Pulse output telephone system with ring tap elimination

Details Pulse output telephone system with ring tap elimination Pulse output telephone system with ring tap elimination

1983-09-26

1985-07-16

Rubinson, Gene Z.

179 84R, H04M 174

Patent

active

045298440

ABSTRACT:
Telephone station apparatus having ring tap elimination circuitry is provided. The ringers of secondary or extension telephones connected to the same telephone line as a first telephone, the first telephone being in an off-hook position and being dialed, are bypassed during dialing of the first phone, to prevent ring tap. The output of a bridge circuit provides the threshold switching signal for a pair of switching transistors, effectively limited by a zener diode and resistor combination. The lower voltage and/or frequency of the dial output pulses effectively signals the switching transistor combination to allow the signal to bypass the ringer of parallel connected extension telephones. Alternatively, the same circuitry allows signal flow through the ringer during transmission of a higher voltage and/or frequency signal, produced in response to an incoming call being present on the telephone line.

REFERENCES:
patent: 4152549 (1979-05-01), Ceruti et al.
patent: 4213012 (1980-07-01), Carroll et al.

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