Chapter 2 covers the distributed control problem of optical multicast in overlay multicast networks.
第二章主要集中于研究层叠组播网络中光组播的分布式控制问题。
参考来源 - 面向宽带IPTV业务的IP over optical层叠组播网络技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Optical multicast provides a way of sending message from one node two multiple nodes in optical network.
光网络多播为高效地运行视频会议和网络电视等业务提供了可能性。
The fast restoration of optical multicast trees is realized through this part restoration, which focuses on failed node or link.
通过这种集中于故障链路或节点的局部恢复，组播树的快速恢复得以实现。
However, owing to some limitations on optical buffer, light splitter, and wavelength converter, optical multicast at optical layer offers different characteristics from those at IP layer.
然而，光层组播由于光缓存、光分束和光波长变换等光器件的限制，呈现出和IP层组播不同的特点。
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