Cabletron Systems CSMIM-T1 manual Cn Auto-Reliable Buffer, C0

Chapter 7: AT Commands and Registers

\Cn	Auto-Reliable Buffer
\C0	Does not buffer data during link negotiation. Switches to normal
	or direct mode if no SYN character is detected within 3 seconds.
\C1	Buffers all data on the answering modem until it receives either
	200 non-SYN characters or a SYN character within 3 seconds
	(this delay is longer for modem speeds 300 or below). If it
	receives 200 non-SYN characters, the modem switches to normal
	mode and passes the data through to the serial port. If it detects a
	SYN character within 3 seconds, it attempts to establish a reliable
	connection. Otherwise, it switches to normal mode.
\C2	Does not buffer data on the answering modem. Switches to
	normal mode upon receipt of a character defined by the AT%A
	command and passes that character to the serial port.
	Determines if the answering modem set to auto-reliable mode and
	auto-answer buffers data from the remote modem during the 3
	seconds when it tries to establish a reliable connection. When the
	modem receives calls both from modems that support MNP and
	from modems that do not, set \C2. This allows the modem to
	switch to normal mode as soon as it detects a log-on character
	(defined by %A) from a non-MNP caller. This eliminates the
	3-second wait. (See the \N command description for more
	information about auto-reliable and normal modes.)
	For example, use %A to set the auto-reliable fallback character to
	ASCII 13 (carriage return). Then set \C2\N3. Non-MNP callers
	who connect and press to log on do not have to wait for the
	3-second auto-reliable window to expire before data can pass.

NOTES

When either \ C1 or \ C2 is set, reliable and normal connections may result independent of bps rate adjust. However, when \C0 is set bps rate adjust affects the type of connection as follows:

Reliable and direct connections may result when bps rate adjust is On (\ J1).

Reliable and normal connections may result when bps rate adjust is Off (\ J0).

When falling back to V.23 full duplex connections and either \C1 or \C2 is set, reliable and normal connections may result independent of the \W command.

7-6 CSMIM-T1 Hardware Installation Guide