AT Commands Phone Terminal Terminated 43
AT+CHSN HSCSD Non-transparent Call Configuration
<codings>:
<codings> Description
4 Indicates that the accepted channel coding for the next
established non-transparent HSCSD call is 9600 bits/s only
8 Indicates that the accepted channel coding for the next
established non-transparent HSCSD call is 14000 bits/s
only
12 Indicates that the accepted channel coding for the next
established non-transparent HSCSD call is both 9600
bits/s and 14000 bits/s
Default setting
Description: Set HSCSD configuration. This command is also used during a call if a new <wAiur>
and/or <wRx> are/is desired.
Set command: AT+CHSN=[<wAiur>[,<wRx>[,<topRx>[,<codings>]]]]
Read command: AT+CHSN? Displays the current <wAiur>, <wRx>, <topRx>, and <codings>
settings.
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 the currently selected fixed-network user rate
See note below
Default setting
1 Desired air-interface user rate is 9600 bits/s
2 Desired air-interface user rate is 14400 bits/s
3 Desired air-interface user rate is 19200 bits/s
4 Desired air-interface user rate is 28800 bits/s
<wRx>:
<wRx> Description
0 TA/ME calculates a proper number of receive time slots
from currently selected <wAiur> and <codings>
See note below
1 Desired number of time slots is 1
Default setting
2 Desired number of time slots is 2
Note: If the <wAiur> and <wRx> are both set to ‘0’, the number of receive time slots
is calculated from <speed> and <codings>. Furthermore, if <speed> is ‘0’, the number
of receive time slots is mapped from <maxRx>.
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