| 摘要 |
PROBLEM TO BE SOLVED: To provide a data management system which can immediately restore even in the case where a private branch exchange has a fault and cannot restore it by itself. SOLUTION: The private branch exchanges are connected together via a LAN and exchange periodically the internal information with each other to show the operating state of each exchange. Thus, the operating states of private branch exchanges can be grasped with each other within the LAN. When a system has a fault and cannot restore it by itself in the LAN, a program needed for restoration of the fault is transferred to the faulty exchange from another private branch exchange included in the LAN. As a result, the fault can be automatically relived.
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