Network efficiency is a major index for the evaluation of network performance, which reflects the target effect produced by unit management cost within a certain period.
网络的功效评价是网络性能的重要指标之一，它表示一定时期内单位管理成本所产生的目标效果。
SDH is made from SDH network unit. Its basement of transmission technology is frame structure whose net functions include normal management, trouble management and property management and so on.
SDH由SDH网络单元组成，其传输技术基础是帧结构，其网络功能包括一般性管理、故障管理、性能管理、配置管理、安全管理。
Network management system, network unit, network, method and computer program product.
网络管理系统，网络单元，网络，方法和计算机程序产品。
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