Permanent signal holding module

Details Permanent signal holding module Permanent signal holding module

1980-08-18

1982-11-09

Brown, Thomas W.

1791752R, H04M 314, H04M 322

Patent

active

043586392

ABSTRACT:
A manually assisted lockout relay circuit is used in a telephone switching facility to disconnect and isolate an offending subscriber's telephone line to prevent it from capturing and holding central exchange equipments that are commonly accessible and needed by a plurality of other subscribers. A central office technician, through use of the master test frame, determines that the offending subscriber has removed the telephone handset from its hook or cradle and has not made an attempt to complete a call. An offending subscriber, for whatever reason, persists for long periods of time, and on repeated occasions, in leaving his handset off hook. In such instances the technician energizes the lockout relay, by application of central office high voltage, to isolate the offending subscriber's line from the system. Replacement of the handset by the offending subscriber resets the circuit for normal operation. Inadvertent lockout in normal operation is prevented by a zener diode in series with the lockout relay. The lockout circuit is in modular form with plug-in and wired connections. A specific design has been made for use with the popular #5 crossbar exchange offices.

REFERENCES:
patent: 2525840 (1950-10-01), Sterrett et al.
patent: 2650950 (1953-09-01), Kessler
patent: 3156777 (1964-11-01), Horwitz et al.
patent: 3378642 (1968-08-01), Gagnier et al.
patent: 3699265 (1972-10-01), Altenburger
patent: 3705959 (1972-12-01), Swanson
patent: 3875342 (1975-04-01), Stern
patent: 3875351 (1975-04-01), Kennedy
patent: 3883698 (1975-05-01), Catterall

Affiliated with

Also associated with

Rating

Permanent signal holding module does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Permanent signal holding module, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Permanent signal holding module will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-747255