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:
Dec. 19, 2000
Filed:
Apr. 06, 1998
Hiroya Egoshi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A transmission system for transmitting data of a synchronous digital hierarchy SDH frame includes a transmission terminal, a transport terminal and a reception terminal linked together by a working channel line and a protection channel line in a redundant structure. Each of the transmission terminal and the transport terminal includes an alarm indication insertion unit which inserts an alarm indication in the SDH frame, the alarm indication indicating whether a related channel line has failed. The SDH frame containing the alarm indication is transmitted to the reception terminal prior to transmission of the data on the related channel line. The reception terminal includes a control unit which outputs a selected one of the SDH frame on the working channel line and the SDH frame on the protection channel line in response to the alarm indication received by the control unit. When one of the working channel line and the protection channel line has failed, the control unit switches a connection from one of the working channel line and the protection channel line to the other without causing instantaneous cutoff.