Discriminating network for telephone switching signals

Details Discriminating network for telephone switching signals Discriminating network for telephone switching signals

1977-04-05

1978-09-19

Claffy, Kathleen H.

179 18HB, H04M 302

Patent

active

041156641

ABSTRACT:
A network discriminating among switching signals appearing on a pair of talking wires of a telephone line comprises a light-emitting diode in series with each wire and a phototransistor illuminable thereby. The phototransistors energize respective amplifiers which work into a logic circuit distinguishing between current flow in one or both of these wires.

REFERENCES:
patent: 3757052 (1973-09-01), Tothill
patent: 3829619 (1974-08-01), Close
patent: 3838223 (1974-09-01), Lee
patent: 3941939 (1976-03-01), Holmes

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