| 摘要 |
A communication method for a network where a plurality of communication devices are interconnected and a plurality of pairs of working channels and backup channels are set in two paths between adjacent communication devices to perform 1:1-protection communications. For information traffic of a type where importance determined by the type of information to be transmitted is relatively high, the 1:1-protection communications is performed by using working channels set in one of the two paths when there is no failure, and by switching to backup channels set in the other of the two paths when a failure is detected. For information traffic of a type where the importance is relatively low, communications is performed by using channels other than the working channels set for the information traffic of a type where importance is relatively high, in the two paths, when there is no failure.
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