1  –  AUTOFLUSH

    Enables the automatic flushing of output when you send the
    interrupt character.

    o  Enabled - The data in the data buffer remains visible until
       the buffer is empty.

    o  Disabled - The data buffer is emptied and the display is
       terminated. This provides fast system response to the
       interrupt character.

    Default: ENABLE AUTOFLUSH

    DCL Format

      ENABLE AUTOFLUSH

    UNIX Format

      toggle autoflush

2  –  AUTOSYNCH

    Enables the sending of the synchronization and interrupt
    characters in urgent mode.

    o  Enabled - The local host sends an interrupt character in
       urgent mode, and the remote host immediately processes it.

    o  Disabled - TELNET sends the interrupt character in sequence
       with the other characters in the stream, and the remote host
       processes this character in the sequence received.

    Default: DISABLE AUTOSYNCH.

    DCL Format

      ENABLE AUTOSYNCH

    UNIX Format

      toggle autosynch

3  –  BINARY

    Enables the transmission of data in binary mode.

    o  Enabled - The EOL (end-of-line) character is not mapped to
       Return LF (the carriage return/line feed combination).

       Use ENABLE BINARY when the remote host expects each line to
       end with a carriage return/line feed combination.

       Binary mode provides interaction when the remote host:

       -  Expects special characters.

       -  Does not support automatic negotiation of the TELNET binary
          option.

    o  Disabled - EOL is sent as Return LF (the carriage return/line
       feed combination).

    Default: DISABLE BINARY

    DCL Format

      ENABLE BINARY

    UNIX Format

      toggle binary

4  –  CRLF

    Enables the sending of carriage returns as Return LF (the
    carriage return/line feed combination) at the end of each line.

    o  Use ENABLE CRLF if the remote host expects Return LF at the
       end of each line.

    o  Use DISABLE CRLF if the remote host interprets Return as
       Return LF, which is CR mode.

    Default: ENABLE CRLF

    DCL Format

      ENABLE CRLF

    UNIX Format

      toggle crlf

5  –  CRMOD

    Enables the mapping of received carriage returns. With this
    mapping, the remote host sends each line with Return LF (the
    carriage return/line feed combination) at the end of each line.

    o  Use ENABLE CRMOD if your terminal expects each line to end
       with Return LF.

    o  Use DISABLE CRMOD if your terminal expects Return null at the
       end of each line.

    Default: DISABLE CRMOD

    DCL Format

      ENABLE CRMOD

    UNIX Format

      toggle crmod

6  –  DEBUG

    Enables the display of data in hexadecimal.

    o  Enabled - Data is displayed in both hexadecimal and readable
       text.

    o  Disabled - Data is displayed in readable text.

    Default: DISABLE DEBUG

    DCL Format

      ENABLE DEBUG

    UNIX Format

      toggle netdata

6.1  –  Example

  % <Ctrl/Z>  (characters not echoed)
  TELNET> enable debug <Return>
  TELNET> display <Return>
     .
     .
     .
  Will print network data flow in hexadecimal
  .
  .
  .
  TELNET>)resume <Return>
  SEND [   0] D A
  RCVD [   0] D A
  RCVD [   0] 746E7069782E6C6B672E6465632E636F6D3E20
  % ls <Return>
  SEND [   0] 6C
  RCVD [   0] 6C l
  SEND [   0] 73
  RCVD [   0] 73 s
  SEND [   0] D A
  RCVD [   0] D A
  RCVD [   0] 62696E20202020202020...
  RCVD [  32] 7074 D A
  french.estud.oiseau     russian.estud.ptitsa     fences
  typescript     verio
  %

      Escapes from a session with a UNIX host, enables debug mode,
      resumes the session, and asks for a list of files in the
      working directory. Both hexadecimal data and readable data
      are displayed.

7  –  LOCAL_CHARS

    Enables the translation of the following terminal control
    characters in to TELNET protocol sequences:

    o  Interrupt

    o  Flush Output

    o  Are You There

    o  Kill

    o  Erase

    o  Quit

    With local characters:

    o  Enabled - The local host sends the control characters (in the
       preceding text) translated into TELNET sequences. For example,
       Ctrl/T becomes IAC AYT.

       Enabled mode is appropriate when the remote and local hosts
       implement different control characters. The remote host does
       not recognize certain control characters. Therefore, the local
       host interprets these control characters before sending them
       to the remote host.

    o  Disabled - The local host sends these control characters
       uninterpreted. They are interpreted by the remote host.

       Before you communicate in disabled mode, ensure that the
       remote and local hosts use the same control characters.

    Default: DISABLE LOCAL_CHARS

    DCL Format

      ENABLE LOCAL_CHARS

    UNIX Format

      toggle localchars

8  –  OPTIONS_VIEW

    Enables the display of option negotiations between the local
    system and the remote host during the session.

    o  Enabled - TELNET displays the option negotiations between your
       local system and the remote host.

    o  Disabled - TELNET does not display the option negotiations.
       This mode is suitable for most communications.

    Default: DISABLE OPTIONS_VIEW

    DCL Format

      ENABLE OPTIONS_VIEW

    UNIX Format

      toggle options