Command Reference Manual
1199
6-15
6.2.2.12 +VSM - Compression Method Selection
This command causes the modem to set the voice compression method, the silence compression sensitivity, and the voice
sampling rate.
Syntax
+VSM=<cml>,<vsr>,<sds>,<sel>
Defined Values
<cml>
Decimal number identifying the compression method.
<vsr>
<range of values> containing the supported range of voice samples per second of the analog
signal.
<scs>
<range of values> containing the supported range of sensitivity settings for voice receives.
<sel>
<range of values> containing the supported range of expansion values for voice transmits.
Reporting Current or Selected Values
Command:
+VSM?
Response:
<cml>,<vsr>,<sds>,<sel>
Example:
1,7200,0,0
Default
Reporting Supported Range of Parameter Values
Command:
+VSM=?
Response:
<cml>,<cmid>,<bps>,<tm>,<vsr>,<sds>,<sel>
<cml>
Decimal number identifying the compression method (1, 129, 130, 140, or 141).
<cmid>
Alphanumeric string describing the compression method (UNSIGNED PCM, IMA ADPCM,
UNSIGNED PCM, 2 Bit ADPCM, or 4 Bit ADPCM).
<bps>
Decimal number defining the average number of bits in the compressed sample not including
silence compression (2, 4 or 8).
<tm>
Decimal number (0) reporting the time interval, in units of 0.1 second, between timing marks. A
value of 0 reports that timing marks are not supported.
<vsr>
<range of values> containing the supported range of voice samples per second of the analog
signal (7200, 8000, or 11025). Note: At 11025, concurrent tone detection is not supported.
<scs>
<range of values> containing the supported range of sensitivity settings for voice receives (0). A 0
indicates not supported.
<sel>
<range of values> containing the supported range of expansion values for voice transmits (0). A 0
indicates not supported.
Example:
1,"UNSIGNED PCM",8,0,(7200,8000,11025),0,0
129,"IMA ADPCM",4,0,(7200,8000),0,0
130,"UNSIGNED PCM",8,0,(7200,8000,11025),0,0
140,"2 Bit ADPCM",2,0,(7200,8000,11025),0,0
141,"4 Bit ADPCM",4,0,(7200,8000,11025),0,0
OK
Result Codes
OK
Valid range.
ERROR
Otherwise. or if not in Voice Mode.
Summary of Contents for RC336D
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