Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 194)

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194 Rev. 1.3
7.4. Initialization
The following sequence is used after power up or hardware reset to prepare the modem for voice operations. This
procedure occurs in the Initialize state presented in Figure 31. After initialization, the system will be in the TAM
Hands-Free mode, which is discussed in "7.3.3.1. TAM Hands-Free".
Table 119. Initialization Sequence
Host to Modem Commands
Modem to
Host Result
Codes
Local Modem Actions
ATZ OK
Reset. The Si3000 is not reset by this
command.
ATE0+FCLASS = 0 OK
Disable local AT command echo and
enter data mode, which is necessary for
patch loading.
AT+IPR = 115200 OK
Disable autobaud and set rate to
115,200 bps.
[ Apply Patch Commands ] OK Apply the modem patch commands.
AT:U199|A OK
Mute the microphone and speaker
paths to the codec.
ATE0+FCLASS = 8 OK
Disable local AT command echo and
enter voice mode. Limited V.253 event
reporting enabled with default setting of
+VLS=0.
AT+VLS = 0 OK
Disable voice mode. Used as a transi-
tion point between non-zero +VLS voice
modes.
AT+VLS = 14 OK
Setup on-hook TAM voice mode. See
Table 117 on page 190 for details.
AT*Y254:W59|1 OK Enable the SSI interface to the Si3000.
AT*Y0 OK Exit the AT*Y command mode.
AT+VCDT = 1 OK Enable always-on Type I Caller ID.
AT+VCID = 1 OK Enable formatted Caller ID.
AT+VSD = 129 OK Set silence detection sensitivity level.
AT+PCW = 0 OK Enable Type II Caller ID reporting.
AT:U0B1,0500 OK Set Si3000-to-DAA transmit gain.
AT:U0B5,0200 OK Set DAA-to-Si3000 receive gain.
AT:U0B6,0100 OK Set Sidetone gain.
AT:U0B9,0300 OK Set VTS-to-Si3000 transmit gain.
AT:U0B4,0600 OK Set VTS-to-DAA transmit gain.