Windows Marketplace V.90 - Manual (Page 36)

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&Bn V.32 Auto Retrain
This modem always auto retrains.
&B0: Disable V.32 auto retrain. ( NOT SUPPORTED)
&B1: Enable V.32 auto retrain (default).
Result Codes:
OK n = 1
ERROR Otherwise
&Cn Data Carrier Detect (DCD) Control
Data Carrier Detect is a signal from the modem to your computer indicating that
the carrier signal is being received from a remote modem. DCD normally turns off
when the modem no longer detects the carrier signal.
&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:
OK n = 0, 1
ERROR Otherwise
&Dn DTR Control
This command interprets how the modem responds to the state of the DTR
signal and changes to the DTR signal.
&D0: Ignore. The modem ignores the true status of DTR and treats it as always
on. This should only be used if your computer 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 OK result code, and remains connected.
&D2: If the DTR signal is not detected while in on-line data mode, the modem
disconnects (default). If this signal is not present, the modem will not an-
swer or dial.