SHAONET, the first WDM all optical network testbed in China, is a metropolitan self-healing ring. A novel OADM having protection function is adopted.

SHAONET是国内自主开发的第一个WDM全光试验网平台，它采用了一种新型保护结构的OADM，具有很强的自愈功能。

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By utilizing the advantages of self-healing function that SDH ring network has, the paper analyzes the networking technology and MSP mechanism in detail.

利用SDH环形网络具有自愈能力的优点，详细分析了组网技术及复用段保护机制。

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