Pulse circuit for two wire electronic PABX stations

Details Pulse circuit for two wire electronic PABX stations Pulse circuit for two wire electronic PABX stations

1978-09-26

1980-04-15

Konick, Bernard

179 16EA, 179 81R, H04Q 150

Patent

active

041985478

ABSTRACT:
A pulse shaping circuit, for use with two-wire telephone station sets, such as normally associated with electronic private automatic branch exchange systems. The function of the pulse circuit is to regenerate hook-switch and hold-button control signal pulses for transmission to the common switching equipment as finite loop current interruptions of predetermined pulse width. The circuit overcomes false signalling and signal recognition problems caused by loop-current transient interruptions, and by imprecise manual operation of the station hook-switch and hold-button by station users.

REFERENCES:
patent: 3676605 (1972-07-01), Johnson
patent: 3742151 (1973-06-01), Ruether
patent: 3748403 (1973-07-01), Schartmann et al.
patent: 3870831 (1975-03-01), McCarley
patent: 4001520 (1977-01-01), Waldman
patent: 4086440 (1978-04-01), Hurle

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