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。

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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。

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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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