| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission channel redundant switch system that can avoid momentary interruption at execution of switch-back processing in the 1:N type transmission channel switch system and attain long time operation of Extra Traffic in a standby transmission channel. SOLUTION: The transmission channel redundant switch system of this invention is characterized in that the switch system does not fixedly reserve a standby system on the occurrence of a fault, but dynamically decides a transmission channel used for the standby system on the basis of 'quality of transmission channel' and 'priority of transmission channel' at that point of time when the fault takes place and is recovered, updates the priority of transmission channels on the basis of the priority of channels accommodated in each transmission channel and can revise the correspondence between a physical transmission channel and a channel number used for the transmission channel.
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