Method and apparatus for detecting a telephone CPE alerting signal
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United States of America Patent
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Jul 15, 1997
Grant Date -
N/A
app pub date -
Dec 13, 1994
filing date -
Dec 13, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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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