本建议列出各种缩写，并说明itu- T在同步数字体系(SDH)网络和设备建议中使用的术语。

This Recommendation lists abbreviations and describes terms used in ITU-T Recommendations on synchronous digital hierarchy (SDH) networks and equipment.

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通过结合相关联的同步数字体系(SDH)设备的告警进行相关性分析，从而达到对网络故障定位的目的。

Throught the correlation analysis of the WDM and SDH alarms, we can locate the faults in the WDM network.

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鉴于同步数字体系SDH环形网络结构的巨大成功，WDM环形网络必定首先实用化、商用化，本文着重对各种保护恢复机制的自愈环网进行了分析与比较。

Whereas the vast success of SDH networks, it is WDM rings to be a fact firstly. Some kinds of WDMself-healing rings are discussed and compared.

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鉴于同步数字体系SDH环形网络结构的巨大成功，WDM环形网络必定首先实用化、商用化，本文着重对各种保护恢复机制的自愈环网进行了分析与比较。

Whereas the vast success of SDH networks, it is WDM rings to be a fact firstly. Some kinds of WDMself-healing rings are discussed and compared.

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