| 摘要 |
PURPOSE:To obtain a communication circuit network which has high expanding performance and high reliability, by connecting the input and output channels having paired nodes to the input and output channels of other node pairs. CONSTITUTION:Paired transmission lines 1 are connected among nodes 8 arrayed on a matrix and terminals 3 connected the nodes 8. Each node 8 has 8 pairs of input/output channels, and therefore 8 pairs of lines 1 are connected to the node 8. In this case, a composite loop is formed because the node 8 has a multi-connection structure. Thus the communication is possible between two optional points through an alternative circuit although the node 8 has some fault or the line 1 is disconnected. Then the input and output channels having paired nodes 8 are connected to the nput and output channels of other paired nodes via a pair of lines 1. In such constitution, the breakdown can be avoided for a communication circuit network regardless of a partial fault. This can increase the reliability of the network.
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