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:
Jul. 03, 2001
Filed:
Mar. 13, 1998
Hirofumi Araki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed is a method of switching between redundant routes of a communication system in which terminal stations are connected by an uplink transmission line and a downlink transmission line that are devoid of redundancy. The method includes adopting working/protection redundancy for first and second apparatuses constituting each terminal station, detecting line failure, which has occurred on the side of the first terminal station, by the second terminal station, multiplexing additional data, which includes a line failure alarm, onto main signal sent from the second terminal station to the first terminal station (or inserting the line failure alarm in the form of overhead bytes), and causing the first terminal station to perform line switching upon detecting the alarm included in the additional data or overhead bytes.