Multiplex communications – Wide area network – Packet switching
Patent
1989-10-12
1991-02-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 370 24, H04B 1002
Patent
active
049966839
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.
REFERENCES:
patent: 4288869 (1981-09-01), Kolodzey et al.
patent: 4641378 (1987-02-01), McConnell et al.
patent: 4881220 (1989-11-01), Yomogida et al.
Kobayashi Goro
Mori Toshihiro
Nakamura Hisanori
Shibata Youichi
Yamashita Tsuyoshi
Hokuyo Automatic Company, Ltd.
Marcelo Melvin
Olms Douglas W.
Toyoda Koki Kabushiki Kaisha
Toyota Jidosha & Kabushiki Kaisha
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