Chapter 3: AT Commands Reference
April 15, 2008 G24-L AT Commands Reference Manual 3-137
When AT&C is set to 0, the DCD signal is always ON. When AT&C is set to 1, the DCD is
activated in online mode. When AT&C is set to 2, the DCD is activated only when the PDP
context is achieved (temporary IP address is received).
The following table shows the &C parameters.
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
Command Type Syntax Response/Action
Set
AT&C<param> OK
Read
Test
AT&C=?
&C:(list of supported <param>s)
Table 3-88: &C Parameters
<Parameter> Description
<param> DCD signal ON
0 DCD is forced ON at all times.
1 DCD is set to ON when:
a A CSD carrier is detected.
b A GPRS external session is being
established:
G24-L enters PPP mode
TE is about to send an LCP configure-request to the G24-L (GPRS connection is not
yet established).
DCD is set to OFF when:
a No CSD carrier is detected. This can
happen when a CSD call has been disconnected
or when G24-L enters CSD online command mode
(switch operation).
b The G24-L has lost its GPRS connection with the
network (PDP context was deactivated and the IP
address is cancelled).
2 DCD is set to ON when G24-L 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 G24-L has lost its GPRS connection with the network
(PDP context was deactivated and the IP address is cancelled).
The default value is 1.
