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。
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.
通信网络可以按照其物理排列或拓扑结构来分类。有三种常见的拓扑结构：星型、总线型和环型。
Communication networks can be classified in terms of their physical arrangement or topologies. Three common topologies are the star, bus, and ring.
有三种常见的拓扑结构：星型、总线型和环型。
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