Telephone ring detection method and apparatus

Details Telephone ring detection method and apparatus Telephone ring detection method and apparatus

1992-01-15

1994-07-26

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379180, 379164, H04M 100

Patent

active

053331907

ABSTRACT:
A ring detection device adapted to be connected in a telephone line to a telephone or telephone device. The device includes circuitry for distinguishing between several differently encoded telephone ring signals and enabling and/or maintaining disablement of the telephone or telephone device to which it is connected based upon such distinction. The device includes a switch for selecting which of the incoming telephone ring signals the telephone or telephone device to which is it connected is enabled.

REFERENCES:
patent: 4146754 (1979-03-01), Rose
patent: 4701949 (1987-10-01), Lynch et al.
patent: 4720853 (1988-01-01), Szlam
patent: 4723271 (1988-02-01), Grundtisch
patent: 4959853 (1990-09-01), Del Monte et al.
patent: 4998273 (1991-03-01), Nichols
patent: 5062133 (1991-10-01), Melrose

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