User guide

Developers guidelines | AT commands
91 June 2010
AT+CV120 V.120 rate adaption protocol
Description: Sets the values of the V.120 protocol parameters (defined in CCITT V.120)
that are carried in the GSM BC and/or LLC information elements.
Test command returns values supported by the TA as a compound value.
Set command: AT+CV120=[<rah>[,<mfm>[,<mode>[,<llineg>[,<assign>[,<negtype>]]]]]]
Read command: AT+CV120? Displays the current <n> and <m> settings.
Read command
response: +CV120: <rah>,<mfm>,<mode>,<llineg>,<assign>,<negtype>
Test command: AT+CV120=? Shows if the command is supported.
Test command
response: +CV120: (list of supported <rah>s),(list of supported <mfm>s),(list of
supported <mode>s),(list of supported <llineg>s),(list of supported
<assign>s),(list of supported <negtype>s)
Parameters:
<rah>:
<rah> Description
0 Rate adaption header not included
1 Rate adaption header included (mandatory for
protocol sensitive modes)
<mfm>:
<mfm> Description
0 Multiple frame establishment not supported, only UI
frames allowed
1 Multiple frame establishment supported, both I and
UI frames allowed
<mode>:
<mode> Description
0 Bit transparent mode of operation
1 Protocol sensitive mode of operation
<llineg>:
<llineg> Description
0 No negotiation, LLI = 256 only
1 Negotiation allowed.
Note: <negtype> indicates the connection over
which the negotiation is performed
<assign>:
<assign> Description
0 Message originator is “default assignee”
1 Message originator is “assignor only”
<negtype>: