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. 07, 2023
Filed:
Jul. 12, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Masatoshi Namiki, Musashino, JP;
Masahiro Yokota, Musashino, JP;
Hiroki Kawahara, Musashino, JP;
Hiroto Takechi, Musashino, JP;
Katsuhiro Araya, Musashino, JP;
Masaaki Inami, Musashino, JP;
Daisaku Shimazaki, Musashino, JP;
Hideki Maeda, Musashino, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A monitoring control unit () of an OXC () stores a management table () in which pieces of information regarding a modulation mode, an FEC, and a frame mode of an optical signal are associated with each other, and sequentially changes the modulation mode, the FEC, and the frame mode according to the management table () upon an LOS alert from a relay-side optical input/output unit () or an LOF alert from a DSP () being input thereto. Upon successfully receiving an appropriate optical signal according to the change, the monitoring control unit () acquires transmission source information included in the optical signal, and detects an occurrence of erroneous connection of an optical transmission line in an OXC (), which serves as a relay apparatus, when the acquired transmission source information indicates an optical cross-connect apparatus that is a transmission source different from an original transmission source.