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. 19, 1988
Filed:
Jul. 24, 1986
Norihito Tokura, Nukata, JP;
Hisasi Kawai, Toyohashi, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
Disclosed is a local area network for a vehicle which comprises a plurality of terminal stations each having an input/output port for various signals, a main-loop formed by series connection of the terminal stations and transmission lines, a sub-loop arranged in parallel to the main-loop and formed by series connection of the terminal stations and transmission lines, and controllers. One of the terminal stations receives a large amount of information such as an audio signal from an audio transmitter and one of the other terminal stations supplies a large amount of information such as an audio signal to an audio receiver. When the main-loop is in a normal operation state, the main-loop operates as a token-passing system and the sub-loop acts as a direct transmission route from one of the terminal stations to another terminal station, and when the main-loop is in an abnormal operation state, the main-loop is coupled with the sub-loop and the transmitting of information such as an audio signal is stopped, and simultaneously, the sub-loop is switched to the token-passing system. Thus, the double loops, i.e., the main-loop and the sub-loop, are effectively utilized. In addition, any decrease in the reliability of various signals transmission when a failure of the main-loop occurs, can be prevented.