    Network Working Group                                          J. Postel
    Request for Comments: 885                                            ISI
                                                               December 1983

                          TELNET END OF RECORD OPTION

    This RFC specifies a standard for the ARPA Internet community.  Hosts on
    the ARPA Internet that need to mark record boundaries within Telnet
    protocol data are expected to adopt and implement this standard.

    1.  Command Name and Code

       END-OF-RECORD     25

    2.  Command Meanings

       IAC WILL END-OF-RECORD

          The sender of this command requests permission to begin
          transmission of the Telnet END-OF-RECORD (EOR) code when
          transmitting data characters, or the sender of this command
          confirms it will now begin transmission of EORs with transmitted
          data characters.

       IAC WON'T END-OF-RECORD

          The sender of this command demands to stop transmitting, or to
          refuses to begin transmitting, the EOR code when transmitting data
          characters.

       IAC DO END-OF-RECORD

          The sender of this command requests that the sender of data start
          transmitting the EOR code when transmitting data, or the sender of
          this command confirms that the sender of data is expected to
          transmit EORs.

       IAC DON'T END-OF-RECORD

          The sender of this command demands that the receiver of the
          command stop or not start transmitting EORs when transmitting
          data.

    3.  Default

       WON'T END-OF-RECORD

       DON'T END-OF-RECORD

       END-OF-RECORD is not transmitted.

    Postel                                                          [Page 1]

    RFC 885                                                    December 1983

    4. Motivation for the Option

       Many interactive systems use one (or more) of the normal data
       characters to indicate the end of an effective unit of data (i.e., a
       record), for example, carriage-return (or line-feed, or escape).
       Some systems, however, have some special means of indicating the end
       of an effective data unit, for example, a special key.  This Telnet
       option provides a means of communicating the end of data unit in a
       standard way.

    5.  Description of the Option

       When the END-OF-RECORD option is in effect on the connection between
       a sender of data and the receiver of the data, the sender transmits
       EORs.

       It seems probable that the parties to the Telnet connection will
       transmit EORs in both directions of the Telnet connection if EORs are
       used at all;  however, the use of EORs must be negotiated
       independently for each direction.

       When the END-OF-RECORD option is not in effect, the IAC EOR command
       should be treated as a NOP if received, although IAC EOR should not
       normally be sent in this mode.

    6.  Implementation Considerations

       As the EOR code indicates the end of an effective data unit, Telnet
       should attempt to send the data up to and including the EOR code
       together to promote communication efficiency.

       The end of record is indicated by the IAC EOR 2-octet sequence.  The
       code for EOR is 239 (decimal).

    Postel                                                          [Page 2]