Communication device

Details Communication device Communication device

1992-05-18

1995-06-13

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379355, 379353, 379387, 379280, 379281, H04M 100

Patent

active

054250960

ABSTRACT:
A circuit for generating dial pulses and a circuit for forming the direct current loop of a line have conventionally been made up of relays and a coil. In the present invention, these circuits are made up of components, such as capacitors and a semiconductor switching element, to render a network control unit smaller. A compensating circuit is provided for reducing the distortion (caused by the capacitor in the DC loop) of the waveforms of dial pulses and rise waveforms of a direct current when the direct current loop is formed.

REFERENCES:
patent: 4087649 (1978-05-01), Kerman et al.
patent: 4286120 (1981-08-01), Sublette
patent: 4564726 (1986-01-01), Ibata
patent: 5121425 (1992-06-01), Reichelt
patent: 5157720 (1992-10-01), Fox

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