Variable delay ringing detector

Details Variable delay ringing detector Variable delay ringing detector

1977-06-06

1978-07-25

Olms, Douglas W.

179 6E, 179 2A, H04M 100

Patent

active

041031148

ABSTRACT:
A variable delay ringing detector in a single channel carrier system for telephone service is disclosed including at the remote terminal a battery charger for charging a battery which powers the carrier electronics at the remote terminal. A ringing generator and supervisory circuits are disclosed to provide normal telephone supervision on the carrier-derived channel. The variable delay ringing detector includes two capacitors which are charged in response to ringing current.

REFERENCES:
patent: 3510584 (1970-05-01), Krasin et al.
patent: 3701937 (1972-10-01), Combs
patent: 3723656 (1973-03-01), Curtis et al.
patent: 3771039 (1973-11-01), Stewart
patent: 3811012 (1974-05-01), Barber
patent: 3842209 (1974-10-01), Foresta et al.

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