Power transmission arrangement for telecommunications systems

Details Power transmission arrangement for telecommunications systems Power transmission arrangement for telecommunications systems

1985-10-02

1987-08-04

Rubinson, Gene Z.

Telephonic communications

Centralized switching system

Power supply

379413, H04M 1906

Patent

active

046851291

ABSTRACT:
An arrangement for supplying electrical power from a telecommunication central office to a remote network termination employs the wires of a two-wire digital subscriber loop in parallel using earth ground as a return path. At the central office, two power supplies separately provide power to the two wires of the loop in parallel and the current supplied by the two power supplies is added at the remote interface by means of a center-tapped transformer coil which is part of the transformer used for the transmission of digitally encoded voice and data signals. A DC-to-DC converter connected to the center tap provides the required power to the interface circuitry. The DC-to-DC converter is grounded to earth ground through a low-pass filter which is designed to block higher frequency noise signals.

REFERENCES:
patent: 4203011 (1980-05-01), Coviello
patent: 4425512 (1984-01-01), Tomooka et al.
patent: 4564726 (1986-01-01), Ibata
"Electronic Contacts in Telephone Exchanges: Contact Opening and Closing Phenomena and Quenching Techniques", W. L. Scott, Post Office Electrical Engineering Journal, vol. 63, Pr. 3, Oct. 1970, pp. 179-188.
"Transmission Codes" Digital Transmission Systems, 1979, pp. 239-245.
Telecommunications Transmission Engineering, vol. 1--Principles, Second edition, 1977, p. 342.

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