User guide

Developers guidelines | AT commands
98 June 2010
Ensemble S5: GSM HSCSD
Commands
AT+CHSD HSCSD device parameters (ver. 2)
Description: The execution command returns information about HSCSD features (refer
to GSM 02.34) supported by the ME.
The test command does not return any values, only OK to show that the
command is supported.
Execution
command: AT+CHSD
Execution command
response: +CHSD: <mclass>,<maxRx>,<maxTx>,<sum>,<codings>
Test command: AT+CHSD=? Shows if the command is supported.
Parameters:
<mclass>:
<mclass> Description
8 Multislot class 8
<maxRx>:
<maxRx> Description
4 Maximum number of receive timeslots that is
supported by the MS
<maxTx>:
<maxTx> Description
1 Maximum number of transmit timeslots that is
supported by the MS
<sum>:
<sum> Description
5 Total number of receive and transmit timeslots that
ME can support at the same time is 5 (that is, 4+1).
The following applies in a HSCSD call: 2 <= (receive
slots) + (transmit slots) <= <sum>
<codings>: This is a sum of integers each representing a supported channel coding.
For example, value 12 indicates that 9.6 Kbps and 14.4 Kbps are sup-
ported