This paper briefly introduces the concept of Internet Protocol Television, studies the application of multicast in IPTV, and also gives a mechanism to realize IPTV on ACR.

• 摘要介绍网络电视(IPTV)和组播技术的概念，及实现IPTV业务必须的关键技术，给出了在大规模接入汇聚路由器上实现IPTV业务的一种系统结构。