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:
Nov. 04, 2025
Filed:
Aug. 30, 2023
Nec Corporation, Tokyo, JP;
Kazuki Matsumoto, Kanagawa, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A communication system includes a first communication apparatus and at least one second communication apparatus connected in series through an optical communication cable. Each of second communication apparatuses calculate an index value indicating the quality of a transmission signal received from a communication apparatus disposed adjacent to and upstream of the apparatus itself. When the second communication apparatus receives restoration information indicating that the communication apparatuses disposed upstream of the apparatus itself has been restored from a failure of an input signal, it determines whether or not the calculated index value is within a predetermined range. When it is determined that the index value is not within the predetermined range, a respective optical module provided in the second communication apparatus executes a reset process, wherein the respective optical module is configured to receive a transmission signal.