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. 14, 1992
Filed:
May. 21, 1991
Takeo Kaharu, Tokyo, JP;
Yuzo Kohsaka, Tokyo, JP;
Japan Aviation Electronics Industry Limited, Tokyo, JP;
Abstract
First and second optical couplers are inserted in linear bus type first and second data buses for transmission in opposite directions, respectively, by which each terminal equipment is connected to the first and second data buses. In the terminal equipment first and second monitor pulses are generated by a monitor pulse generator at different points of time in a low-level period of a frame synchronizing signal of each frame forming data to be transmitted, by which first data to be transmitted, appended with the first monitor pulse, and second data to be transmitted, appended with the second monitor pulse, are formed and are provided to the first and second optical couplers, respectively. The optical data signals branched from the first and second optical couplers are received by a common photodetector. A monitor pulse detector outputs an error flag when it detects either one of the first and second monitor pulses in the received sigal.