| 摘要 |
Desired information is transferred and output to one monitor equipment by switching logical channels using an ATM switch. Also when a plurality of transmission equipments are connected with a transmission line, the start point and the terminating point of the transmission line are connected to form a ring transmission line, and the transmission equipment disposed at the start point is defined as the first node and the transmission equipment disposed at the terminating point is defined as the Nth node, the nodes defined as odd numbers are sequentially disposed on the ring transmission line in a clockwise direction, and the nodes defined as even numbers are disposed in a counterclockwise direction.
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