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Printable Version: RFC929.PDF
RFC 929 December 1984
Proposed Host-Front End Protocol
,, Skip the Foreign Address Primary Component
5 Mediation Level is 5
N Non Blocking Transmits
-fc Skips over parameters up to Flow Control Advice
S Small Blocks are appropriate for Telnet
-pi Skips over parameters to the Protocol Idiosyncratic
List of Options to be Handled by the Host.
9 Option Code for Line Length Option
Here, no remote address component was specified, since the
Host will accept connections from any Host. Similarly, no
local addresses are specified, since the default well-known
socket for this Host is to be used. In this example, the
Host specifies it will handle the line length option (number
9). Other options are handled in the OPE.
An example of an active Begin for an outboard Telnet
protocol is:
C BE TEL A ISIA 5 N -fc 0 -pi 9
This command is identical to the passive command, except
that a remote primary address component is specified to
identify the intended Host. No remote secondary component
is specified, since the well-known socket at that Host is to
be used. No local secondary address components are
specified, since the connection can originate from any
available socket of the appropriate type selected by the
OPE.
2.2. The Transmit Command
The Transmit Command is used to send data across a Telnet
connection.
2.2.1. Specialized Usage
The Transmit command is used to transmit data over the
Telnet connection. There is one specialized aspect of the
Transmit command used with an outboard Telnet interpreter.
This is the provision of the Go Ahead feature of Telnet that
supports half-duplex devices.
Go Ahead is provided as a protocol idiosyncratic parameter
to the Transmit. It is only used if the Host will support
it, however. It is our opinion that Go Ahead is probably
not a proper thing for the default case.
Lilienkamp & Mandell & Padlipsky [Page 44]