Telephone system with a ground or wire return

Details Telephone system with a ground or wire return Telephone system with a ground or wire return

1980-09-23

1983-08-02

Popek, Joseph A.

179 16D, H04B 344

Patent

active

043968082

ABSTRACT:
A telephone system is described that includes a long line with a plurality of electrical conducting wires from a central office to at least one repeater and to at least one substation. Carrier frequency alternating signals are sent over a balanced pair of wires in the plurality between a first terminal at the central office and a second terminal at the substation. The repeater repeats and amplifies the carrier frequencies. A D.C. power source and/or an audio frequency source at the central office is connected to the plurality via a first line balancing network. The substation receives D.C. current and/or audio frequency current from the plurality via a second line balancing network. The repeater has a third and fourth line balancing network for receiving and bypassing D.C. current and/or audio frequency current in the plurality. The return path for the D.C. source and/or audio frequency source is an electrical conducting return medium which does not use the pair of wires. One such return medium is earth ground. Use of the return medium greatly increases the length of the long line.

REFERENCES:
patent: 2594019 (1952-04-01), Holman
patent: 4178484 (1979-12-01), Vincent

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