SONET环
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This paper introduces the characters of resilient packet ring (RPR) technologies, and the advantages of RPR comparing to SDH/SONET and Ethernet when provides data services in ring topology.
介绍了弹性分组环（RPR）技术的特征，将其与SDH/ SONET、以太网技术作了对比，以体现其在环型拓扑结构上支持数据业务的优势。
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Cut through a Sonet ring and the highly reliable optical gear just sends traffic in the other direction.
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