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Switching-device-for-detecting-interruptions-in-transmission-lines

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Switching device for detecting interruptions in transmission lines

Details

Inventors: Inaba, Hajimu; Miyashita, Hideo;
Assignee: Fujitsu Fanuc Limited (Tokyo, JP)
Primary Examiner: Smith; Jerry
Assistant Examiner: Fleming; Michael R.
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik

In a transmission system employing a plurality of parallel lines for transmitting serial digital signals, means are provided in each line for detecting and disconnecting any line on which transmission is interrupted comprising a converter for producing two signals of opposite polarity, a receiver for reconverting the signals connected to the converter by a pair of transmission lines, an exclusive OR gate connected to the pair of transmission lines for providing an output when normal signals of opposite polarity are present, and a switch comprising an AND gate converted to the receiver and to the exclusive OR gate which disconnects the receiver when no output is received from the exclusive OR gate. The received signals from each line are combined through a common OR gate.

DETAILED DESCRIPTION The object of the present invention is to provide a device for switching the transmission lines, wherein, by the logical exclusive OR from a set of digital signals having an opposite polarity from each other and transmitting on a pair of transmission lines, the interruption of the transmission lines is detected, the interrupted lines are disconnected, and digital signals are sent through the other non-interrupted lines, and thus the transmitting signals are not interrupted.
According to one aspect of the present invention, there is provided a device for switching the transmission lines having a function of detecting an interruption of said transmission lines comprising: a plurality of pairs of transmission lines which can transmit sets of digital signals with the opposite polarity from each other; a plurality of drivers which send out said signals to said transmission lines; a plurality of receivers which receive said signals transmitted through said transmission lines; a plurality of AND gates which receive outputs from said receivers; an OR gate which receives the outputs from said AND gates; a plurality of exclusive OR gates which are connected with said each pair of transmission lines; and a plurality of filters which receive outputs from said exclusive OR gates and supply said AND gates with outputs thereof.

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