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随着通信技术的高速发展，通信网的网络规模不断扩大，网络复杂性日益提高。为了提高服务质量和降低运行成本，对网络管理系统的要求越来越多、越来越高。所以，如何以合理的管理手段维护日益复杂的电信网，从而提高网络的效率，成为一个迫切需要解决的问题。ＩＴＵ－Ｔ提出了
With the rapid development of communication technology, the network size of communication networks has been constantly expanding, and the network complexity has been increasing day by day. In order to improve service quality and reduce operating costs, the requirements for network management systems are more and more and higher. Therefore, how to maintain an increasingly complicated telecommunications network with reasonable management means to improve the efficiency of the network has become an urgent problem to be solved. ITU-T proposed