1982-05-17
1984-09-25
Brown, Thomas W.
H04M 322
Patent
active
044737190
ABSTRACT:
The subject switchhook status detector is part of a battery feed circuit and functions to sense the magnitude of the current flowing on both the tip and ring conductors. The detector also generates a sum signal which represents the total metallic current flowing in the loop. The subject detector maintains the battery feed circuit in the off state until the sum signal exceeds a first predetermined threshold and, concurrently, both the tip and ring currents individually exceed another predetermined threshold. This combination of requirements prevents the generation of erroneous off-hook indications.
REFERENCES:
patent: 3651271 (1972-03-01), Knauer
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patent: 4087646 (1978-05-01), Brolin et al.
patent: 4115664 (1978-09-01), Laface et al.
patent: 4164713 (1979-08-01), Brolin et al.
patent: 4287392 (1981-09-01), Melindo
patent: 4385336 (1983-05-01), Takeshita et al.
patent: 4406929 (1983-09-01), Pace et al.
Embree Milton L.
Knollman Dieter J. H.
Martin Earl O.
AT&T Bell Laboratories
Brown Thomas W.
Graziano James M.
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