The present invention analyzes an event reporting notification from a management agent system in an ATM exchange in a CMIP message analyzing unit of a TMN manager system and transmits the message determined by the event reporting message to an event reporting message optimizing unit, The report message optimizer divides the received event report message into a basic event report message processing block and an extended report message processing block to transmit the information required by the network operator. In addition, the above-mentioned block minimizes the occurrence of analysis errors and erroneous output messages generated as a library and a management agent modularized in accordance with the CMIP protocol recommended in the international standard, so that consistent information can be continuously maintained.
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