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-
- 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.
-
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- 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).
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- Postel [Page 2]
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