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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
		Data Compression Reporting: Controls whether the “+DR:” result code is transmitted from the DCE to
		DTE once a connection with has been made. If enabled the result code displayed shall represent the
		current negotiated DCE-DCE data compression type and is issued after the Error Control Report (+ER)
		and before the final result code CONNECT. +DR accepts one numeric parameter decimal value and the
		format is as follows:
		0	Disables Data compression reporting—No +DR result code transmitted
		1	Enables Data compression reporting—+DR result code transmitted
+DR=m	0
		Display messages when +DR = 1,
		+DR: NONE		Data compression not in use
		+DR: V42B		V.42 bis is in use in both directions
		+DR: V42B RD		V.42 bis is in use in receive direction only
		+DR: V42B TD		V.42 bis is in use in transmit direction only
		+DR: MNP5		MNP5 in use
		Data Compression: This command sets multiple parameters for the control of data compression.
		m = <direction>, <compression negotiation>, <max dict>, <max string> Default: m = 3, 0, 2048, 6
		<direction>	Specifies the direction of the data compression from the DTEs point of view.
		Range: <direction> = 0–3
		Default: <direction> = 3
		<direction> = 0		Negotiated, no compression
		<direction> = 1		Transmit only
		<direction> = 2		Receive only
		<direction> = 3*		Both directions, accept any direction
		<compression negotiation>Specifies whether the modem should stay connected or disconnect based
+DS=m	see ‘m’	on the desired result.
		Range: <compression negotiation> = 0, 1
		Default: <compression negotiation> = 0
		<compression negotiation> = 0*			Do not disconnect
		<compression negotiation> = 1			Disconnect
		<max dictionary> Specifies the maximum number of dictionary entries that should be negotiated.
		Range: <max dictionary> = 512 to 65535
		Default: <max dictionary> = 2048
		<max string>		Specifies the maximum string length to be negotiated.
		Range: <max string> = 6–250
		Default: <max string> = 6
NOTE: An asterisk (*) denotes the factory-default setting.

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