si2439-a-gm Silicon Laboratories, si2439-a-gm Datasheet - Page 39

• Manufacturer Part Number: si2439-a-gm
• Description: V.92 And V.34 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

+VRX
+VSD = <sds>,
<sdi>
+VSM = n
+VSP
+VTD = n
Command
Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued)
Receive Voice Stream.
Enable DTE receive of voice stream. The DCE will return a CONNECT response followed by
the voice stream as defined by the +VSM command. The DTE can issue a <DLE><!> or
<DLE><ESC> sequence to terminate the receive stream. The DCE will return a
<DLE><ETX> followed by an OK response for <DLE><!> and <DLE><ESC> followed by an
OK response for <DLE><ESC>. The DCE can be configured to terminate the stream using
the DTE/DCE Inactivity Timer, which is configured using the +VIT command. The DTE will
need to process any <DLE> shielded events present in the data stream. Any <DLE><DLE>
sequences can be preserved to allow less overhead during playback of the stream with the
+VTX command.
Silence Detection.
<sds>
127
128
129
<sdi> sets the length of a time interval in 0.1 second units, which must contain no or little
activity, before the ISOmodem will report (QUIET) (<DLE><q>). Default is five seconds.
Voice Compression Method.
0 Signed PCM
1 Unsigned PCM
4 G.711 µ-Law
5 G.711 A-Law
129 ADPCM 2-bit (2 kB/s storage)
131 ADPCM 4-bit (4 kB/s storage)
Voice Speakerphone State
<mode> Description
0 Speakerphone AEC, AES and LEC disabled.
1 Speakerphone AEC, AES and LEC enabled.
The +VLS=13 command must be used in combination with this setting.
DTMF / Tone Duration
This command sets the default DTMF / tone generation duration in 10 ms units for the +VTS
command. Default time is 1 second (n = 100).
Handset FIR filter coefficients are selected.
Speakerphone FIR filter coefficients are selected.
silence].
Noise level sensitivity
Less aggressive [more sensitive, lower noise levels considered to be
silence].
Nominal level of sensitivity.
More aggressive [less sensitive, higher noise levels considered to be
Timer.
Rev. 1.0
Action
Si2494/39
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