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. 08, 2016
Filed:
Jan. 22, 2014
Hitachi Metals, Ltd., Tokyo, JP;
Chikara Sawaguchi, Tsukuba, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
In a chassis-type network relay device, fault tolerance for the continuity monitoring function of Ethernet (Registered Trademark) OAM is improved. A first management card and a second management card serving as a main management card and a backup management card have continuity monitoring units which generate monitoring frames for checking continuity between devices and transmit the monitoring frames to a given line card, respectively. Each of a plurality of line cards has a transmission source selecting unit which, when having received respective monitoring frames from both management cards, selects one of the monitoring frames and transmits the selected monitoring frame from a given port.