Method and apparatus for detecting a telephone cpe alerting...

Details Method and apparatus for detecting a telephone cpe alerting... Method and apparatus for detecting a telephone cpe alerting...

H - Electricity

04

M

H04M 3/04 (2006.01) H04M 1/57 (2006.01) H04M 3/428 (2006.01) H04M 19/04 (2006.01)

Patent

CA 2163570

A method and apparatus for verifying that a CAS (Customer Premises Equipment Alerting Signal) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid detect signal, includes structure and process steps for suppressing a signal originating at a local telephone in response to the CAS detect signal. A determination is made whether the CAS detect signal remains in a predetermined condition at a predetermined time after the local telephone signal is suppressed. A validity signal is output when the CAS detect signal remains in the predetermined condition at the predetermined time. False detections are thereby minimized by ignoring detections caused by a signal originating at the local telephone.

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