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7. DATA - HSCSD
173
LZT 123 7263 R1C
7.3 AT+CHSN HSCSD Non Transparent Call Configuration
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 up- and down-grading in GSM 02.34 and
GSM 03.34.
Note! Recommended value for parameter <speed> in AT+CBST is 0.
Description Command Possible Responses
Set HSCSD
configuration. This
command is also used
during a call if new
<wAiur> and/or <wRx>
are/is desired
AT+CHSN=[<wAiur>
[,<wRx>[,<topRx>
[,<codings>]]]]
• +CME ERROR: <err>
•OK
•ERROR
Show the current
setting
AT+CHSN? • +CHSN: <wAiur>,
<wRx>, <topRx>,
<codings>
• +CME ERROR: <err>
•OK
•ERROR
Show if the command
is supported
AT+CHSN=? • +CHSN: (list of
supported <wAiur>s),
(list of supported
<wRx>s), (list of
supported <topRx>s),
(list of supported
<codings>s)
• +CME ERROR: <err>
•OK
•ERROR
<wAiur> Description
0 TA/ME shall calculate a proper number of receive
timeslots from currently selected fixed network user rate
(<speed> parameter from +CBST command, and
<codings>, and <wRx> (or <maxRx> from +CHSD
command if <wRx>=0)
1 Wanted air interface user rate is 9.6kbit/s
2 Wanted air interface user rate is 14.4kbit/s
3 Wanted air interface user rate is 19.2kbit/s
4 Wanted air interface user rate is 28.8kbit/s