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Fortunately, the emergence of Internet Protocol Television IPTV services not only solves these two problems, but also conforms to the trend of triple-play network.
The other is the construction of the dedicated network. This reduces the bandwidth pressure on the bearer network and improves QoS performance. Presently, the physical dedicated network is recommended as an interim solution for building the MAN part of IPTV bearer network, and the IPTV services may share the improved access network with other services.
With the assistance of the Video Delivery Network (VDN), VoD may use the 80/20 Rule to deliver 20% of hot TV shows to the bearer network edge nearby the subscribers. However, VoD can only adopt unicast for transmission. However, the logical network requires numerous alterations to the existing network.
At the multicast replication point, the network device replicates the multicast stream according to the request of Internet Group Management Protocol (IGMP) at the port.