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. 12, 1994
Filed:
Mar. 13, 1992
Hironori Fujii, Hino, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A frame guard system comprises forward and backward guard circuits respectively having different guard stage numbers. A time after output of a frame alignment signal until first arrival of a pseudo out-of-frame signal is measured and the guard stage number of the forward guard circuit is switched in accordance with the measured time; whereas, a time after stoppage of the output of the frame alignment signal until first arrival of a pseudo synchronization signal is measured and the guard stage number of the backward guard circuit is switched in accordance with the measured time. In this way, since the respective guard stage numbers of the forward and backward guard circuits can be changed depending on a situation, the out-of-frame state after the determination of the synchronization can be prevented and thus a stable communication can be realized at all times.