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:
Apr. 07, 2009
Filed:
Jun. 17, 2004
Tatsuya Shiragaki, Minato-ku, JP;
Tatsuya Shiragaki, Minato-ku, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention is intended to find a connecting state of a bidirectional signal repeater with an optical switch to prevent an erroneous registration of the topology. The present invention also has an object to confirm the normality of a link between the optical switch and bidirectional signal repeater even when no main signal is flowing by directing a signal from the bidirectional signal repeater to the optical switch. An identifier is added to the signal. One bidirectional port pair of the optical switch is set into a loop back configuration, without setting the remaining bidirectional port pairs into the loop back configuration. A controller checks whether or not a signal received by a regenerator is the same as a signal transmitted from a different regenerator. The normality of the link between the bidirectional signal repeater and optical switch is confirmed to evaluate the quality of a signal which returns from the bidirectional port pair which is in the loop back state.