Telephonic communications – Reception of calling information at substation in wireline... – Blocking caller id transmission
Patent
1994-12-13
1997-07-15
Chin, Wellington
Telephonic communications
Reception of calling information at substation in wireline...
Blocking caller id transmission
379215, 379351, H04M 342, H04M 156
Patent
active
056490020
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.
REFERENCES:
patent: 4191862 (1980-03-01), Hughes
patent: 5189634 (1993-02-01), Eberle et al.
patent: 5228080 (1993-07-01), Nutter et al.
patent: 5263084 (1993-11-01), Chaput et al.
"Test Guidelines for Analog Type 1, 2 and 3 CPE as Described in SR-INS-002726", Bellcore (Bell Communications Research) Special Report SR-NWT-003004, Issue 1, Feb. 1994.
Brady Robert H.
Marra Alexander J.
Nutter William L.
Zielski David
Chin Wellington
Colonial Data Technologies Corp.
Loomis Pal
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