Rockwell RCV144ACx, Command Reference Manual, Page: 69 / 186

AT Command Reference Manual
1048 3-51
3.9.3 Commands Supported Only by AudioSpan
The following commands are applicable only for modems supporting AudioSpan mode. The command has no effect in DSVD
mode. Modems that supports DSVD but not AudioSpan will report ERROR in response to these commands.
-SQS= x, y - Select AudioSpan Modulation
x: Select modulation mode
0 = V.61
1 = ML144 (Default for RCV144)
2 = ML288 (Default for RCV288)
y: Enable/disable AudioSpan automatic modulation (automode) selection (V.61, ML144, ML288)
0 = Disable AudioSpan automodulation Host selects AudioSpan modulation specified by the x parameter.
If the selected modulation is not supported by the modem,
ERROR is reported and the x parameter is not changed. If the
remote modem does not support the selected modulation, the
modem disconnects.
1 = Enable AudioSpan automodulation The modem starts with the AudioSpan modulation specified by the
x parameter and falls back from ML288, to ML144, to V.61, or to
data mode (e.g., V.34 or v.32 bis) depending on the selected x
parameter, the remote modem capability, and line conditions.
(Default.)
Notes
1. The AT-SQS parameters should remain at default unless a particular modulation is preferred.
2. For identical data speed with audio using different modulations (e.g., ML144 vs. ML288), the audio quality at ML288 will
be superior. For example, a ML288/9600 will be audibly superior to a ML144/9600 connection.
Examples
1. AT -SQS=2,1 enables AudioSpan automodulation starting with ML288 modulation.
2. AT -SQS=2,0 disables AudioSpan automodulation and selects ML288 modulation.
3. AT -SQS=1,0 disables AudioSpan automodulation and selects ML144 modulation.
Reporting Selected Options
The modem reports the selected options in response to the following command:
-SQS?
The response is:
<x>, <y>
Example:
-SQS?
2,1
Reporting Supported Options
The modem reports the supported options in response to the following command:
-SQS=?
The response is:
(list of<x> values), (list of <y > values)
Example:
-SQS=?