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V.42 bis Data Compression +DS
This command enables or disables V.42bis data compression if this feature is provided on the PSTN in the
Description:
IWF.
Four numeric sub-parameters are accepted:
Values:
<dir>
<neg> specifies whether or not the DCE should continue to operate if the desired result is not obtained.
<P1>
<P2>
Command syntax: AT+DS=<dir>,<neg>,<P1>,<P2>
Syntax:
Command
AT+DS=3,0,4096,250
Note: Set new parameters
AT+DS?
Note: Current values
V.42 bis Data Compression Report +DR
This command returns the results of data compression capability. If data reporting is enabled, this command
Description:
returns the data compression type of an incoming or outgoing data call. Otherwise, the command returns
NONE.
The intermediate result code represents current DCE-DCE data compression type. The syntax for +DR
reporting is: +DR<result>, and the result code is defined as follows:
+DR: NONE
+DR: V42B
+DR: V42B RD
+DR: V42B TD
The +DR intermediate result code, if enabled, is issued before the final result code, before the +ILRR
intermediate report and after the service report control +CR.
This syntax is for setting the +DR reporting method.
Values:
<val>
Disable reporting
0
Enable reporting
1
Command syntax: AT+DR=<val>
Syntax:
Command
AT+DR=1
Note: Reporting enabled
AT+DR?
Note: Display the current value
AT+DR=?
Note: Display the supported values
Multi-Tech Systems, Inc. CDMA Wireless AT Commands (PN S000294J)
specifies the desired direction(s) of operation of the data compression function; from the DTE point
of view. Default is 3.
Negotiated ... no compression
0
Transmit only
1
Receive only
2
Both directions, accept any direction
3
Default is 0
Do not disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>
0
Disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>
1
512-4096 Specifies the maximum number of dictionary entries that should be negotiated.
Default is 4096.
Specifies the maximum string length to be negotiated. Default is 250.
6-250
Data compression is not in use
Rec. V.42 bis is in use in both directions
Rec. V.42 bis is in use in receive direction only
Rec. V.42 bis is in use in transmit direction only
Possible Responses
OK
Note: Command valid
+DS: 3,0,4096,250
OK
Note: Command valid
Possible Responses
OK
Note: Command valid
+DR: 1
OK
Note: Command valid
+DR: (0,1)
OK
Note: Command valid
Chapter 9 – Data Commands
57
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