Telephone ringing generators

Details Telephone ringing generators Telephone ringing generators

1975-12-05

1977-03-29

Cooper, William C.

179 25R, H04M 126

Patent

active

040150917

ABSTRACT:
A single channel carrier system for telephone service is disclosed including a remote terminal having a battery charger for charging a battery during idle periods to power the remote carrier electronics. The remote electronics include a ringing generator and supervisory circuits to implement normal telephone supervision over the carrier channel.
The ringing generator is a DC-to-DC converter for stepping the battery voltage up to ringing voltage level. This high unipolar ringing voltage is then interrupted at a 20 Hz rate during the ringing portion of the ringing cycle. Simple diodes serve to isolate the unipolar ringing signals from other portions of the circuit.

REFERENCES:
patent: 3459895 (1969-08-01), Ebhardt
patent: 3471650 (1969-10-01), Birck
patent: 3475561 (1969-10-01), Krasin
patent: 3536852 (1970-10-01), Dolarmore
patent: 3780228 (1973-12-01), Stewart
patent: 3904833 (1975-09-01), Beene
patent: 3927266 (1975-12-01), Stewart et al.
patent: 3934089 (1976-01-01), Stewart

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