User guide

Developers guidelines | AT commands
99 June 2010
AT+CHSN HSCSD non-transparent call configuration (ver. 2)
<codings> Description
4 Indicates that the accepted channel coding for the
next established non-transparent HSCSD call is 9.6
Kbps
8 Indicates that the accepted channel coding for the
next established non-transparent HSCSD call is
14.4 Kbps
12 Indicates that the accepted channel codings for the
next established non-transparent HSCSD call are
both 9.6 Kbps and 14.4 Kbps. Default value
Description: Controls parameters for non-transparent HSCSD calls. Changing <topRx>
or <codings> during a call does not affect the current call. Changing
<wAiur> or <wRx> affects the current call only if <topRx> was non-zero
when the call was established. (When using the command in this way it
comes in the “action” command category). This is what is referred to as
User initiated modification in GSM 22.034 and User initiated upgrading
and downgrading in GSM 23.034.
Note: Recommended value for parameter <speed> in AT+CBST is 0.
Set command: AT+CHSN=[<wAiur>[,<wRx>[,<topRx>[,<codings>]]]]
Read command: AT+CHSN? Displays the current setting.
Read command
response: +CHSN: <wAiur>, <wRx>, <topRx>, <codings>
Test command: AT+CHSN=? Shows if the command is supported.
Test command
response: +CHSN: (list of supported <wAiur>s), (list of supported <wRx>s),
(list of supported <topRx>s), (list of supported <codings>s)
Parameters:
<wAiur>:
<wAiur> Description
0 TA/ME calculates a proper number of receive time
slots from currently selected fixed network user rate
(<speed> parameter from AT+CBST command, ref
and <codings> and <wRx> (or <maxRx> from
AT+CHSD command if <wRx>=0). See note below.
Default value
1 Wanted air interface user rate is 9.6 Kbps
2 Wanted air interface user rate is 14.4 Kbps
3 Wanted air interface user rate is 19.2 Kbps
4 Wanted air interface user rate is 28.8 Kbps
6 Wanted air interface user rate is 43.2 Kbps, UMTS
only
7 Wanted air interface user rate is 57.6 Kbps, UMTS
only