Method for mutually connecting network modules
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PURPOSE: To enable determinion of the time of fail-over from a primary redundant network module (NIM) to a secondary NIM by fail-overing the primary NIM to the 2nd NIM, when the primary NIM determines the disablement of communication with a 1st network and when the 2nd NIM determines the possibility of communication with the 1st network. CONSTITUTION: A NIM-B starts to transfer a request for retransferring a redundant message to an NIM-A through an LCN bus 16 to the NIM-A. If the NIM-B does not receive a response to the request, the NIM-B receives a status message that the NIM-A cannot communicate with any module in an LCN 12 from the NIM-A through a UCN bus 18. Since the NIM-B cannot communicate with the LCN 12, the NIM-B sends a message informing the NIM-A of the stoppage of the operation to the NIM-A through the bus 18. When the message is received, the NIM-A stops its operation and is fail-overed to the NIM-B. Consequently, the time to fail-over from the primary NIM to the secondary NIM is determined. COPYRIGHT: (C)1991,JPO