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目前．随着宽带互联网向家庭用户提供视频点播、电视节目、可视电话、网络游戏、多媒体信息等流媒体类业务的迅猛增长,IPTV业务也随之成为宽带多媒体领域中大家关注的热点。由于开展IPTV业务对承载网的要求有别于普通上网业务．因此,运营商需要针对IPTV业务对既有传输网络尤其是承载接入进行必要的改造．以达到大带宽．高速率．可管理．可控制．具备交互性和安全性的要求。
Currently. With broadband Internet providing home users with the rapid growth of streaming media services such as video on demand, television programs, video telephony, online games and multimedia information, the IPTV service has also become a hot spot for everyone in the field of broadband multimedia. Due to the carrying IPTV service bearer network requirements are different from ordinary Internet services. Therefore, operators need to make necessary modifications to existing transmission networks, especially bearer access, for IPTV services. To achieve large bandwidth. High speed. Manageable. controllable. Have interactivity and security requirements.