Patent
1984-06-14
1986-01-28
Rubinson, Gene Z.
179 84R, 179 18HB, H04M 100, H04Q 500
Patent
active
045673306
ABSTRACT:
A party line interface for permitting connection of a standard two-wire telephone designed for non-party line use to a party line system which rings subscribers by party line ringing signals of different frequencies. The interface includes circuitry for generating a ring command signal in response to the receipt of a party line ringing signal of a specified single frequency chosen from the group of possible ringing frequencies of the party line. The party line ringing frequency to which the circuitry for generating the ring command signal responds is programmable to permit selection of the particular party line ringing frequency to which the ring command signal will be generated in response thereto. Circuitry is provided for producing a ringing signal of a standard frequency designed to ring a standard telephone in response to the ring command signal.
REFERENCES:
patent: 3626106 (1971-12-01), Greening et al.
patent: 3689705 (1972-09-01), Pinede et al.
patent: 4081609 (1978-03-01), Beene et al.
patent: 4282410 (1981-08-01), Gauthier et al.
patent: 4406004 (1983-09-01), Hall et al.
patent: 4477697 (1984-10-01), Judd et al.
patent: 4528424 (1985-07-01), Middleton et al.
Di Vito Elio
Harris Corporation
Rubinson Gene Z.
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