Toshiba Qosmio G40 User Manual page 236

Dial tone detect
Disabled: The modem dials a call regardless of whether it detects a dial
Enabled: The modem dials only upon detection of a dial tone, and
Busy tone detect
Disabled: The modem ignores any busy tones it receives.
Enabled: The modem monitors for busy tones.
Zn Recall stored profile
The modem performs a soft reset and restores (recalls) the configuration
profile according to the parameter supplied. If no parameter is specified,
zero is assumed. Either Z0 or Z1 restores the profile.
&Cn Data Carrier Detect (DCD) control
Data Carrier Detect is a signal from the modem to the computer indicating
that a carrier signal is being received from a remote modem. DCD normally
turns off when the modem no longer detects the carrier signal.
&Dn DTR control
This command interprets how the modem responds to the state of the DTR
signal and changes to the DTR signal.
User's Manual
tone.
disconnects the call if the dial tone is not detected within 10
seconds.
Result Codes:
n=0,1,2,3,4,5
OK
ERROR Otherwise
Result Codes:
n=0,1
OK
ERROR Otherwise
&C0 The state of the carrier from the remote modem is ignored.
DCD circuit is always on.
&C1 DCD turns on when the remote modem's carrier signal is
detected, and off when the carrier signal is not detected
(default).
Result Codes:
n=0,1
OK
ERROR Otherwise
&D0 Ignore. The modem ignores the true status of DTR and treats
it as always on. This should only be used if your
communication software does not provide DTR to the
modem
&D1 If the DTR signal is not detected while in on-line data mode,
the modem enters command mode, issues an OK result
code, and remains connected.
AT Commands
C-6