Paradyne 3800 - Manual (Page 49)

COMSPHERE 3800 Series Modems – Model 3830
4-14 November 1996 3830-A2-GB91-20
Table 4-2
(8 of 22)
Model 3830 AT Commands
&C n

LSD Control
Line Signal Detect (LSD) is a signal indicating that the carrier signal is
being received from the remote modem. It is normally turned Off to the
DTE when the power level of the received carrier signal drops below the
carrier detect threshold.
&C0 Forced On. LSD ON at all times.
&C1 Standard RS232. LSD is ON when the remote modem’s carrier
signal is detected. LSD is Off when carrier signal is not detected.
&C2 Wink When Disconnect. LSD normally forced ON, turns Off for
approximately one second upon disconnecting.
&C3 Follows DTR. State of LSD follows state of DTR.
&C4 Simulated Control Carrier. State of LSD follows state of remote
modem’s RTS via V.13 simulated control carrier signaling. Note that the
remote modem’s RTS Action configuration option must be set to
Simulated Control Carrier.
&C5 DTR/Disconnect Off. State of LSD follows state of DTR except upon
a disconnect where LSD always turns Off. DTR must then toggle Off and
ON to turn LSD ON. Use this setting for AT&T DATAKIT applications.
Note that to use this configuration option, the DTR Action configuration
option must be set to Stndrd_RS232 (&D1 or &D2).
&C6 Bridge Retrain. LSD behaves as if it were set for Standard RS232,
except that it is turned Off when a retrain condition lasts longer than 10
seconds, and turned ON when no retrain condition is detected for 10
seconds.