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Combined with the network management architecture defined by the ISO and the TMN, and the concepts of service-oriented network operation and maintenance management, this paper proposed a hierarchical model of network fault diagnosis. The model contains two modules which are in-layer fault diagnosis and between-layer fault diagnosis, in different layers it chose appropriate fault diagnosis methods accordingly, and the dependency graph method was used to execute the between-layer fault diagnosis. It proved that these two modules could cooperate and complement each other well, and improved the efficiency of network fault diagnosis.
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