Call detection control apparatus

Details Call detection control apparatus Call detection control apparatus

1993-06-04

1995-05-16

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

Time out

379164, 379165, 379156, 379162, 379323, 379324, H04M 322

Patent

active

054168325

ABSTRACT:
A call detection control apparatus includes individual call detecting circuits, a common call detecting circuit, switching circuits, and a power supply circuit. The individual call detecting circuits individually detect call signals, which originate from telephone subscriber lines. The common call detecting circuit commonly detects call signals, which originate from the respective telephone subscriber lines. The switching circuits switch the respective telephone subscriber lines from the common call detecting circuit to the respective individual call detecting circuit when the common call detecting circuit detects an call signal from one of the respective telephone subscriber lines. The power supply circuit supplies operating power to each of the individual call detecting circuits upon interlocking with an operation of a corresponding one of the switching circuits.

REFERENCES:
patent: 3968327 (1976-07-01), Gregg, III
patent: 4809318 (1989-02-01), Schoute
patent: 4908856 (1990-03-01), Poletto
patent: 5283825 (1994-02-01), Conforti et al.

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