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. 09, 2002
Filed:
Apr. 05, 2000
Hiroya Egoshi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A transmission system having an uninterrupted switchover function for a plurality of lines is disclosed. The aims are to prevent unnecessary switchover and to provide high quality transmission system even using low quality lines with a minimal hardware configuration of memories and a control circuit. On the transmitting side, a pulse for phase synchronization is inserted at the top of each signal frame. Such frame signals are branched to transmit on a plurality of lines. On the receiving side, an alarm or error in signals from lines is detected on a frame basis. Then, a line switchover is carried out at the unit of a frame after frame phases are synchronized. To synchronize the frame phases, elastic memories for producing variable amount of delay are used in addition to fixed-amount delay circuits. This enables to insert a sufficient amount of delay to generate required timings for detecting errors, controlling and performing a switchover etc. Namely, time margin needed from the detection of an alarm or error to the execution of switchover is produced. Consequently, before the signal having an alarm or error is output, the line can be switched over without producing momentary interruption against signal traffic.