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:
Jan. 07, 2025
Filed:
May. 11, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A relay device (bA) includes an optical signal return unit () and a detection unit (). When an optical signal input via one optical transmission line () of two optical transmission lines (and) with a double-ring configuration has not been detected for a predetermined time or longer, the detection unit () outputs a disconnection signal of the optical transmission line. The optical signal return unit () is configured to, only when there is an input of the disconnection signal, return to one of the optical transmission lines () only a clamp beam that has been sent from a representative node via the other optical transmission line () in the direction opposite to the optical signal input via the one of the optical transmission lines ().