Multiplex communications – Wide area network – Packet switching
Patent
1989-10-12
1991-01-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 24, H04B 1002
Patent
active
049858866
ABSTRACT:
A branching device to send out data received at an arbitrary one of three terminals thereof through the other two terminals. In the device, the terminals are coupled to each other by means of photo-couplers. The head of a data block received by each receiver connected with each terminal is detected, and after such detection of the head, a signal which specifies the length of the data block is generated. Thus, after communication data are received by way of an arbitrary one of the terminals, reception of communication data by way of the other two terminals is inhibited while transmission of the communication data is enabled in response to the signal specifying the data block detected.
Since the transmission lines of the three directions are electrically isolated from each other by the photo-couplers, even when a failure of short-circuiting occurs at a main transmission line or a branch line or the like, communications are continued bypassing the location of the failure similarly as in the case of a failure of breaking of a wire.
REFERENCES:
patent: 4288869 (1981-09-01), Kolodzey et al.
patent: 4641373 (1987-02-01), Shutterly
patent: 4641378 (1987-02-01), McConnell et al.
patent: 4742572 (1988-05-01), Yokoyama
patent: 4747094 (1988-05-01), Sakaguchi et al.
patent: 4881220 (1989-11-01), Yomogida et al.
Kobayashi Goro
Nakamura Hisanori
Uchida Akira
Yomogida Toshihiko
Marcelo Melvin
Olms Douglas W.
Toyoda Koki Kabushiki Kaisha
Toyota Jidosha & Kabushiki Kaisha
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