| 摘要 |
PROBLEM TO BE SOLVED: To provide a dual multi-protocol switch which can carry on communications without any break of the communications when in-use and standby systems are switched. SOLUTION: The dual multi-protocol switch comprising an in-use system which performs data processing in operation and a standby system which is switched to the in-use system if the in-use system has a trouble, sets one system to the in-use system according to the external settings, transmits data from an input circuit not to the standby system, but to only the in-use system to process the data, circulates them to an output circuit to put the in-use system in operation, actuating the standby system so that it can always operate, transfer in-network setting information in real time to the standby system through a common memory where the in-network information s recorded between the in-use and standby systems each time the in-network setting information of the in-use system is altered so that the in-use system is switched to the standby system in case of a trouble.
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