rfc137.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

      Source:  Both Sites
      Meaning: This site has not implemented the following control code.

   Code X'88'

      Source:  Both Sites
      Meaning: [2]Return to control mode, i.e. next byte will be a
               control signal, possible a new DATA TYPE.

   Some special TELNET control signals are required to permit the user
   on some systems to send control information to the using site TELNET
   process.  These do not require a corresponding control code for
   transmission.  The local TELNET control signals are:

      1. Transmit all data to this point.
      2. Suppress transmission of end of line, send all other data.










O'Sullivan                                                      [Page 6]

RFC 137                     TELNET Protocol                   April 1971


   Data is to be forwarded to the NCP for transmission as convenient,
   but at least at the end of line, end of line suppression, and
   transmit signals.  If the normal line length of the sending site is
   greater than the allocation given by the receiving site, the sending
   sites TELNET process or TELNET server will be responsible for
   breaking the line into convenient lengths and turning them over to
   the NCP for transmission.

   This document will be revised as necessary to provide conventions for
   data types, in addition to the NVT ASCII type.

Footnotes:

   [1] A one-byte DATA TYPE signal is sent as the first byte of data
   over a connection.  A default is employed if the first byte over a
   connection has the high order bit set to zero, and it is assumed that
   the seven-bit ASCII NVT convention will be employed.  After initial
   connection, the DATA TYPE may be changed (see code X'88').  Most
   implementations and applications may expect the DATA TYPES to be
   symmetrical at any point in time,(i.e. both using a serving site
   using the same DATA TYPE.).

   [2] A site receiving a DATA TYPE signal is to respond with a double
   X'88' if the new DATA TYPE is acceptable.



























O'Sullivan                                                      [Page 7]

RFC 137                     TELNET Protocol                   April 1971


|<------- 32 ------->|<-8->|<-8->|<-- 16 -->|<-8->|<---
+--------------------+-----+-----+----------+-----+------------------
|       leader       |  x  |size |  count   |  x  | TEXT
+--------------------+-----+-----+----------+-----+------------------
|<---- level 1  ---->|
    message leader

|<------------------  level 2  ------------------>|
                  message preamble

                                                         level 3
                                                  |<- message text..-->

                 Figure 1. Network Message on Link 2-31
           Indicating Portions of Interest to Various Levels






       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    <===>
      /-----------------|                      |-----------------\
     /                  |                      |                  \
                        |                      |
 -----------------------+                      +----------------------

<---> Current TELNET paths
<===> Candidate future TELNET paths

          Figure 2. Current and Candidate Future TELNET Paths





O'Sullivan                                                      [Page 8]

RFC 137                     TELNET Protocol                   April 1971


+---------------------------+----+----+----+----+----+----+----+----+
|\ b8  ->                   | 0  | 0  | 0  | 0  | 0  | 0  | 0  | 0  |
| \ b7  ->                  | 0  | 0  | 0  | 0  | 1  | 1  | 1  | 1  |
|  \ b6  ->                 | 0  | 0  | 1  | 1  | 0  | 0  | 1  | 1  |
|B  \ b5  ->                | 0  | 1  | 0  | 1  | 0  | 1  | 0  | 1  |
| I  +---+---+---+---+------+----+----+----+----+----+----+----+----+
+  T | b | b | b | b |\COL->|    |    |    |    |    |    |    |    |
\   S| 4 | 3 | 2 | 1 | \    |    |    |    |    |    |    |    |    |
 \   |   |   |   |   | |\   | 0  | 1  | 2  | 3  | 4  | 5  | 6  | 7  |
  \  | | | | | | | | | v \  |    |    |    |    |    |    |    |    |
   \ | v | v | v | v |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 |NAC | %  | 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  | S0 | RS | .  | >  | N  | ^  | n  | ~  |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 1 | 1 | 1 |  15  | S1 | US | /  | ?  | O  | _  | o  |DEL |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
         Code Structure      8   7   6   5   4   3   2   1
                        --- --- --- --- --- --- --- --- --- ---





O'Sullivan                                                      [Page 9]

RFC 137                     TELNET Protocol                   April 1971


+---------------------------+----+----+----+----+----+----+----+----+
|\ b8  ->                   | 1  | 1  | 1  | 1  | 1  | 1  | 1  | 1  |
| \ b7  ->                  | 0  | 0  | 0  | 0  | 1  | 1  | 1  | 1  |
|  \ b6  ->                 | 0  | 0  | 1  | 1  | 0  | 0  | 1  | 1  |
|B  \ b5  ->                | 0  | 1  | 0  | 1  | 0  | 1  | 0  | 1  |
| I  +---+---+---+---+------+----+----+----+----+----+----+----+----+
+  T | b | b | b | b |\COL->|    |    |    |    |    |    |    |    |
\   S| 4 | 3 | 2 | 1 | \    |    |    |    |    |    |    |    |    |
 \   |   |   |   |   | |\   | 8  | 9  | 10 | 11 | 12 | 13 | 14 | 15 |
  \  | | | | | | | | | v \  |    |    |    |    |    |    |    |    |
   \ | v | v | v | v |ROW \ |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 0 | 0 | 0 |   0  |'80'|    |'A0'|    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 0 | 0 | 1 |   1  |'81'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 0 | 1 | 0 |   2  |'82'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 0 | 1 | 1 |   3  |'83'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 1 | 0 | 0 |   4  |'84'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 1 | 0 | 1 |   5  |'85'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 1 | 1 | 0 |   6  |'86'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 0 | 1 | 1 | 1 |   7  |'87'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 0 | 0 | 0 |   8  |'88'|    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 0 | 0 | 1 |   9  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 0 | 1 | 0 |  10  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 0 | 1 | 1 |  11  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 1 | 0 | 0 |  12  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 1 | 0 | 1 |  13  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 1 | 1 | 0 |  14  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+
     | 1 | 1 | 1 | 1 |  15  |    |    |    |    |    |    |    |    |
     +---+---+---+---+------+----+----+----+----+----+----+----+----+

 'XX' = HEX designation for codes assigned to TELNET Control Signals.

            Figure 3. Official Network Virtual Terminal Code



O'Sullivan                                                     [Page 10]

RFC 137                     TELNET Protocol                   April 1971


        [This RFC was put into machine readable form for entry]
         [into the online RFC archives by Sergio Kleiman, 8/01]

















































O'Sullivan                                                     [Page 11]