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:
Jun. 24, 1986
Filed:
Mar. 15, 1984
Shinichiro Aoki, Sagamihara, JP;
Ryushiro Yoshizawa, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a redundant switchover system for a TDMA satellite communication system for relaying messages from earth station to earth station (A, B, C) via a communication satellite (SAT), an initially active terminal unit (1) for determines at an early stage that the transmit burst synchronization is lost, and an initially stand-by terminal unit (2) determines at a later stage that the transmit burst synchronization is lost. Thus, a fault in only the transmit portion of a first unit, which is undetected by other means, is detected by the first terminal unit, but not the second terminal unit. The second terminal unit does not determine loss of transmit burst synchronization until after the second transmit portion has been in operation for a sufficient period of time to establish whether it is operating properly.