User guide

Chapter 8 – Communication Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 29
V.42bis Data Compression +DS
Description: This command enables or disables V.42bis data compression if this feature is provided on the
PSTN in the IWF.
Syntax: Command syntax: AT+DS=<dir>,<neg>,<P1>,<P2>
Command Possible Responses
AT+DS=3,0,4096,250
Note: Set new parameters
OK
Note: Command valid
AT+DS?
Note: Current values
+DS: 3,0,4096,250
OK
Note: Command valid
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.