| 摘要 |
A bus-redundancy type apparatus for a transmission line is disclosed, which comprises first and second transmission lines respectively provided as a normally operating transmission line and a stand-by transmission line for data transmission in a transmitting system, in which bus-access control is performed, first and second carrier detectors for receiving transmission data from said respective first and second transmission lines and for detecting carrier components in the transmission data, a carrier-disappearance detector for receiving the results of detection by the first and second carrier detectors and for providing a carrier-disappearance signal when it is detected that neither of the first and second carrier detectors detects any carrier component, a transmission line-switching command generator for providing a transmission line-switching command, to select either one of the first and second transmission lines, a switching unit for selecting transmission data from the first and second transmission lines, to be received, and a controller for receiving a carrier-disappearance signal from the carrier-disappearance detector and a transmission line-switching command from the transmission line switching command generator, and for supplying the transmission line-switching command to the switching unit at the time of reception of the carrier-disappearance signal.
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