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:
Mar. 20, 2001
Filed:
Dec. 27, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
A uni-direction protection switched ring node which switches from a working path to a protection path or vice versa includes a failure-information detect circuit which detects a failure occurring on the working path and a failure occurring on the protection path independently of each other as failure information. A failure-information-path identifying circuit determines whether a working path with a failure occurring thereon is an active or standby path or determines whether a protection path with a failure occurring thereon is an active or standby path. A select circuit selects either the working or protection path as an active path in accordance with results of detection and determination by the failure-information detect circuit and the failure-information-path identifying circuit respectively.