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:
Feb. 26, 1991
Filed:
Oct. 12, 1989
Tsuyoshi Yamashita, Nagoya, JP;
Goro Kobayashi, Okazaki, JP;
Hisanori Nakamura, Toyota, JP;
Youichi Shibata, Toyota, JP;
Toshihiro Mori, Takatsuki, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Hokuyo Automatic Company, Ltd., Osaka, JP;
Abstract
An optical transmission device for interconnecting an optical full duplex transmission line and a half duplex transmission line. When a start bit of a data block of an electrical signal received from the half duplex transmission line is detected, a maintaining signal to maintain the same transmission direction is generated during which the data block can be transmitted. An optical signal is received from the optical full duplex transmission line and converted into an electrical signal. Similarly, a maintaining signal to maintain the same transmission direction is generated. In response to either one of the two maintaining signals, passage or stopping of signals by a driver for sending out an electrical signal to the half duplex transmission line and a receiver for receiving an electrical signal from the half duplex-transmission line are controlled. Possible interference of data is prevented and the transmission direction is changed over in this manner. Further, the level of an optical signal is monitored, and when the optical signal level becomes lower than a reference level, an abnormality warning data is transmitted succeeding to the data block.