
Chapter 8 – Communication Commands
V.42bis Data Compression +DS
Description:
Syntax:
This command enables or disables V.42bis data compression if this feature is provided on the
PSTN in the IWF.
Command syntax: AT+DS=<dir>,<neg>,<P1>,<P2>
Command
AT+DS=3,0,4096,250
Note: Set new parameters
AT+DS?
Note: Current values
Possible Responses
OK
Note: Command valid
+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
1
2
3
Negotiated … no compression
Transmit only
Receive only
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
<P1>
0
1
Do not disconnect if V.42 bis is not negotiated by the remote DCE as specified in
<dir>
Disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>
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 .
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C)
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