Telnet Remote Serial Port (RSP) Option

Document Type Expired Internet-Draft (individual)
Authors Russ Barnes  , Murray Bennett 
Last updated 1997-09-10 (latest revision 1998-03-17)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Many (if not all) terminal servers support the ability to set up a telnet listener on a serial port. This allows a connection to a port to be made via the network, however only (two way) data can be transferred between the client and the port. By using the Remote Serial Port (RSP) telnet option, the client is able to control non-data aspects of the port such as baud rate and modem signals. This is especially important where the port is attached to a modem and modem signals are required to hangup the modem. This document defines a simple protocol which allows terminal servers (and other systems which provide access to serial ports via a network connection) to provide access to these features.


Russ Barnes (
Murray Bennett (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)