| 摘要 |
A transmission device capable of detecting a fault in communication from any of a root port, alternate port and backup port to a designated port. When the transmission device has designated ports, send request issuing unit thereof issues a send request from the designated ports to an associated transmission device to request same to transmit fault monitoring data. Receiving unit receives fault monitoring data from a root port, alternate port and backup port of the associated transmission device, and detecting unit detects a communication fault based on reception of the fault monitoring data. When the transmission device has a root port, an alternate port and a backup port, transmitting unit thereof transmits fault monitoring data from the root port, the alternate port and the backup port in response to a send request from an associated transmission device.
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