中国电信IPTV 技术文档 XX 科技有限公司 2010-10-12 第1 页 目 录 第一部分 项目规划设计篇 ............................................................................................................. 5 第一章 整体拓扑及概述 ......................................................................................................... 5 1.1 关键技术 .................................................................................................................... 5 1.2 电信城域网现网状况 ................................................................................................ 5 1.3 现网状况描述 ............................................................................................................ 6 1.4 现网实施 IPTV 后拓扑 ............................................................................................. 7 1.5 现网实施 IPTV 后网络描述 ..................................................................................... 7 1.6 三层组播技术 ............................................................................................................ 8 1.7 MSDP 协议 ................................................................................................................. 9 1.8 可控组播 .................................................................................................................... 9 1.9 二层组播 .................................................................................................................. 10 1.10 QoS 服务质量 ......................................................................................................... 11 1.11 IGMP ....................................................................................................................... 15 1.12 IGMP PROXYING ................................................................................................. 16 1.13 组播复制点下移 .........................................................
