Network management is one of the most important parts for Synchronous Digital Hierarchy ( SDH ) networks.

网络管理是同步数字体系 ( SDH ) 网络的重要组成部分.

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This Recommendation provides an information model for the Performance Monitoring of Synchronous Digital hierarchy ( SDH ) Network.

本建议给出了同步数字系列 ( SDH ) 网络的性能监视信息模型.

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