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:
Jun. 01, 1982
Filed:
Dec. 02, 1980
Jeffrey G Farrington, Bishop's Stortford, GB;
International Standard Electric Corporation, New York, NY (US);
Abstract
In a repeater for use in an optical fiber data transmission system of the closed-loop type, the input and output transducers each have a component which, depending on its biasing conditions, can act as a photo-detector or as a light-emitter. One such device is a light-emitting diode, which if reverse-biased acts as a photo-detector. With suitable switching this enables the realization of a reversible repeater. During normal operation, the direction of transmission is reversed at the end of each message received by a remote terminal, a reply message being sent during this period of reversal, after which the remote terminal reverts to normal operation. In the event of an interruption in message reception as detected at a remote terminal, the reversal of transmission direction also occurs, so that a line break in effect converts the system to two 'one-way' systems.