| 摘要 |
A duplex communication path switching system provided at each of nodes connected by a communication path which is formed of clockwise and counterclockwise transmission lines in a ring network. The duplex communication path switching system includes a checking circuit for checking whether or not each of a plurality of units of the signal received from each of the clockwise transmission line and the counterclockwise transmission line is normal, and a switching circuit for switching the communication path between the clockwise transmission line and the counterclockwise transmission line based on checking results obtained by the checking circuit so that units which are normal are selected from the signals. Each of the plurality of units of the signal has a constant speed and is provided with frame information defined for the signal transmitted through the communication path, the frame information being used to divide the signal into the plurality of units.
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