| 摘要 |
A circuit for switching transmission lines and capable of detecting an interruption in the transmission lines comprises a plurality of pairs of transmission lines (24) which can transmit sets of digital signals with an opposite polarity to each other. A plurality of drivers (D1,D2---Dn) feed the signals to the transmission lines and a plurality of receivers (R1,R2--- Rn) receive the transmitted signals. A plurality of AND gates (A1,A2---An) receive outputs from the receivers and an OR gate (23) receives the outputs from the AND gates. A respective exclusive-OR gate(31) is connected to each pair of transmission lines, and a respective filter (32) receives the output from each exclusive-OR gate and drives the respective AND gate. Thereby, when a transmission line (24) is interrupted, detection of the interrupted transmission line is carried out, and the transmission line is switched out so that the transmitted signal is not interrupted.
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