| 摘要 |
PROBLEM TO BE SOLVED: To continue communication with high reliability despite a local rainfall by setting the transmission capacity of a stand-by circuit smaller than that of an active circuit that secure the connection among the communication nodes and switching the active circuit to the standby circuit to continue the communication if the active circuit has its abnormality. SOLUTION: In this radio communication network system, the communication nodes 10-1, 10-2, 10-3 and 10-4 are connected to each other in a ring shape via the working circuits (radio transmission lines of a working system) 21-1, 21-2, 21-3 and 21-4 and the standby circuits (radio transmission lines of a standby system) 22-1, 22-2, 22-3 and 22-4, respectively. Then the transmission capacity of the circuits 22-1 to 22-4 is reduced compared with that of the circuits 21-1 to 21-4. Thus, the necessary reception input levels of circuits 22-1 to 22-4 can be reduced by a degree equivalent to the reduced transmission capacity to secure the desired circuit quality.
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