This parameter determines how the state of the DCD line relates to the detection of the received line
signal from the distant end. Changing the parameters will take effect immediately in both the command
and online command states.
The DCD line is an output line that indicates the following:
In Circuit Switch Data mode an active (low) indicates that a valid carrier (data signal) was detected by the
Module (CONNECT message is received), and inactive (high) indicates idle. The AT&C command always
puts the DCD command ON, when set to 0. If the AT&C command is set to 1 then the "+++" escape
command sets the DCD signal to an inactive state and the ATO command is set to active. The AT&C set
to 2 sets the DCD signal OFF.
In GPRS mode, the DCD line indicates the PDP context status. PDP context active sets the DCD to active
(low); PDP context inactive sets the DCD to inactive (high). The DCD is activated only when the PDP
context is achieved. The DCD is de-activated when the PDP context is off.
In Local Link mode, the DCD line indicates the Local Link data status.
When AT&C is set to 0, the DCD signal is always ON.
When AT&C is set to 1:
DCD signal is set to ON when +MDLC command has been launched.
DCD signal is set to OFF when Local link has been stopped. When AT&C is set to 2, the DCD signal is
always OFF.
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).
Note: If &C is set to 2 when a CSD call is set, DCD will always remain OFF.
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