Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 74)

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74 Rev. 1.3
+VGT
Transmit Gain Selection.
The parameter has a range of 112-134 with 128 being the
nominal value. This represents a range of -48 to 18 dB. The default
is 128 (0 dB). This command is used to control the transmit gain at
the DTE to either the Si3000 Codec or the DAA. The purpose is to
adjust the DTE transmit gain for the TAM voice stream during idle
state.
+VIP Load Voice Factory Defaults.
+VIT
DTE/DCE Inactivity Timer.
The parameter has a range of 0–255 with units of sec-
onds.
The default is 0 (disable).
+VLS = n Analog Source / Destination Select.
n Description
0
ISOmodem on-hook. AOUT disabled. Tone detec-
tors disabled. Si3000 sample pass-through to
DAA is inactive.
1 ISOmodem off-hook. AOUT disabled. Tone detectors
disabled.
4
ISOmodem on-hook. AOUT connected to ISOmo-
dem tone generators. Tone detectors disabled.
5 ISOmodem off-hook. AOUT connected to PSTN.
Tone detectors enabled.
15
ISOmodem goes off-hook, begins V.253 tone event
reporting and Si3000 to DAA sample pass-through
becomes active. Dial tone can be heard on handset.
20 ISOmodem on-hook. AOUT disabled. Tone detectors
enabled.
21
ISOmodem on-hook. AOUT connected to ISOmo-
dem tone generators. Tone detectors enabled.
+VNH = > Automatic Hangup Control.
Hook control description
0 The ISOmodem retains automatic hangups as
is normal in the other modes (such as hanging
up the phone when the ISOmodem does not
detect a data carrier with a given time interval).
1 The ISOmodem shall disable automatic hangups
in the other non-voice modes.
2 The ISOmodem shall disable all hang-ups in other
non-voice modes. The ISOmodem shall only per-
form a “logical” hangup (return the OK result
code).
Table 39. Basic AT Command Set (Continued)
Command Action