GENWiki

Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools


rfc:rfc885

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]

/data/webs/external/dokuwiki/data/pages/rfc/rfc885.txt · Last modified: 1992/09/23 20:22 by 127.0.0.1

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki