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:
Feb. 15, 2000
Filed:
Jul. 16, 1997
NEC Corporation, Tokyo, JP;
Abstract
An optical transmitter/receiver transmits and receives optical signals between terminal devices of a network which are connected by a twisted pair cable with a feeder line. The optical transmitter/receiver has an electric connector for connection to the twisted pair cable, a peak holding circuit for detecting whether there is an optical signal in an optical fiber based on an output signal from an optical receiver, and a biasing circuit for applying a bias voltage to the twisted pair cable. The biasing circuit applies a bias voltage to a twisted pair of the twisted pair cable if there is an optical signal in the optical fiber, and stops the application of the bias voltage to the twisted pair if there is no optical signal in the optical fiber. The terminal devices are capable of detecting insertion or removal of the twisted pair cable or the optical fiber.