User's Manual

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 modems carrier.
&C1 The state of the carrier from the remote modem is
monitored. The local modems DCD signal is on when
the remote modems 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.