| 摘要 |
There is provided a line status monitoring circuit, a node, a communication system, and a failure occurrence determining method which can detect occurrence of a failure in some of redundant lines between nodes. A line status monitoring circuit receives a frame through one of a plurality of lines from another node connected through a redundant transmission channel which is made redundant by the plurality of lines. The line status monitoring circuit includes a line-specific check frame monitoring unit 51. If a line-specific check frame having an added dedicated header corresponding to each of the plurality of lines is received through one of the plurality of lines from another node, the line-specific check frame monitoring unit 51 determines whether or not a further line-specific check frame corresponding to a frame for checking which is identical to a frame for checking which the line-specific check frame corresponds to is received through a predetermined number or more of lines within a predetermined time. Then, if the further line-specific check frame is not received through the predetermined number or more of lines within the predetermined time, the line-specific check frame monitoring unit 51 discards the frame for checking corresponding to the first received line-specific check frame.
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