Dual mode telephone subscriber loop current detector

Details Dual mode telephone subscriber loop current detector Dual mode telephone subscriber loop current detector

1977-01-28

1978-05-02

Robinson, Thomas A.

179 84R, 179 18HB, H04Q 900, H04M 300

Patent

active

040876462

ABSTRACT:
A detector circuit is shown for detecting off-hook and dial pulse signals in a telephone system which, under the control of a ringing relay, reconfigures itself to provide ring-trip detection. The detection circuit includes a bridge which is responsive to circulating loop currents, while at the same time unresponsive to longitudinally balanced currents, and a two-stage voltage level detector circuit. An RC timing circuit is included between the two stages to insure that the detector is unresponsive to short duration pulses and, at the same time, once energized, will bridge over short duration interruptions of detected pulses.

REFERENCES:
patent: 3205312 (1965-09-01), Brightman et al.
patent: 3899644 (1975-08-01), Hunt
patent: 3935392 (1976-01-01), Smith et al.

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