Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 207)

AN93
Rev. 1.3 207
AT+VSM=4 OK
Select G.711U
-law PCM, 8-bit, 64 kbps
format. The voice driver will need to track
the OGM format with the OGM PCM file.
AT+VTX CONNECT Trigger transmit operation.
<DLE><u>
TX Underrun. Appears at the start of +VTX
before transmit data are seen.
[Voice Stream]
Transmit OGM voice stream. During voice
stream capture, the user can adjust the UB8
value via the <DLE><u> and <DLE><d>
commands. The host voice driver will need
track the number of adjustments and update
the +VGT value for future use.
<DLE><ETX> OK
Terminate the transmit operation. The
modem will respond with OK to denote the
return to command mode.
AT:U199|A OK
Mute the microphone and speaker paths to
the codec.
AT:U72,0108 OK
Configure Si3000 Register 1:
Disable speaker driver
Enable line output driver
Disable telephone instrument driver
Disable MBIAS output
AT:U72,05D7 OK
Configure Si3000 Register 5:
20 dB Line In gain
Enable Line In
20 dB MIC input gain
Mute MIC input
Mute telephone instrument input
Enable IIR filter
AT:U72,065E OK
Configure Si3000 Register 6:
0 dB RX PGA gain
Enable Line Out
Disable telephone instrument output
AT:U72,075E OK
Configure Si3000 Register 7:
0 dB RX PGA gain
Enable SPKRL
Mute SPKRR
AT:U72,0900 OK
Configure Si3000 Register 9:
0 dB Line Out attenuation
0 dB Speaker output attenuation
AT:U199&FFF7 OK
Enable speaker for local ring tone/alert
tones.
Table 130. TAM Handset Review OGM (Continued)