In Open AT what does DCD indicate?



I am using the Wavecom Fasttrack modem with WIPSoft 3.21. I need to know whether the DCD signal can be used as an indication of connectedness of the IP (ie is the remote server still connected) as per a normal PSTN or GSM modems. Is this a standard feature or would I need to write code in the modem?

Any help you can provide is greatly appreciated!