Solid state ringing switch

Details Solid state ringing switch Solid state ringing switch

1990-03-16

1990-09-04

Dwyer, James L.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379255, 328179, 328 21, 307269, H04M 302

Patent

active

049550535

ABSTRACT:
A ringing switch for providing ringing voltage and tripping voltage to the cable pairs of a telephone central office. The switch synchronizes the control signal from a cadence generator with the zero crossing of the ringing voltage to ensure that the voltage at the switch output changes from the ringing voltage to the tripping voltage or vice versa only when the ringing voltage crosses the tripping voltage. Field effect transistors are used to switch the ringing voltage and a silicon controlled rectifier is used to switch the tripping voltage.

REFERENCES:
patent: 3683118 (1972-08-01), Vago et al.
patent: 4370526 (1983-01-01), Schoofs et al.
patent: 4656659 (1987-04-01), Chea, Jr.
patent: 4797917 (1989-01-01), Pusetti et al.

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