Solid state ringing switch

Telephonic communications – Centralized switching system – With generating of call associated substation signal

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Solid state ringing switch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid state ringing switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state ringing switch will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-447172

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.