AT Command Reference Manual
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1048
Notes
AudioSpan audio quality is dependent upon modulation mode, data rate and telephone line quality. Some guidelines are:
1. Higher quality telephone lines provide better audio quality than impaired telephone lines.
2. A lower data speed with audio provides better audio quality than higher data speed with audio. For example, a
ML288/9600 connection will be audibly superior to a ML288/14400 connection.
3. 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 -SMS=2 selects AudioSpan Mode (the y, z, and t parameters are not required).
2. AT -SMS=2,4800,9600 selects AudioSpan Mode, specifies the minimum data speed with audio of 4800 bps, and
specifies the maximum data speed with audio of 9600 bps.
Reporting Selected Options
The modem reports the selected options in response to the following command:
-SMS?
The response is:
<x>, <y> <z>,< t>
Example:
-SMS?
2,1
Reporting Supported Options
The modem reports the supported options in response to the following command:
-SMS=?
The response is:
(list of<x> values),(list of <y > values),(list of <z > values),(list of <t > values)
Example:
-SMS=?
(0,1,2,3),(4800-14400),(4800-14400),(0,1,2,3,4,5,6)
#VLS = x - Voice Line Select
0 =
Telephone handset
(Default)
5 =
Headset
6 =
Speakerphone
The AT#VLS setting must be issued prior to establishing a DSVD or AudioSpan connection if a voice line other than the
default telephone handset is desired.
3.9.2 Commands Supported Only by DSVD
-SSE= x - Enable/Disable DSVD
0 =
Disable DSVD
(Default)
1 =
Enable DSVD
(A modem not supporting DSVD will respond with ERROR)
Note: DSVD mode can be enabled by either AT-SSE=1 or AT-SMS=1, and disabled by either AT-SSE=0 or AT-SMS=0.
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