Network, Networking Technology, Data Communication Terms, Glossary and Dictionary

CD: Carrier Detect

Carrier Detect (CD) refers to a signal generated by modems when two modems decide that they can talk to each other. Carrier Detect indicates whether an interface is active and a call has been connected. CD remains present as long as the two modems are connected, though it can be interrupted by a call-waiting signal if one of the phone lines receives a second call.

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CD: Carrier Detect