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Error Correction and Data Compression

Table 21. V.44/V.42/V.42 bis and MNP Data Modem Command Descriptions (Continued)

Command	Default		Description
		MNP Block Size: This command specifies the maximum number of data bytes in an MNP data frame. A
		smaller frame size may improve throughput on high-impairment (noisy) telephone lines.
		Range: 0–3
\An	3	n = 0	Maximum 64 characters
		n = 1	Maximum 128 characters
		n = 2	Maximum 192 characters
		n = 3*	Maximum 256 characters
		Transmit Break: This command causes the modem to send a break (attention signal) to the remote for
\Bn	3	duration specified by ‘n’. ‘n’ is specified in 100 ms units. When n = 0, the default break length is used.
		Range: 0–9
		Set Auto-Reliable Buffer (requires a license from Microcom*): In auto-reliable mode (+ES=3,0,2), this
		command determines the fallback method and enables data buffering. The settings for this command are
		used by the modem during the V.42 detection phase.
		Range: 0–2
\Cn	0	n = 0*	Does not buffer data.
		n = 1	Reserved.
		n = 2	Does not buffer data. Switches to buffer (normal) mode upon receipt of auto-reliable
			fallback character and passes it to serial port. This feature allows non-V.42 modems to
			connect immediately to a V.42 modem without data loss.
		Set Modem Port Flow Control: In buffer (normal) mode (either +ES=1,0,1 or after fallback), this
		command enables modem-to-modem flow control using XOFF (13h) to stop and XON (11h) to start
\Gn	0	transmission between modems.
		n = 0, 1
		n = 0*	Disables port flow control
		n = 1	Sets port flow control to XON/XOFF
		bps Rate Adjust Control: If this command is enabled, the serial port speed automatically changes to the
		modem-connection speed. This forces the user to change the DTE-to-modem bps rate, if needed. If the
		command is disabled, the serial port speed is independent of the connection speed, which allows much
\Jn	0	greater throughput when using error correction and data compression.
		n = 0, 1
		n = 0*	Turns off feature
		n = 1	Turns on feature

NOTE: An asterisk (*) denotes the factory-default setting.

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