AT Commands Reference Manual - wireless netcontrol GmbH

Hardware Information
The following table shows the &C parameters.
Table 3-98: &C Parameters
DCD signal ON
0 DCD is forced ON at all times.
1 DCD is set to ON when:
a
b
Description
A CSD carrier is detected.
A GPRS external session is being
established:
H24 enters PPP mode
TE is about to send an LCP configure-request to the H24 (GPRS
connection is not yet established).
c Local link starts (+MDLC command launched).
DCD is set to OFF when:
a No CSD carrier is detected. This can
happen when a CSD call has been disconnected
or when H24 enters CSD online command mode
(switch operation).
b
The H24 has lost its GPRS connection with the
network (PDP context was deactivated and the IP
address is cancelled).
c Local link has been stopped.
2 DCD is set to ON when H24 establishes a GPRS connection with the network
(PDP context is activated and the IP address is received from the network).
DCD is set to OFF when H24 has lost its GPRS connection with the network
(PDP context was deactivated and the IP address is cancelled).
The default value is 1.
Note: If &C is set to 2 when a CSD call is set, DCD will always remain OFF.
Example
AT&C?
&C: 1
OK
AT&C0
OK
3-162 H24 - AT Commands Reference Manual April 15, 2010