Research On Multicast For IPTV Services In 3Tnet

In these years, with the explosive development of Internet, not only the rapid growth of the broadband subscribers and the increase in the bandwidth of the network has occurred,but also a lot of new applications in Internet have occurred, many of which are multimedia applications that need quite big bandwidth, such as network video conferences, network audio/video broadcast, video on demand, IPTV and so on. For these new applications, traditional unicast technology (one to one) and broadcast technology (one to multi) will take great pressure on the network.Face to the high-bandwidth damand pressures of IPTV, multicast is a good choice.Multicast is a technology that can send data to multiple receivers in an effieient and extendable way.Mulicast source sends packets to a specific multicast group, and only the address which belongs to this multicast group can receives the packets.In applications in video,there is only one multicast source.The multipling growth of the users will not upgrade the network bandwith.Because no matter how many target addresses are,there is only one video steam in the bone network.It calls that send once,boardcast in the group . Multicast technology impoves the efficiency of data sending and reduces the possibilities of the traffic congestion in bone network.This paper studies the high-performance broadband information network of technical standards,proposed education CPN reform program of SCUT.Discussed the multicast technology and analyzed the technology of IGMP,multicast routing protocols and multicast algorithms.Integrated project of HD interactive services operation support platform construction and demonstration in 3Tnet,introduced the education CPN banacast system application layer multicast,proposed banacast system multicast scheme,analyzed banacast system structure.Finally,according to 3Tnet education CPN with banacast system demonstration and service testing.