AT command interface
Version 8 dated 15.03.00
48
Siemens Information and Communication Products
AT+DS
V.42bis data compression control
Test command
AT+DS=?
Response
+DS: (list of supported <p0>s), (list of supported <n>s), (list of supported <p1>s), (list of suppor-
ted <p2>s) OK
Parameter
see set command
Read command
AT+DS?
Response
+DR: <p0>,<n>,<p1>,<p2> OK
Parameter
see set command
Set command
AT+DS=[<p0>[,<
n>[,<p1>[,<p2>]]]]
Response
This parameter setting determines the possible data compression mode by TA at the compression
negotiation with the remote TA after call setup.
Note1
: only for data call
Note2
: GSM transmits the data transparent. The remote TA may support this compression.
OK
Parameter
Note:
see also ITU V.42bis
<p0>
0
NONE
1
transmit only
2
receive only
3
both directions, but allow negotiation
<n>
0
allow negotiation of p0 down
1
do not allow negotiation of p0 – disconnect on difference
<p1>
512-1024
dictionary size
Note:
default determined by manufacturer
<p2>
6-64
maximum string size
Reference
V.25ter
Note
Functionality depends on network
AT+GCAP
Request complete TA capabilities list
Test command
AT+GCAP=?
Response
OK
Parameter
Execute command
AT+GCAP
Response
TA reports a list of additional capabilities.
+GCAP: <name>
OK
Parameter
<name>
e.g.: +CGSM, +FCLASS, +DS, +DR
Reference
V.25ter
Note