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6-14 PRO/100 LAN+Modem PC Card User’s Guide
&B0 Disables the V.32 automatic retrain capability (not
supported).
&B1 Enables the V.32 automatic retrain capability (sup-
ported for backward compatibility only).
&Cn Data Carrier Detect (DCD)
The AT&Cn command, where n represents 0 or 1, selects the method by
which the modem handles the carrier detect signal.
&C0 The carrier detect signal is forced on regardless of the
condition of the distant modems carrier.
&C1 The state of the carrier from the remote modem is
monitored. The local modems DCD signal is on when
the remote modems carrier signal is detected, and off
when it is not (default).
&Dn Data Terminal Ready (DTR) Options
The AT&Dn command, where n represents 0-3, controls how the Data
Terminal Ready (DTR) signal is used by the modem.
&D0 Ignore the DTR signal from the computer and treat it
as always on.
&D1 Monitor DTR and, when an ON-to-OFF transition of
the DTR signal occurs, switch to command mode, issue
an OK result code, and remain connected.
&D2 Monitor DTR and, when an ON-to-OFF transition of
the DTR signal occurs, hang up the line and switch to
command mode.
&D3 Monitor DTR and, when an ON-to-OFF transition of
the DTR signal occurs, hang up, reset the modem and
switch to the initialization state.