Multi-Tech Systems CDMA Wireless Modem manual V42 Bis Data Compression +DS, At+Ds?

Chapter 10 – Data Commands

V42 Bis Data Compression +DS

Description: This command enables or disables V.42bis data compression if this feature is provided on the PSTN in the IWF.

Values: Four numeric sub-parameters are accepted:

<dir >: specifies the desired direction(s) of operation of the data compression function; from the DTE point of view, (default is 3),

0: Negotiated … no compression

1: Transmit only

2: Receive only

3: Both directions, accept any direction

<neg >: specifies whether or not the DCE should continue to operate if the desired result is not obtained, (default is 0),

0: Do not disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>

1: Disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>

<P1 >

512-4096: specifies the maximum number of dictionary entries that should be negotiated, (default is 4096),

< P2 >

	6-250: specifies the maximum string length to be negotiated, (default is 250).
Syntax:	Command syntax: AT+DS=<dir>,<neg>,<P1>,<P2>
	Command	Possible Responses
	AT+DS=3,0,4096,250	OK
	Note: Set new parameters	Note: Command valid
	AT+DS?	+DS: 3,0,4096,250
	Note: Current values	OK
		Note: Command valid

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 74