The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 1987
Filed:
Oct. 02, 1985
Charles D Gavrilovich, Naperville, IL (US);
American Telephone and Telegraph Company, AT&T Bell Laboratories, Murray Hill, NJ (US);
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.