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:
Jul. 02, 1996
Filed:
Sep. 08, 1994
Katsuyuki Tada, Kawasaki, JP;
Katsuya Kitamori, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An optical transmission system includes a plurality of nodes connected via optical transmission lines in a ring form. When an optical transmission line is disconnected or a fault is found on the optical transmission device of a node, a transmission line is switched over to another transmission line by a line switching system which includes optical transmission lines of a working line for transmitting optical data signals and a protection line for transmitting APS (Automatic Protection Switch) bytes. Each of the nodes has a comparing and detecting unit for receiving the APS bytes sent from an adjacent node and comparing a fault pattern indicated by the APS bytes with a fault pattern stored in advance, and a processing unit which determines a line switching route, based on the result of comparison in the comparing and detecting unit.