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CD carrier detect When two modems decide that they can talk to each other, they generate a signal on the serial RS-232 interface called carrier detect. 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. Sometimes this interruption is enough to drop the data connection and let the phone ring. Some regard this as a bug, others as a nice feature. It depends on the importance of the incoming call. |