Chapter 10 – Data Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 74
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
Note: Set new parameters
OK
Note: Command valid
AT+DS?
Note: Current values
+DS: 3,0,4096,250
OK
Note: Command valid