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. 27, 2007
Filed:
Nov. 15, 2001
Minoru Tateno, Yokohama, JP;
Hideaki Koyano, Yokohama, JP;
Masato Kobayashi, Yokohama, JP;
Yasushi Yoshino, Yokohama, JP;
Tatsuru Iwaoka, Yokohama, JP;
Kazumaro Takaiwa, Yokohama, JP;
Akio Takayasu, Yokohama, JP;
Minoru Tateno, Yokohama, JP;
Hideaki Koyano, Yokohama, JP;
Masato Kobayashi, Yokohama, JP;
Yasushi Yoshino, Yokohama, JP;
Tatsuru Iwaoka, Yokohama, JP;
Kazumaro Takaiwa, Yokohama, JP;
Akio Takayasu, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A redundant changeover apparatus causing no frame synchronization loss even upon occurrence of changeover between working system and protection system. In case of an in-apparatus synchronization system, when two input signals which are mutually asynchronous in phase are changed over by a changeover switch, a changeover switch, a clock extractor, a PLL circuit, and a clock changing portion transmit signals with clocks before the changeover being gradually changed to clocks after the changeover. Alternatively, in case of an in-apparatus synchronize system, data are separated from clocks so that the data are once changed to data with reference clocks, and then for the data, clocks before the changeover are gradually changed to clocks after the changeover.