3 |<--------------------| 0 | |
\---->| B-B |-------------------->| W-W |<----'
\-----------' 0 \-----------'
+-----------+--------+-------------------+----------+
| Sync Code | Leader | Data | CRC Code |
+-----------+--------+-------------------+----------+
24 / 37 \ 512 12
.-------' \----------------------.
/ \
+-------+-------+-------+-------+-------+-------+
| Flags | Count | X Pos | Black | White | State |
+-------+-------+-------+-------+-------+-------+
| 7 \ 10 12 3 3 2
| \--------------------------.
| \
+-----+-----+------+-----+-------+-----+
| Seq | RUN | COFB | RPT | Spare | SUB |
+-----+-----+------+-----+-------+-----+
2 1 1 1 1 1
| |
| ************* |
********* ------> * Message * -------> *********
* User * Posting * Transfer * Delivery * User *
* Agent * Protocol * System * Protocol * Agent *
********* <------- ************* <------- *********
| |
| |
Posting Delivery
Slot Slot
Message Flow
Originator --------------------------------> Recipient
bit 7 6 5 4 3 2 1 0
+---------------+
|P 0 x x x x x x| P0xxxxxx uniquely identifies a
+---------------+ data element without a Qualifier.
bit 7 6 5 4 3 2 1 0
+---------------+
|0 x x x x x x x| xxxxxxx is the value.
+---------------+
+---------------+------//-------+
|1 n n n n n n n|y y y y y y y y| nnnnnnn is the
+---------------+------//-------+ number of octets
that contain the
value yyyyyyyy.
+---------------+
|0 0 0 0 1 0 0 1| This is an example with a
+---------------+ value of 9 (decimal).
+---------------+---------------+
|1 0 0 0 0 0 0 1|1 0 0 0 0 0 1 0| This example has a
+---------------+---------------+ value of 130 decimal.
bit 7 6 5 4 3 2 1 0
+---------------+
|0 x x x x x x x| xxxxxxx is the value of the
+---------------+ length code.
+--------+--------+
|10000001|11001001| Length code for 201
+--------+--------+
+--------+--------+--------+
|10000010|00000001 00101100| Length code for 300
+--------+--------+--------+
+--------+
|00011011| Qualifier with value 28 (decimal).
+--------+
+--------+--------+--------+
|10000010|00000001 00001010| Qualifier with value
+--------+--------+--------+ 266 (decimal).
+--------+--------+--------+--------+
|10000011|00000000|00000001 00001010| Vendor-Defined
+--------+--------+--------+--------+ Qualifier with
value 266.
+--------+---//---+----//-----+
|P0000010|Lxxxxxxx|ASCII chars|
+--------+---//---+----//-----+
+--------+---//---+---//---+---//---+
|P1000011|Lxxxxxxx|Qxxxxxxx| bits |
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+--------//--------+
|P1000110|Lxxxxxxx|Qxxxxxxx|Bit-String Element|
+--------+---//---+---//---+--------//--------+
+--------+---//---+------//------+
|P0101000|Lxxxxxxx| ASCII-String |
+--------+---//---+------//------+
+--------+---//---+---//---+--------//--------+
|P1000111|Lxxxxxxx|Qxxxxxxx|Bit-String Element|
+--------+---//---+---//---+--------//--------+
+--------+---//---+---//---+---//---+
|P1111110|Lxxxxxxx|Qxxxxxxx|Anything|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+---//---+
|P1001100|Lxxxxxxx|Qxxxxxxx|elements|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+
|P1001101|Lxxxxxxx|Qxxxxxxx|
+--------+---//---+---//---+
+--------//---------//---------//---------//--------+
| Field, Message, Encrypted, or Compressed Elements |
+--------//---------//---------//---------//--------+
+--------+---//---+-------//--------+
|P0100100|Lxxxxxxx|Property Elements|
+--------+---//---+-------//--------+
+--------+---//---+---//---+---//---+
|P1000101|Lxxxxxxx|Qxxxxxxx|elements|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+---//---+
|P1111111|Lxxxxxxx|Qxxxxxxx|Anything|
+--------+---//---+---//---+---//---+
+--------+---//---+----//-----+
|P0000010|Lxxxxxxx|ASCII chars|
+--------+---//---+----//-----+
+--------+---//---+---//---+---//---+
|P1000011|Lxxxxxxx|Qxxxxxxx| bits |
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+--------//--------+
|P1000110|Lxxxxxxx|Qxxxxxxx|Bit-String Element|
+--------+---//---+---//---+--------//--------+
+--------+---//---+------//------+
|P0101000|Lxxxxxxx| ASCII-String |
+--------+---//---+------//------+
+--------+---//---+---//---+--------//--------+
|P1000111|Lxxxxxxx|Qxxxxxxx|Bit-String Element|
+--------+---//---+---//---+--------//--------+
+--------+---//---+---//---+---//---+
|P1111110|Lxxxxxxx|Qxxxxxxx|Anything|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+---//---+
|P1001100|Lxxxxxxx|Qxxxxxxx|elements|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+
|P1001101|Lxxxxxxx|Qxxxxxxx|
+--------+---//---+---//---+
+--------//---------//---------//---------//--------+
| Field, Message, Encrypted, or Compressed Elements |
+--------//---------//---------//---------//--------+
+--------+---//---+-------//--------+
|P0100100|Lxxxxxxx|Property Elements|
+--------+---//---+-------//--------+
+--------+---//---+---//---+---//---+
|P1000101|Lxxxxxxx|Qxxxxxxx|elements|
+--------+---//---+---//---+---//---+
+--------+---//---+---//---+---//---+
|P1111111|Lxxxxxxx|Qxxxxxxx|Anything|
+--------+---//---+---+---//---+
+========+ +===//===+
| | | |
+========+ +===//===+
always one one or more
octet long octets long
+--------+ +---//---+
| | | |
+--------+ +---//---+
always one one or more
octet long octets long
+========+===//===+---//---+---//---+---//---+
|Pxxxxxxx| Length | Qual | P-List |contents|
+========+===//===+---//---+---//---+---//---+
+--------+--------+--------+--------+--------+
|00100000| 0 5 | 0 1 0 0 0 0
+--------+--------+--------+--------+--------+
+--------+--------+--------+--------+--------+
|00100001| 0 3 | F F F F F F |
+--------+--------+--------+--------+--------+
Bit-String Length Spare
+--------+--------+--------+--------+--------+
|01000011| 0 7 | 0 4 | 0 A 3 B
+--------+--------+--------+--------+--------+
+--------+--------+--------+--------+
5 F 2 9 1 C D 0 |
+--------+--------+--------+--------+
Prop-List Length Property Length PID
+--------+--------+--------+--------+--------+
|00100100| 1 1 |01000101| 0 F | 0 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 0 C |Distribution|
+--------+--------+---- ----+
Property Length PID ASCII Length
+--------+--------+--------+--------+--------+
|01000101| 0 F | 0 2 |00000010| 0 C |
+--------+--------+--------+--------+--------+
Compressed Length CID Bit-String Length
+--------+--------+--------+--------+--------+
|01000110| 0 B | 0 1 |01000011| 0 8 |
+--------+--------+--------+--------+--------+
Spare
+--------+--------+--------+--------+
| 0 0 | 1 C 5 F 2 D
+--------+--------+--------+--------+
+--------+--------+--------+--------+
7 7 B A F 6 2 9 |
+--------+--------+--------+--------+
Encrypted Length EID Bit-String Length
+--------+--------+--------+--------+--------+
|01000111| 0 7 | 0 0 |01000011| 0 4 |
+--------+--------+--------+--------+--------+
Spare
+--------+--------+--------+--------+
| 0 2 | A 3 7 8 1 C |
+--------+--------+--------+--------+
Date Length ASCII Length
+--------+--------+--------+--------+--- ---+
|00101000| 0 A |00000010| 0 8 |19800815|
+--------+--------+--------+--------+--- ---+
Unique-ID Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001001| 0 4 |00100000| 0 2 | 0 0 8 1 |
+--------+--------+--------+--------+--------+--------+
Sequence Length ASCII Length
+--------+--------+--------+--------+--- ---+
|00001010| 1 2 |00000010| 0 7 |This is|
+--------+--------+--------+--------+--- ---+
ASCII Length
+--------+--------+--- ---+
|00000010| 0 7 | a list|
+--------+--------+--- ---+
Set Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001011| 0 8 |00100000| 0 2 | 0 2 0 7 |
+--------+--------+--------+--------+--------+--------+
Integer Length
+--------+--------+--------+--------+
|00100000| 0 2 | 0 0 4 7 |
+--------+--------+--------+--------+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 B | 0 4 |00000010| 1 8 |
+--------+--------+--------+--------+--------+
Message Length Type Field Length
+--------+--------+--------+--------+--------+
|01001101| 5 8 | 0 1 |01001100| 1 7 |
+--------+--------+--------+--------+--------+
FID Date Length ASCII
+--------+--------+--------+--------+
| 0 2 |00101000| 1 4 |00000010|
+--------+--------+--------+--------+
Length
+--------+---- ----+
| 1 2 |19800704-180000EDT|
+--------+---- ----+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 8 | 0 1 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 2 8 | 0 4 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 8 | 0 5 |00000010|
+--------+--------+--------+--------+
Extension Length
+--------+--------+--------+--------+--------+
|01111110| 0 3 | 0 7 | 4 A E 9 |
+--------+--------+--------+--------+--------+
User Length
+--------+--------+--------+--------+--------+
|01111111| 0 3 | 7 2 | P O E |
+--------+--------+--------+--------+--------+
Field Length Keywords ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 4 | 1 4 |00000010| 0 7 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+--- ---+
|00000010| 0 8 |Computer|
+--------+--------+--- ---+
Field Length Text Prop-List Length
+--------+--------+--------+--------+--------+
|11001100| 2 0 | 0 4 |00100100| 0 9 |
+--------+--------+--------+--------+--------+
Property Length PID ASCII
+--------+--------+--------+--------+
|01000101| 0 7 | 0 1 |00000010|
+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 2 |Do you want lunch?|
+--------+--------+---- ----+
Field Length Subject ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 2 1 | 0 7 |00000010| 1 E |
+--------+--------+--------+--------+--------+
Field Length Qualifier User number
+--------+--------+--------+--------+--------+
|11001100| 1 F | 8 2 | 0 0 0 C |
+--------+--------+--------+--------+--------+
Prop-List Length Property Length
+--------+--------+--------+--------+
|00100100| 0 E |01000101| 0 C |
+--------+--------+--------+--------+
PID ASCII Length
+--------+--------+--------+---- ----+
| 0 2 |00000010| 0 9 |Reply-By:|
+--------+--------+--------+---- ----+
Date Length ASCII Length
+--------+--------+--------+--------+
|00101000| 0 A |00000010| 0 8 |
+--------+--------+--------+--------+
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | B 4 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | F 8 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 9 | 0 5 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1030EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 0 | 2 5 |00000010| 0 D |
+--------+--------+--------+--------+--------+
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | B 4 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
Set Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001011| 8 0 |00100000| 0 2 | 0 2 0 7 |
+--------+--------+--------+--------+--------+--------+
Integer Length
+--------+--------+--------+--------+
|00100000| 0 2 | 0 0 4 7 |
+--------+--------+--------+--------+
End-of-Con Length
+--------+--------+
|00000000|00000000|
+--------+--------+
Message Length Type
+--------+--------+--------+
|01001101| 8 0 | 0 1 | +--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
facsimile
machine
+---+ interface
! ! +--+ +-----+
! ! == ! ! == ! ! computer
+---+ +--+ +-----+
|
- - - - - - computer
/ \ network
\ / facsimile
- - - - - - machine
| interface +---+
+-----+ +--+ ! !
computer ! ! == ! ! == ! !
+-----+ +--+ +---+
fitter
+-------------+
+-- ! ! --+
| +-------------+ |
| | |
V V V
+-----+ +-----+ +-----+
! a ! ! b ! ! c !
+-----+ +-----+ +-----+
fitter
+-------------+
+-> ! * -> * -> * ! --+
| +-------------+ |
| | A |
| V | V
+-----+ +-----+ +-----+
! a ! ! b ! ! c !
+-----+ +-----+ +-----+
(0, 0)
+-------------------------------> x
|
| (x0, y0) w
| +--------------------+
| ! !
| ! !
| ! ! h
| ! !
| ! !
| +--------------------+
| (x1, y1)
V
y
|<--- header ---->|<------ 74 bytes ------->|
+--------+--------+-------------------------+
! length ! code ! DACOM block !
+--------+--------+-------------------------+
UCL facsimile
system - - - - - - - -
+--------+ / \ +------+
! ! ---- Cambridge Ring ---- ! PE !
+--------+ \ / +------+
- - - - - - - - |
/ \ |
+------+ +------+ |
! XG ! ! SG ! --- SATNET
+------+ +------+
/ \
PSS SERC NET
X A
|
| (511, 511)
511 +-------------------------------+
| |
| |
| |
| |
| (x, y) |
| + |
| |
| |
| |
| |
| |
+-------------------------------+----->
0 511 Y
(0, 0) width X
+-------------------------+---->
| |
| |
| (x0, y0) |
| +---------+ |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| +---------+ |
| (x1, y1) |
| |
| |
| |
| |
height +-------------------------+
|
|
Y V
(0, 0) width X
+-------------------------+---->
| |
| (x0, y0) |
| +---------+ |
| | | |
| | | |
| | | |
| | | |
| | | |
| +---------+ |
| (x1, y1) |
| |
| |
| (back ground) |
height +-------------------------+
|
|
Y V
+-------------------------+
| |
| upper |
| |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| left XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| XXXXXXXXXXXX |
| width |
| |
+-------------------------+
start of the facsimile data
|
v
+---+------+---+------+-/
!EOL! DATA !EOL! DATA !
+---+------+---+------+-/
end of the facsimile data
|
v
/-+---+------+---+---+---+---+---+---+
!EOL! DATA !EOL!EOL!EOL!EOL!EOL!EOL!
/-+---+------+---+---+---+---+---+---+
|<------ RTC ------->|
start of the facsimile data
|
v
+----+--------+----+--------+-/
!EOL1!DATA(1D)!EOL0!DATA(2D)!
+----+--------+----+--------+-/
end of the facsimile data
|
v
/-+----+--------+----+----+----+----+----+----+
!EOL0!DATA(2D)!EOL1!EOL1!EOL1!EOL1!EOL1!EOL1!
/-+----+--------+----+----+----+----+----+----+
|<--------- RTC --------->|
+--------------+-----------------------------------------------+
|0| NET <-7-> | LOCAL ADDRESS <-24-> |
+--------------+-----------------------------------------------+
+---+--------------------------+-------------------------------+
|1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
+---+--------------------------+-------------------------------+
+-----+----------------------------------------+---------------+
|1 1 0| NET <-21-> | LOCAL ADDRESS |
+-----+----------------------------------------+---------------+
+-+-------------+---------------+--------------+---------------+
|0| 10 | HOST | LOGICAL HOST | IMP |
+-+-------------+---------------+--------------+---------------+
U
/ | \
/ | \ U -- Naming Universe
^ ^ ^ I -- Intermediate Domain
| | | E -- Endpoint Domain
I E I
/ \ |
^ ^ ^
| | |
E E I
/ | \
^ ^ ^
| | |
E E E
+-------------------------------------------------------------+
| |
| This RFC proposes a distributed name service for DARPA |
| Internet. Its purpose is to focus discussion on the |
| subject. It is hoped that a general consensus will |
| emerge leading eventually to the adoption of standards. |
| |
+-------------------------------------------------------------+
Application Application
Process Process
| |
SINS | |
-------|---------------------------------------------|----- Application
| AIP AIP | Interface
| | | | . . . . . . .
| DNS - - - DNS - - - DNS - - . . . - - DNS | Domain Name
----------------------------------------------------------- Service
Application Application
Process Process
| |
SINS | |
-------|---------------------------------------------|-------
| Endpoint Endpoint |
| DNS - - - DNS - - - DNS - - . . . - - DNS |
| |
-------------------------------------------------------------
naming
universe
/ \
--- ARPA (DNS)
/ |
/ SRI (DNS)
/ | \
USC (DNS) TSC (DNS/AIP)
| |
| [TCP/FTP/RFT]
ISI (DNS)
|
D (DNS/AIP)
/ \
[TCP/NIFTP/RFT] [TCP/FTP/RFT]
|
user
SATNET
(partitioned)
ARPANET/SATNET __ __ UCL
Gateway Simp ( \ \ ) Simp Gateway
____ ___( / / )____ ____
| B |__| S1 | \ \ | S2 |________| G |_____ rsre
|____| |____| / / |____| |____|
| ( \ \ ) |
| (__ / /__) _______|____
________|____ ( )
( ) ( )
( ARPANET ) ( UCL NET )
( ) ( )
(_____________) ( )
| | (_____________)
__|_ | VAN/ .
| H | | Public Data Nets .
|____| | _____________ .
Diagnostic | ( ) .
Host __|__ ( VANNET ) _.___
| VAN |* * (* * * * * * * * *)* * * * | |
| gw------(--- IP Tunnel -----)--------| U |
|_____|* * (* * * * * * * * *)* * * |_____|
VAN ( )
Gateway (_____________)
SATNET
(partitioned)
BBN __ __ UCL
Gateway Simp ( \ \ ) Simp Gateway
____ ___( / / )____ ____
| B |__| S1 | \ \ | S2 |________| G |_____ rsre
|____| |____| / / |____| |____|
| ( \ \ ) |
| (__ / /__) _______|____
________|____ ( )
( ) ( )
( ARPANET ) ( UCL NET )
( ) ( )
(_____________) ( )
| | (_____________)
__|_ | |
| H | | Public Data Nets |
|____| | _______________ _|___
Diagnostic | ( ) | M1 |
Host __|__ ( ) |:::::|
| VAN |* * (* * * * * * * * * *) * * |:::::|
| gw------(--- IP Tunnel -----)------------| M2 |
|_____|* * (* * * * * * * * * *) * * |_____|
VAN ( VANNET ) M
Gateway (_______________) "Header
Munger"
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 22 | 7 | 2 | 35 | 64 | 130
l +-----------+-------------+---------+------+------------+
a tcp | 11 | 0 | 1 | 4 | 7 | 23
i +-----------+-------------+---------+------+------------+
m Nothing | 122 | 8 | 1 | 19 | 12 | 162
+-----------+-------------+---------+------+------------+----
155 15 4 58 83 | 315
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 18 | 7 | 0 | 33 | 49 | 107
l +-----------+-------------+---------+------+------------+
a tcp | 12 | 0 | 1 | 4 | 6 | 23
i +-----------+-------------+---------+------+------------+
m Nothing | 133 | 8 | 8 | 21 | 15 | 185
+-----------+-------------+---------+------+------------+----
163 15 9 58 70 | 315
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 5 | 7 | 1 | 35 | 48 | 96
l +-----------+-------------+---------+------+------------+
a tcp | 12 | 0 | 2 | 4 | 5 | 23
i +-----------+-------------+---------+------+------------+
m Nothing | 143 | 8 | 16 | 19 | 10 | 196
+-----------+-------------+---------+------+------------+----
160 15 19 58 63 | 315
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 18 | 6 | 2 | 27 | 77 | 130
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 0 | 4 | 10 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 95 | 8 | 2 | 39 | 16 | 160
+-----------+-------------+---------+------+------------+----
123 14 4 70 103 | 314
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 14 | 6 | 1 | 26 | 60 | 107
l +-----------+-------------+---------+------+------------+
a tcp | 11 | 0 | 2 | 4 | 7 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 104 | 8 | 8 | 40 | 23 | 183
+-----------+-------------+---------+------+------------+----
129 14 11 70 90 | 314
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 6 | 6 | 1 | 26 | 57 | 96
l +-----------+-------------+---------+------+------------+
a tcp | 12 | 0 | 3 | 4 | 5 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 113 | 8 | 13 | 40 | 20 | 194
+-----------+-------------+---------+------+------------+----
131 14 17 70 82 | 314
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 7 | 22 | 2 | 26 | 73 | 130
l +-----------+-------------+---------+------+------------+
a tcp | 11 | 0 | 0 | 4 | 9 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 104 | 17 | 0 | 19 | 20 | 160
+-----------+-------------+---------+------+------------+----
122 39 2 49 102 | 314
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 6 | 21 | 5 | 25 | 50 | 107
l +-----------+-------------+---------+------+------------+
a tcp | 12 | 0 | 2 | 4 | 6 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 112 | 18 | 9 | 20 | 24 | 183
+-----------+-------------+---------+------+------------+----
130 39 16 49 80 | 314
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 5 | 20 | 1 | 14 | 56 | 96
l +-----------+-------------+---------+------+------------+
a tcp | 12 | 0 | 4 | 4 | 4 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 108 | 19 | 14 | 31 | 22 | 194
+-----------+-------------+---------+------+------------+----
125 39 19 49 82 | 314
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 3 | 26 | 4 | 36 | 61 | 130
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 0 | 0 | 4 | 11 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 96 | 10 | 3 | 28 | 23 | 160
+-----------+-------------+---------+------+------------+----
108 36 7 68 95 | 314
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 3 | 24 | 3 | 34 | 43 | 107
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 2 | 4 | 8 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 102 | 12 | 10 | 30 | 29 | 183
+-----------+-------------+---------+------+------------+----
115 36 15 68 80 | 314
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 5 | 25 | 1 | 21 | 44 | 96
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 4 | 4 | 6 | 24
i +-----------+-------------+---------+------+------------+
m Nothing | 98 | 11 | 20 | 43 | 22 | 194
+-----------+-------------+---------+------+------------+----
113 36 25 68 72 | 314
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 13 | 6 | 4 | 23 | 91 | 137
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 0 | 3 | 15 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 64 | 3 | 3 | 37 | 45 | 152
+-----------+-------------+---------+------+------------+----
85 9 7 63 151 | 315
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 13 | 5 | 4 | 21 | 70 | 113
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 0 | 3 | 3 | 11 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 72 | 4 | 10 | 39 | 51 | 176
+-----------+-------------+---------+------+------------+----
94 9 17 63 132 | 315
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 4 | 6 | 0 | 21 | 72 | 103
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 4 | 3 | 9 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 82 | 3 | 19 | 39 | 43 | 186
+-----------+-------------+---------+------+------------+----
96 9 23 63 124 | 315
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 12 | 5 | 2 | 23 | 105 | 147
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 0 | 4 | 15 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 55 | 6 | 0 | 37 | 51 | 149
+-----------+-------------+---------+------+------------+----
75 11 2 64 171 | 323
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 13 | 5 | 1 | 22 | 79 | 120
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 0 | 1 | 4 | 13 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 63 | 6 | 8 | 38 | 61 | 176
+-----------+-------------+---------+------+------------+----
85 11 10 64 153 | 323
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 3 | 5 | 1 | 22 | 79 | 110
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 2 | 4 | 11 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 74 | 6 | 13 | 38 | 55 | 186
+-----------+-------------+---------+------+------------+----
87 11 16 64 145 | 323
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 12 | 7 | 2 | 22 | 104 | 147
l +-----------+-------------+---------+------+------------+
a tcp | 6 | 0 | 0 | 4 | 17 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 53 | 4 | 1 | 40 | 51 | 149
+-----------+-------------+---------+------+------------+----
71 11 3 66 172 | 323
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 11 | 7 | 1 | 19 | 82 | 120
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 2 | 4 | 14 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 61 | 4 | 5 | 43 | 63 | 176
+-----------+-------------+---------+------+------------+----
79 11 8 66 159 | 323
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 3 | 7 | 2 | 20 | 78 | 110
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 2 | 4 | 13 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 70 | 4 | 7 | 42 | 63 | 186
+-----------+-------------+---------+------+------------+----
81 11 11 66 154 | 323
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 9 | 6 | 2 | 20 | 110 | 147
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 1 | 0 | 3 | 16 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 58 | 4 | 1 | 30 | 56 | 149
+-----------+-------------+---------+------+------------+----
74 11 3 53 182 | 323
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 10 | 6 | 2 | 18 | 84 | 120
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 1 | 2 | 3 | 13 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 64 | 4 | 8 | 32 | 68 | 176
+-----------+-------------+---------+------+------------+----
82 11 12 53 165 | 323
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 2 | 6 | 1 | 19 | 82 | 110
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 1 | 2 | 3 | 12 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 76 | 4 | 10 | 31 | 65 | 186
+-----------+-------------+---------+------+------------+----
87 11 13 53 159 | 323
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 13 | 7 | 4 | 29 | 161 | 214
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 0 | 3 | 9 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 42 | 6 | 1 | 33 | 13 | 95
+-----------+-------------+---------+------+------------+----
62 13 5 65 183 | 328
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 11 | 7 | 3 | 27 | 150 | 198
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 2 | 3 | 7 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 50 | 6 | 7 | 35 | 13 | 111
+-----------+-------------+---------+------+------------+----
68 13 12 65 170 | 328
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 6 | 7 | 3 | 26 | 134 | 176
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 1 | 3 | 8 | 20
i +-----------+-------------+---------+------+------------+
m Nothing | 55 | 6 | 8 | 36 | 27 | 132
+-----------+-------------+---------+------+------------+----
69 13 12 65 169 | 328
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 23 | 10 | 3 | 16 | 165 | 217
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 0 | 2 | 9 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 41 | 5 | 1 | 33 | 13 | 93
+-----------+-------------+---------+------+------------+----
72 15 4 51 187 | 329
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 22 | 10 | 2 | 15 | 150 | 199
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 1 | 2 | 8 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 50 | 5 | 6 | 34 | 16 | 111
+-----------+-------------+---------+------+------------+----
80 15 9 51 174 | 329
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 21 | 10 | 2 | 14 | 134 | 181
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 0 | 2 | 9 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 53 | 5 | 9 | 35 | 27 | 129
+-----------+-------------+---------+------+------------+----
82 15 11 51 170 | 329
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 16 | 10 | 5 | 31 | 155 | 217
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 0 | 3 | 9 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 43 | 5 | 1 | 32 | 12 | 93
+-----------+-------------+---------+------+------------+----
66 15 6 66 176 | 329
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 13 | 10 | 4 | 28 | 144 | 199
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 0 | 3 | 9 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 50 | 5 | 5 | 35 | 16 | 111
+-----------+-------------+---------+------+------------+----
70 15 9 66 169 | 329
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 10 | 10 | 9 | 28 | 124 | 181
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 0 | 1 | 3 | 8 | 19
i +-----------+-------------+---------+------+------------+
m Nothing | 57 | 5 | 7 | 35 | 25 | 129
+-----------+-------------+---------+------+------------+----
74 15 17 66 157 | 329
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 16 | 4 | 4 | 29 | 181 | 234
l +-----------+-------------+---------+------+------------+
a tcp | 4 | 1 | 0 | 3 | 2 | 10
i +-----------+-------------+---------+------+------------+
m Nothing | 41 | 2 | 0 | 31 | 7 | 81
+-----------+-------------+---------+------+------------+----
61 7 4 63 190 | 325
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 13 | 4 | 4 | 27 | 173 | 221
l +-----------+-------------+---------+------+------------+
a tcp | 4 | 1 | 0 | 3 | 2 | 10
i +-----------+-------------+---------+------+------------+
m Nothing | 50 | 2 | 3 | 33 | 6 | 94
+-----------+-------------+---------+------+------------+----
67 7 7 63 181 | 325
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 18 | 4 | 4 | 26 | 157 | 209
l +-----------+-------------+---------+------+------------+
a tcp | 4 | 1 | 0 | 3 | 2 | 10
i +-----------+-------------+---------+------+------------+
m Nothing | 47 | 2 | 4 | 34 | 19 | 106
+-----------+-------------+---------+------+------------+----
69 7 8 63 178 | 325
<----------------
\
Process 1 / Process 2
---------------->
One end echoes for itself
<----------------
\
Process 1 / Process 2
---------------->
One end echoes for the other
<----------------
\ /
Process 1 / \ Process 2
---------------->
Both ends echo for themselves
<----------------
\ /
Process 1 / \ Process 2
---------------->
One end echoes for both ends
PROCESS A TELNETconnection PROCESS B Terminal
+-----------+ +---------------+ Timing+-------+
| |WILL TIMING MARK| BUF 1 | Mark | |
| |<---------------|--|-|-|-|-|-|--|<------| |
| | | |-|-|-|-|-| | ^ | |
| | | BUF 2 | ^ | |
| |--------------->|--|-|-|-|-|-|--|------>| |
| | DO TIMING MARK | |-|-|-|-|-| | | |
+-----------+ +---------------+ +-------+
(NVT process).ME;
Figure 1
0 0 0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+---------------+---------------+
0 | R-Message Type| R-Subtype |
+---------------+---------------+
. +---------------+---------------+
. | Modem |
. + State +
. | Data |
. +---------------+---------------+
. : Modem State :
. : Data...... :
+---------------+---------------+
|
+------------------+------------------+
| | |
COLORS FLAVORS TRUTH
| |
+-----+-----+ |
| | | NATURAL
RED BLUE GREEN |
|
+---------------+---------------+
| | |
CHOCOLATE VANILLA STRAWBERRY
+--------+--------+--------+--------------//----------------------+
|<owner> | A | <class>| <class specific address>information |
+--------+--------+--------+--------------//----------------------+
+--------+--------+--------+----------------------------+
|<owner> | MD/MF | <class>| <domain name> |
+--------+--------+--------+----------------------------+
+----------+--------+--------+-----------------------------+
| <owner> | SOA | <class>| <domain name, etc> |
+----------+--------+--------+-----------------------------+
+----------+--------+--------+-----------------------------+
| <owner> | NS | <class>| <domain name> |
+----------+--------+--------+-----------------------------+
|
+------------------+------------------+
| | |
DDN ARPA CSNET
| | |
+-----+-----+ | +-----+-----+
| | | | | |
JCS ARMY NAVY | UDEL UCI
|
+--------+---------------+---------------+--------+
| | | | |
DTI MIT ISI UDEL NBS
| |
+---+---+ +---+---+
| | | | |
DMS AI A B F
|(B.ISI.ARPA)
|(UDEL.CSNET)
+------------------+------------------+
| | |
DDN ARPA CSNET
|(JCS.DDN) |(F.ISI.ARPA) |(UDEL.ARPA)
+-----+-----+ |(A.ISI.ARPA)+-----+-----+
| | | | | |
JCS ARMY NAVY | UDEL UCI
|
+--------+---------------+---------------+--------+
| | | | |
DTI MIT ISI UDEL NBS
|(AI.MIT.ARPA) |(F.ISI.ARPA)
+---+---+ +---+---+
| | | | |
DMS AI A B F
Local Host | Foreign
|
+---------+ +----------+ | +--------+
| | user queries | |queries | | |
| User |-------------->| |---------|->|Foreign |
| Program | | Resolver | | | Name |
| |<--------------| |<--------|--| Server |
| | user responses| |responses| | |
+---------+ +----------+ | +--------+
| A |
cache additions | | references |
V | |
+----------+ |
| database | |
+----------+ |
+--------+--------+--------+--------+
| | | |
| Type | Flags | Message-ID |
| | | |
+--------+--------+--------+--------+
| -
| Resource-List -
| -
+--------+--------+--------+---\\---+
- +
- Resource-List |
- |
+--------+--------+--------+---\\---+
+--------+--------+--------+---\\---+
| | | |
|Protocol|IDLength| Resource-ID |
| | | |
+--------+--------+--------+---\\---+
+--------+--------+--------+--------+---//---+
| | |
|IPLength| IP-Address-List |
| | |
+--------+--------+--------+--------+---//---+
Octets 1 2 3 4 n n+1 p p+1
------------ -------------- -------------- --------
LI| | | | ... | | | .... | | | .... |
------------ -------------- -------------- --------
<--- Fixed Part -----><-- Variable Part->
(including checksum
where applicable)
+----+-------------------------------------------------+----+
| LH | data | TH |
+----+-------------------------------------------------+----+
^ ( ^ ) ^
+----------------+----------------+------~...~----------+
| TYPE | HEADER LENGTH | ORIGINAL HEADER(S) |
+----------------+----------------+------~...~----------+
20
A _______________ F
/ \ \
3 / \10\15
/ \ \
B/___5___\D \E
\ / /
\ / /
1 \ / /5
\/ /
C /
+-------+
| |---------------+---------------+
+---->| Idle | A A
| | |-----------+ | |
| +-------+ | | |
| | A Request | | Cease | Cease
| Start | | Cease | | |
| V | Refuse V | |
| +-------+ Confirm +-------+ Up +-------+
| | |-------->| |-------->| |
| | Aqsn | | Down | Down | Up |
| | |----+ | |<--------| |
| +-------+ | +-------+ +-------+
| | | |
| Stop | | |
| Cease-ack | Stop | Stop | Stop
| +-------+ | | |
| | | V V V
+-----| Cease |<---+--------+-----------------+
| |
+-------+
0 Idle 1 Aqsn 2 Down 3 Up 4 Cease
+-----------+-----------+-----------+-----------+-----------+
Up |0 |1 |3/Poll |3 |4 |
Down |0 |1 |2 |2 |4 |
Request |2/Confirm *|2/Confirm |2/Confirm |2/Confirm |4/Cease |
Confirm |0/Cease **|2 |2 |3 |4 |
Refuse |0/Cease **|0 |2 |3 |4 |
Cease |0/Cease-ack|0/Cease-ack|0/Cease-ack|0/Cease-ack|0/Cease-ack|
Cease-ack |0 |1 |2 |3 |0 |
Hello |0/Cease **|1 |2/I-H-U |3/I-H-U |4 |
I-H-U |0/Cease **|1 |2/Process |3/Process |4 |
Poll |0/Cease **|1 |2 |3/Update |4 |
Update |0/Cease **|1 |2 |3/Process |4 |
Start |1/Request |1/Request |1/Request |1/Request |4 |
Stop/t3 |0 |0 |4/Cease |4/Cease |0 |
t1 |0 |1/Request |2/Hello |3/Hello |4/Cease |
t2 |0 |1 |2 |3/Poll |4 |
+-----------+-----------+-----------+-----------+-----------+
Passive Gateway
Active 0 Idle 1 Aqsn 2 Down 3 Up 4 Cease
Gateway +-----------+-----------+-----------+-----------+-----------+
0 Idle |stable | | | |unstable |
1 Aqsn |unstable |unstable |unstable |unstable |unstable |
2 Down | | |stable |unstable | |
3 Up | | |unstable |stable | |
4 Cease |unstable |unstable |unstable |unstable |unstable |
+-----------+-----------+-----------+-----------+-----------+
# %
? * !
@ )
+------+ +-----+ +----+ $ = ^ +
| |Messages | |Segments | | Datagrams *
| User |<------->| RDP |<------->| IP |<-------> Internet
| | | | | | , ?
+------+ +-----+ +----+ ! )
* % $
@ ^ !
-------------------------------------------------
/ \
/ ARPANET \
\ 10 /
\ /
-------------------------------------------------
| | |
| | |
| | |
+-------------+ +-------------+ +---------------+
| ISI-PNG11 | | | | |
| Arpanet | | ISI-GATEWAY | | ISI-HOBGOBLIN |
| Address | | | | Vax 11/750 |
| logical | | Core EGP | | Unix 4.2 |
| multiplexer | | | | |
+-------------+ +-------------+ +---------------+
| | |
| | |
| | |
--------------- ----------------------------
/ \ / \
/ 3 Mb/s Ethernet \ / ISI-NET \
\ net 10 / \ 128.9 /
\ / \ /
--------------- ----------------------------
|
|
|
+--------------+
| ISI-TROLL |
| Vax 11/750 |
| Unix 4.1a |
| Non-routing |
| | |
| | 9600 | ISI-TROLL, UCI-750A
| | baud | and the link form a
| | link | single logical gateway
| | |
| UCI-750A |
| Vax 11/750 |
| Unix 4.2 |
+--------------+
|
|
|
----------------------
/ \
/ UCI-ICS \
\ 192.5.19 /
\ /
----------------------
______________OSI Network Service Definition______________
| ^
|
| |
Protocol Reference to aims __________|
|
Specification | Reference to assumptions ___
|
| |
|
| |
|
| v
______________Subnetwork Service Definition(s) ___________
Octet
+------------------------------------+
| Network Layer Protocol Identifier | 1
|------------------------------------|
| Length Indicator | 2
|------------------------------------|
| Version/Protocol Id Extension | 3
|------------------------------------|
| Lifetime | 4
|------------------------------------|
|S |M |E/R| Type | 5
| P| S| | |
|------------------------------------|
| Segment Length | 6,7
|------------------------------------|
| Checksum | 8,9
+------------------------------------+
Octet
+--------------------------------------+
| |
| Destination Address Length Indicator | 10
| |
|--------------------------------------|
| | 11
| Destination Address |
| | m-1
|--------------------------------------|
| |
| Source Address Length Indicator | m
| |
|--------------------------------------|
| | m+1
| Source Address |
| | n-1
+--------------------------------------+
Bits 8 7 6 5 4 3 2 1
+---------------------------------------------+
| Octet | Address parameter Length Indicator |
| n | (e.g., 'm') |
|---------------------------------------------|
| Octets | |
| n+1 | Address Parameter Value |
| thru | |
| n+m | |
+---------------------------------------------+
Octet
+------------------------+
| Data Unit Identifier | n,n+1
|------------------------|
| Segment Offset | n+2,n+3
|------------------------|
| Total Length | n+4,n+5
+------------------------+
BITS 8 7 6 5 4 3 2 1
+------------------------------------------+
| Octets | |
| n | Parameter Code |
|------------------------------------------|
| n+1 | Parameter Length (e.g., 'm') |
|------------------------------------------|
| n+2 | Parameter Value |
| n+m+1 | |
+------------------------------------------+
Octet
+--------------------------------------+
| Network Layer Protocol Identifier | 1
|--------------------------------------|
| Length Indicator | 2
|--------------------------------------|
| Version/Protocol Id Extension | 3
|--------------------------------------|
| Lifetime | 4
|--------------------------------------|
|SP|MS|E/R| Type | 5
|--------------------------------------|
| Segment Length | 6,7
|--------------------------------------|
| Checksum | 8,9
|--------------------------------------|
| Destination Address Length Indicator | 10
|--------------------------------------|
| Destination Address | 11 through m-1
|--------------------------------------|
| Source Address Length Indicator | m
|--------------------------------------|
| Source Address | m+1 through n-1
|--------------------------------------|
| Data Unit Identifier | n,n+1
|--------------------------------------|
| Segment Offset | n+2,n+3
|--------------------------------------|
| Total Length | n+4,n+5
|--------------------------------------|
| Options | n+6 through p
|--------------------------------------|
| Data | p+1 through z
+--------------------------------------+
Octet
+--------------------------------------+
| Network Layer Protocol Identifier | 1
|--------------------------------------|
| Length Indicator | 2
|--------------------------------------|
| Version/Protocol Id Extension | 3
|--------------------------------------|
| Lifetime | 4
|--------------------------------------|
|SP|MS|E/R| Type | 5
|--------------------------------------|
| Segment Length | 6,7
|--------------------------------------|
| Checksum | 8,9
|--------------------------------------|
| Destination Address Length Indicator | 10
|--------------------------------------|
| Destination Address | 10 through m-1
|--------------------------------------|
| Source Address Length Indicator | m
|--------------------------------------|
| Source Address | m+1 through n-1
|--------------------------------------|
| Data Unit Identifier | n,n+1
|--------------------------------------|
| Segment Offset | n+2,n+3
|--------------------------------------|
| Total Length | n+4,n+5
|--------------------------------------|
| Options | n+6 through p-1
|--------------------------------------|
| Reason for Discard | p through q-1
|--------------------------------------|
| Error Report Data Field | z
+--------------------------------------+
+---------------------------------------------------------+
| Function | Send | Forward | Receive |
|---------------------------------------------------------|
| PDU Composition | M | - | - |
| PDU Decomposition | M | - | M |
| Header Format Analysis | - | M | M |
| PDU Lifetime Control | - | M | I |
| Route PDU | - | M | - |
| Forward PDU | M | M | - |
| Segment PDU | M | (note 1)| - |
| Reassemble PDU | - | I | M |
| Discard PDU | - | M | M |
| Error Reporting | - | M | M |
| PDU Header Error Detection | M | M | M |
| Padding |(note 2)| (note 2)| (note 2)|
| Security | - | (note 3)| (note 3)|
| Complete Source Routing | - | (note 3)| - |
| Partial Source Routing | - | (note 4)| - |
| Record Route | - | (note 4)| - |
| QoS Maintenance | - | (note 4)| - |
+---------------------------------------------------------+
| STATE |
-------+----------------------------------|
INPUT | CALL | NMBR | SIZE | XFER | EXIT |
-------+----------------------------------|
Greet | 2 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
#NNN | 1 | 3 | 1 | 1 | 6 |
-------+----------------------------------|
=CCC | 1 | 1 | 4 | 1 | 6 |
-------+----------------------------------|
data | 1 | 1 | 1 | 5 | 6 |
-------+----------------------------------|
+ Bye | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
Close | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
other | 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
Timeout| 1 | 1 | 1 | 1 | 6 |
-------+----------------------------------|
| STATE
-------+-----------------------------------------
INPUT | LSTN | AUTH | MBOX | ITEM | NEXT | DONE |
-------+-----------------------------------------|
Open | 2 | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
HELO | 1 | 3 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
FOLD | 1 | 1 | 5 | 5 | 1 | 1 |
-------+-----------------------------------------|
READ | 1 | 1 | 6 | 6 | 1 | 1 |
-------+-----------------------------------------|
RETR | 1 | 1 | 1 | 7 | 1 | 1 |
-------+-----------------------------------------|
ACKS | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
ACKD | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
NACK | 1 | 1 | 1 | 1 | 8 | 1 |
-------+-----------------------------------------|
QUIT | 1 | 4 | 4 | 4 | 1 | 1 |
-------+-----------------------------------------|
Close | 1 | 1 | 1 | 1 | 1 | 9 |
-------+-----------------------------------------|
other | 1 | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
Timeout| | 1 | 1 | 1 | 1 | 1 |
-------+-----------------------------------------|
0 7 8 15 16 31
+--------+--------+--------+--------+
| packet | port | sequence |
| type | number | number |
+--------+--------+--------+--------+
| length | checksum |
| | |
+-----------------+-----------------+
| |
| optional data octets |
+ . . . . . . . . . . . . . . . . . |
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000000|00000000|00000000 00000000|
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000001| unused | snd_una |
+--------+--------+--------+--------+
| 10 | checksum |
+-----------------+-----------------+
| rcv_nxt |
+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000010|port num| snd_nxt |
+--------+--------+--------+--------+
| length | checksum |
+-----------------+-----------------+
| data octet(s) |
+ . . . . . . . . . . . . . . . . . +
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000011|port num| rcv_nxt |
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
0 7 8 15 16 31
+--------+--------+--------+--------+
|00000100|port num| rcv_nxt |
+--------+--------+--------+--------+
| 8 | checksum |
+-----------------+-----------------+
subnetwork point of
attachment identified
________ by SNPA
________________ | | /\
| | |______|/ \_______
| Real End | ____________ Layer | * <-/ |\-> * | Layer
| system, real | | | 3 |______| |______| 3
|subnetwork, or|____| Real | | | | |
| interworking | |Subnetwork| | | | |
| unit | ^ |__________| |______| |______|
|______________| |
|
subnetwork point of End Intermediate
attachment identified System System
by subnetwork address
layer 4
______________________________ 0 _____________________________
\
layer 3 \____NSAP identified
by NSAP address
**************
***** *****
*** ***
*** ***
** ** ** ** <-- Global
** * * .** network
** ** ** . ** addressing
* * * . * domain
* * * . . *
* * * .. . *
* * * .. + *
* * * .. <-----------\
** * * .. + ** |
* + * * ..+ * |
* + * <------------------------------\|
* + * * ... + * |
* + * * ... + * |
* + * * .... + * |
* + * * + * |
* + ************************************ * |
* ********* + + ********* * |
** + + ** |
* + + * |
** + + ** |
* + + <-------------\|
* + + * |
* + + * |
* + + * |
* + + * |
** + + ** |
** + <--\ + ** |
** + \ + ** |
*** + \ + *** |
*** \ *** |
***** \**** |
***************\ Network
\------------- addressing
subdomains
O
|
|
-------------------------------
| | | |
| | | |
----- ----- ----- -----
| W | | X | | Y | | Z |
----- ----- ----- -----
| | |
| | |
--------------- @ --------
| | | | |
| | | | |
----- ----- ----- ----- -----
| a | | b | | c | | a | | b |
----- ----- ----- ----- -----
|
|
----------------------
| | | |
| | | |
----- ----- ----- -----
| p | | q | | r | | s |
----- ----- ----- -----
**************
***** *****
*** ***
*** Z ***
** **
* *
*** ** ** ***
** ** * * ** **
** * ** ** * .**
** ** * * ** r . **
* * * * * . *
X * * * * * . ------------>* Y
* * * * * /. . s +*
* * * * * / .. + *
* * * * * / .. + *
** * * * * b .. + **
* + * * * * | ..+ *
* + * * * * | q + *
* + * ** * ..| + *
* + * * |... + a *
* + * * | p .... + *
* + * * V + *
* + ************************************ *
* ********* ********* *
** **
************************************
********* + + *********
** + + **
* + + *
** + + **
* + + c *
* a + + *
* + + *
* + b + *
* + + *
** + + **
** + + **
** + + **
*** + + ***
*** ***
***** *****
**************
W
NSAP Address Semantics------->Allocation by------->Abstract Syntax
|
|
|-->Representation in--->External
| Humanly-readable Reference
| Directories Syntax
|
|-->Encoding in--------->Concrete Syntax
Protocols
<----------------------NSAP ADDRESS------------------------->
___________________________________________________________
| | |
| IDP | DSP |
|___________|_______________________________________________|
:
:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
:
___________________________________________________________:
| | |
| AFI | IDI |
|___________|_______________________________________________|
___________________
| DSP Syntax |
|___________________|
| | |
__________| Decimal | Binary |
|IDI format| | |
|__________|_________|_________|
| X.121 36 37 |
|______________________________|
| ISO DCC 38 39 |
|______________________________|
| F.69 40 41 |
|______________________________|
| E.163 42 43 |
|______________________________|
| E.164 44 45 |_____________________
|______________________________|Character | National |
|ISO 6523-ICD 46 47 |(ISO 646) |Character |
|______________________________|__________|__________|
| Local 48 49 50 51 |
|____________________________________________________|
___________________
| DSP Syntax |
|___________________|
| | |
__________| Decimal | Binary |
|IDI format| | |
|__________|_________|_________|
| X.121 24 9 |
|______________________________|
| ISO DCC 35 14 |
|______________________________|
| F.69 30 12 |
|______________________________|
| E.163 26 10 |
|______________________________|
| E.164 23 9 |_____________________
|______________________________|Character | National |
|ISO 6523-ICD 34 13 |(ISO 646) |Character |
|______________________________|__________|__________|
| Local 38 15 19 7 |
|____________________________________________________|
_____________________________
| \ a | | | |
| d \ | 0 | 1 | 2 |
|____\___|______|______|______|
| 0 0 1 2 |
|_____________________________|
| 1 3 4 5 |
|_____________________________|
| 2 6 7 8 |
|_____________________________|
________________________________________________________________
| | DSP Abstract | Binary DSP | Decimal DSP |
| IDI Format | syntax | concrete syntax concrete syntax|
|_____________|_______________|_________________|______________|
| | Decimal | 20 octets | 40 digits |
| X.121 | Binary | 17 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| ISO DCC | Binary | 17 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| F.69 | Binary | 17 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| E.163 | Binary | 17 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| E.164 | Binary | 18 octets | 40 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| ISO 6523-ICD| Binary | 16 octets | 39 digits |
| | | | |
| | Decimal | 20 octets | 40 digits |
| LOCAL | Binary | 16 octets | 40 digits |
| | Character | 20 octets | 40 digits |
| |National Char. | 15 octets | 37 digits |
|_____________|_______________|_________________|______________|
+-+------------+--------------+--------------+--------------+
|0| NET <-7-> | LOCAL ADDRESS <-24-> |
+-+------------+--------------+--------------+--------------+
+---+----------+--------------+--------------+--------------+
|1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
+---+----------+--------------+--------------+--------------+
+-----+--------+--------------+--------------+--------------+
|1 1 0| NET <-21-> | LOCAL ADDRESS|
+-----+--------+--------------+--------------+--------------+
+-+------------+--------------+--------------+--------------+
|0| 10 or 26 | HOST | LOGICAL HOST | PSN (IMP) |
+-+------------+--------------+--------------+--------------+
0 16 32
+---------------+---------------+---------------+
| | | |
+---------------+---------------+---------------+
A
decimal point
0 16
+---------------+---------------+
| | |
+---------------+---------------+
A
decimal point
-------------
|/---------\|
|| User || --------
||Interface|<--->| User |
|\----^----/| --------
---------- | | |
|/------\| FTP Commands |/----V----\|
||Server|<---------------->| User ||
|| PI || FTP Replies || PI ||
|\--^---/| |\----^----/|
| | | | | |
-------- |/--V---\| Data |/----V----\| --------
| File |<--->|Server|<---------------->| User |<--->| File |
|System| || DTP || Connection || DTP || |System|
-------- |\------/| |\---------/| --------
---------- -------------
Control ------------ Control
---------->| User-FTP |<-----------
| | User-PI | |
| | "C" | |
V ------------ V
-------------- --------------
| Server-FTP | Data Connection | Server-FTP |
| "A" |<---------------------->| "B" |
-------------- Port (A) Port (B) --------------
+----------------+----------------+----------------+
| Descriptor | Byte Count |
| 8 bits | 16 bits |
+----------------+----------------+----------------+
+--------+--------+--------+
|Descrptr| Byte count |
|code= 16| = 6 |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
+--------+--------+--------+
| Marker | Marker | Marker |
| 8 bits | 8 bits | 8 bits |
+--------+--------+--------+
3 +---+
----------->| E |
| +---+
|
+---+ cmd +---+ 2 +---+
| B |---------->| W |---------->| S |
+---+ --->+---+ +---+
| | |
| | | 4,5 +---+
| 1 | ----------->| F |
----- +---+
------------------------------------
| |
Begin | |
| V |
| +---+ cmd +---+ 2 +---+ |
-->| |------->| |---------->| | |
| | | W | | S |-----|
-->| | -->| |----- | | |
| +---+ | +---+ 4,5 | +---+ |
| | | | | | |
| | | 1| |3 | +---+ |
| | | | | | | | |
| | ---- | ---->| F |-----
| | | | |
| | | +---+
-------------------
|
|
V
End
ftp (host) multics<CR> Connect to host S, port L,
establishing control connections.
<---- 220 Service ready <CRLF>.
username Doe <CR> USER Doe<CRLF>---->
<---- 331 User name ok,
need password<CRLF>.
password mumble <CR> PASS mumble<CRLF>---->
<---- 230 User logged in<CRLF>.
retrieve (local type) ASCII<CR>
(local pathname) test 1 <CR> User-FTP opens local file in ASCII.
(for. pathname) test.pl1<CR> RETR test.pl1<CRLF> ---->
<---- 150 File status okay;
about to open data
connection<CRLF>.
Server makes data connection
to port U.
<---- 226 Closing data connection,
file transfer successful<CRLF>.
type Image<CR> TYPE I<CRLF> ---->
<---- 200 Command OK<CRLF>
store (local type) image<CR>
(local pathname) file dump<CR> User-FTP opens local file in Image.
(for.pathname) >udd>cn>fd<CR> STOR >udd>cn>fd<CRLF> ---->
<---- 550 Access denied<CRLF>
terminate QUIT <CRLF> ---->
Server closes all
connections.
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
END | End-of- | ENDLIST | End-of- | -- | --
| Contents | (11) | Constructor| |
| (0) | | (1) | |
| | | | |
PAD | Null (5) | NOP (0) | No-Op (0) | -- | --
| | PAD (1) | Padding | |
| | | (33) | |
| | | | |
RECORD | Set (17) | PROPLIST | Set (11) | -- | --
| | (14) | | |
| Sequence | LIST (9) | Sequence | Sequence | Structure
| (16) | | (10) | |
| | | | Record |
| | | Message | |
| | | (77) | |
| -- | -- | -- | Array | Fixed Array
| | | | | Counted Array
| "Choice" | -- | -- | Choice |Discriminated-
| "Any" | | | | Union
| | | | |
| "Tagged" | "name" | Field (76) | -- | --
| | |Unique-ID(9)| |
| -- | SHARE-TAG | -- | -- | --
| | (12) | | |
| | SHARE-REF | | |
| | (13) | | |
| | | | |
| -- | -- | Compressed | -- | --
| | | (70) | |
| -- | ENCRYPT | Encrypted | -- | --
| | (14) | (71) | |
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
BOOLEAN| Boolean(1)| BOOLEAN(2)| Boolean(8) | Boolean | Boolean
| | | | |
NUMBER | Integer(2)| EPI (5) | Integer(32)| Integer | Integer
| SV | SV | SV | S16 | S32
| | INDEX (3) | | Cardinal | Unsigned Int
| | U16 | | U16 | U32
| | INTEGER(4)| |Unspecified|Enumeration
| | S32 | | 16 | 32
| | | | Long Int |Hyper Integer
| | | | S32 | S64
| | | | Long Card |Uns Hyper Int
| | | | U32 | U64
| | | | | Double Prec
| | | | | 64
| -- | FLOAT (15)| -- | -- | Float Pt
| | 64 | | | 32
| | | | |
BIT- | Bit String| BITSTR(6) | Bit-String | -- | --
STRING| (3) | | (67) | |
| Octet- | -- | -- | -- | Opaque
| String(4)| | | |
| | | | |
STRING | IA5 (22) | TEXT (8) | ASCII- | String | Counted-
| | | String (2)| | Byte String
| | NAME (7) | | |
| Numeric | | | |
| (18) | | | |
| Printable | | | |
| (19) | | | |
| T.61 (20) | | | |
| Videotex | | | |
| (21) | | | |
Type CCITT MMM NBS XEROX Sun
-----------------------------------------------------------------------
OTHER | UTC Time | -- | Date (40) | -- | --
| (23) | | | |
| Gen Time | | | |
| (24) | | | |
| -- | -- | Property- | -- | --
| | | List (36)| |
| -- | -- |Property(69)| -- | --
| | | | |
| -- | -- | -- | Procedure | --
| | | | |
| -- | -- | Vendor- | -- | --
| | | Defined | |
| | | (127) | |
| | | Extension | |
| | | (126) | |
+---------------------------+---------------------------+
I I I
I I D P I D S P I
I I I
+---------------------------+---------------------------+
: :
: :
V V
+-----+---------------------+
I I I
I AFI I I D I I
I I I
+-----+---------------------+
+-------------+ +-------------+
| TS-user | | TS-user |
+-------------+ +-------------+
| |
| TSAP interface TSAP interface |
| [ISO-8072] |
| |
+------------+ ISO Transport Services on the TCP +------------+
| client |----------------------------------------| server |
+------------+ (this memo) +------------+
| |
| TCP interface TCP interface |
| [RFC-793] |
| |
Octet
+--------------------------------------+ +--------
| Network Layer Protocol Identifier | 1 :
|--------------------------------------| :
| Length Indicator | 2 :
|--------------------------------------| :
| Version/Protocol Id Extension | 3 : Fixed
|--------------------------------------| :
| Lifetime | 4 : Part
|--------------------------------------| :
|SP|MS|E/R| Type | 5 :
|--------------------------------------| :
| Segment Length | 6,7 :
|--------------------------------------| :
| Checksum | 8,9 :
|--------------------------------------| +--------
| Destination Address Length Indicator | 10 :
|--------------------------------------| :
| Destination Address | 11 through m-1 : Address
|--------------------------------------| :
| Source Address Length Indicator | m : Part
|--------------------------------------| :
| Source Address | m+1 through n-1 :
|--------------------------------------| +--------
| Data Unit Identifier | n,n+1 :
|--------------------------------------| : Segment
| Segment Offset | n+2,n+3 : ation
|--------------------------------------| :
| Total Length | n+4,n+5 : Part
|--------------------------------------| +--------
| Options | n+6 through p : Options
Part
|--------------------------------------| +--------
| Data | p+1 through z : Data
+--------------------------------------+ +--------
| |
| Upper-Layer Protocol Modules |
|__________________________________________________________|
--------------------- IP Service Interface -----------------------
__________________________________________________________
| | | |
| | ICMP | IGMP |
| IP |______________|______________|
| Module |
| |
|__________________________________________________________|
---------------- Local Network Service Interface -----------------
__________________________________________________________
| | |
| Local | IP-to-local address mapping |
| Network | (e.g. ARP) |
| Modules |_____________________________|
| (e.g. Ethernet) |
| |
...--------+--------+--------+
MAC Header| Length | 802.{3/4/5} MAC
...--------+--------+--------+
+--------+--------+--------+
| Dsap=K1| Ssap=K1| control| 802.2 SAP
+--------+--------+--------+
+--------+--------+---------+--------+--------+
|protocol id or org code =K2| Ether Type | 802.2 SNAP
+--------+--------+---------+--------+--------+
...--------+--------+--------+
MAC Header| Length | 802.{3/4/5} MAC
...--------+--------+--------+
+--------+--------+--------+
| Dsap=K1| Ssap=K1| control| 802.2 SAP
+--------+--------+--------+
+--------+--------+---------+--------+--------+
|protocol id or org code =K2| Ether Type | 802.2 SNAP
+--------+--------+---------+--------+--------+
--------------------+--- ISO NETWORK SERVICE PROVIDER -----^-----------------
| |
| |
| |
PROTOCOL | REFERENCE TO AIMS -----------------+
|
SPECIFICATION | REFERENCE TO ASSUMPTIONS -----------+
| |
| |
| |
--------------------+---SUBNETWORK SERVICE DEFINITION(S)---v-----------------
_____________________________________________________________________________
| | FULL | NON | INACTIVE |
| FUNCTION | PROTOCOL | SEGMENTING | SUBSET |
| | | SUBSET | |
|________________________________|_____________|_________________|____________|
|PDU Composition | 1 | 1 | 1 |
|PDU Composition | 1 | 1 | 1 |
|Header Format Analysis | 1 | 1 | 1 |
|PDU Lifetime Control | 1 | 1 | N/A |
|Route PDU | 1 | 1 | N/A |
|Forward PDU | 1 | 1 | N/A |
|Segment PDU | 1 | N/A | N/A |
|Reassemble PDU | 1 | N/A | N/A |
|Discard PDU | 1 | 1 | N/A |
|Error Reporting (Note 1) | 1 | 1 | N/A |
|Header Error Detection (Note 1) | 1 | 1 | N/A |
|Security | 1 | 2 | N/A |
|Complete Source Routing | 1 | 2 | N/A |
|Complete Route Recording | 2 | 2 | N/A |
|Partial Source Routing | 3 | 3 | N/A |
|Partial Route Recording | 3 | 3 | N/A |
|Priority | 3 | 3 | N/A |
|QoS Maintenance | 3 | 3 | N/A |
|Congestion Notification | 3 | 3 | N/A |
|Padding | 3 | 3 | N/A |
|________________________________|_____________|_________________|____________|
Part Described in
___________________________________
| Fixed Part | Section 7.2
|_________________________________|
| Address Part | Section 7.3
|_________________________________|
| Segmentation Part | Section 7.4
|_________________________________|
| Options Part | Section 7.5
|_________________________________|
| Data | Section 7.6
|_________________________________|
Octet
________________________________________
| Network Layer Protocol Identifier | 1
|______________________________________|
| Length Indicator | 2
|______________________________________|
| Version/Protocol Id Extension | 3
|______________________________________|
| Lifetime | 4
|______________________________________|
| SP vline M S vline e/R | Type | 5
|______________________________________|
| Segment Length | 6,7
|______________________________________|
| Checksum | 8,9
|______________________________________|
__________________________________________________
| | Bits 5 4 3 2 1 |
|_________|______________________________________|
| DT PDU | 1 1 1 0 0 |
|_________|______________________________________|
| ER PDU | 0 0 0 0 1 |
|_________|______________________________________|
Octet
____________________________________________
| Destination Address Length Indicator | 10
|___________________________________________|
| | 11
: Destination Address :
| | m - 1
|___________________________________________|
| Source Address Length Indicator | m
|___________________________________________|
| | m + 1
: Source Address :
| | n - 1
|___________________________________________|
______________________________________________
| Octet | Address parameter Length Indicator |
| n | (e.g., 'm') |
|________|____________________________________|
| Octets | |
| n + 1 | Address Parameter Value |
| thru | |
| n + m | |
|________|____________________________________|
Octet
________________________
| Data Unit Identifier | n, n + 1
|______________________|
| Segment Offset | n + 2, n + 3
|______________________|
| Total Length | n + 4, n + 5
|______________________|
Octet
___________________________________________________
| | n + 6
: Options :
| | p
|__________________________________________________|
Octets
___________________________________________
| n | Parameter Code |
|____________|____________________________|
| n + 1 | Parameter Length (e.g.m) |
|____________|____________________________|
| n + 2 | |
| to | Parameter Value |
| n + m + 1 | |
|____________|____________________________|
__________________________________________
| Network Layer Protocol Identifier | 1
|________________________________________|
| Length Indicator | 2
|________________________________________|
| Version/Protocol Id Extension | 3
|________________________________________|
| Lifetime | 4
|________________________________________|
| S P vline M S vline e/R | Type | 5
|____________________________|___________|
| Segment Length | 6,7
|________________________________________|
| Checksum | 8,9
|________________________________________|
| Destination Address Length Indicator | 10
|________________________________________|
| | 11
: Destination Address :
|________________________________________| m - 1
| Source Address Length Indicator | m
|________________________________________|
| | m + 1
: Source Address :
| | n - 1
|________________________________________|
| Data Unit Identifier | n, n + 1
|________________________________________|
| Segment Offset | n + 2, n + 3
|________________________________________|
| Total Length | n + 4, n + 5
|________________________________________|
| | n + 6
| Options |
| | p
|________________________________________|
| | p + 1
| Data |
| | z
|________________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|____________________________________________|
| Length Indicator | 2
|____________________________________________|
| Version/Protocol Id Extension | 3
|____________________________________________|
| Lifetime | 4
|____________________________________________|
| SP= 0 vline MS= 0 vline Reserved | Type | 5
|_____________________________________|______|
| Segment Length | 6,7
|____________________________________________|
| Checksum | 8,9
|____________________________________________|
| Destination Address Length Indicator | 10
|____________________________________________|
| | 11
: Destination Address :
| | m - 1
|____________________________________________|
| Source Address Length Indicator | m
|____________________________________________|
| | m + 1
: Source Address :
| | n - 1
|____________________________________________|
| | n
| Options |
| | p - 1
|____________________________________________|
| | p
| Reason for Discard |
| | q - 1
|____________________________________________|
| | q
| Error Report Data Field |
| | z
|____________________________________________|
Octet
________________________________________
| Network Layer Protocol Identifier | 1
|______________________________________|
| Length Indicator | 2
|______________________________________|
| Version/Protocol Id Extension | 3
|______________________________________|
| reserved (must be zero) | 4
|______________________________________|
| 0 |0 |0 | Type | 5
|___|__|__|____________________________|
| Holding Time | 6,7
|______________________________________|
| Checksum | 8,9
|______________________________________|
Octet
____________________________________________
| Network Layer Protocol Identifier | 1
|__________________________________________|
| Length Indicator | 2
|__________________________________________|
| Version/Protocol Id Extension | 3
|__________________________________________|
| reserved (must be zero) | 4
|__________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|_________________________________|
| Holding Time | 6,7
|__________________________________________|
| Checksum | 8,9
|__________________________________________|
| Source Address Length Indicator (SAL) | 10
|__________________________________________|
| | 11
: Source Address (SA) :
| | m - 1
|__________________________________________|
| | m
: Options :
| | p - 1
|__________________________________________|
Octet
_______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
|Network Entity Title Length Indicator (NETL) | 10
|_____________________________________________|
| | 11
: Network Entity Title (NET) :
| | m - 1
|_____________________________________________|
| | m
: Options :
| | p - 1
|_____________________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
| Destination Address Length Indicator (DAL)| 10
|_____________________________________________|
| | 11
: Destination Address (DA) :
| | m - 1
|_____________________________________________|
|Subnetwork Address Length Indicator (BSNPAL) | m
|_____________________________________________|
| | m + 1
: Subnetwork Address (DBSNPA) :
| | n - 1
|_____________________________________________|
|Network Entity Title Length Indicator (NETL) | n
|_____________________________________________|
| | n + 1
: Network Entity Title (NET) :
| | p - 1
|_____________________________________________|
| | p
: Options :
| | q - 1
|_____________________________________________|
Octet
______________________________________________
| Network Layer Protocol Identifier | 1
|_____________________________________________|
| Length Indicator | 2
|_____________________________________________|
| Version/Protocol Id Extension | 3
|_____________________________________________|
| reserved (must be zero) | 4
|_____________________________________________|
|0 |0 |0 | Type | 5
|__|__|__|____________________________________|
| Holding Time | 6,7
|_____________________________________________|
| Checksum | 8,9
|_____________________________________________|
| Destination Address Length Indicator (DAL)| 10
|_____________________________________________|
| | 11
: Destination Address (DA) :
| | m - 1
|_____________________________________________|
|Subnetwork Address Length Indicator (BSNPAL) | m
|_____________________________________________|
| | m + 1
: Subnetwork Address (DBSNPA) :
| | n - 1
|_____________________________________________|
| NETL = 0 | n
|_____________________________________________|
| | n + 1
: Options :
| | p - 1
|_____________________________________________|
| Quality of Service | n + 1
|_____________________________________________|