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:
May. 18, 1999
Filed:
Dec. 17, 1996
Katsuhiro Shirai, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A first transmitting unit provided in a first station transmits a first optical signal to a second receiving unit provided in a second station via an optical transmission line, the first optical signal including first overhead information. A first receiving unit provided in the first station receives a second optical signal transmitted from a second transmitting unit provided in the second station via the optical transmission line, the second optical signal including second overhead information. A first inserting unit inserts first data for detecting line-disconnection troubles into the first overhead information, the data inserting being performed without causing a data amount of the first overhead information to be increased, contents of the first data for detecting line-disconnection troubles being different from contents of second data for detecting line-disconnection troubles being inserted into the second overhead information by a second inserting unit provided in the second station. A first extracting unit extracts the data for detecting line-disconnection troubles from the overhead information included in an optical signal received by the first receiving unit, the data for detecting line-disconnection troubles being either the second data for detecting line-disconnection troubles if the second optical signal has been received by the first receiving unit or the first data for detecting line-disconnection troubles if the first optical signal has been received by the first receiving unit as a result of returning.