Black Box 3600 MODEM manual Maximum Reliable Block Size \A, Transmit Break / Set Break Length \B

Protocols

Maximum Reliable Block Size \A

The \A command sets the maximum transmit block size for MNP connections. Use this command to force the modem to transmit smaller blocks in an MNP connection. A smaller block size maximizes throughput when marginal line conditions are causing errors. The modem sends a block up to the size specified by the \A command.

Command	Operation
\A	Maximum transmit block size = 64 characters
\A1	Maximum transmit block size = 128 characters
\A2	Maximum transmit block size = 192 characters
\A3	Maximum transmit block size = 256 characters

Transmit Break / Set Break Length \B

The \B commands tell the local modem to send a break signal to the remote modem. In all modes except direct, S79 determines the length of the break sent to the DTE by the modem receiving a break signal over the link. S79 may be set directly or via \Bn where n=1-255 in 20 ms increments. The default is 35 (700 ms).

Command	Operation
\B	Sends a break signal to the remote modem (does not
	modify S79)
\Bn	Sets S79 to length of break desired; n=1-255 in 20
	ms increments; default= 35 (700 ms)

Set Auto-Reliable Buffer \C

This determines whether or not a modem in reliable mode will buffer data received from a modem that is not in reliable mode during the 4 seconds in which the modems try to establish a reliable link. Use these commands when the modem is in the auto-reliable mode and is expected to process a call from a modem not in a reliable mode.

Command	Operation
\C	Disable auto reliable data buffer
\C1	Buffer data for 4 seconds or 200 characters

Modem 3600 6-11