[Photo] IPTV technology, system components and its development trend-IPTV, video broadcasting, multi
Article by hi joiney
Chapter Overview 1.1 IPTV ReviewBooming broadband IP network operators to provide a unique business opportunity. Applications, video, games, stocks, e-commerce, have become ever wonderful for broadband. To seize the opportunity, IP network operator needs to build its physical network based on a set of high value-added services for broadband network operations support platform. On the one hand, to attract a variety of value-added service providers to provide services in this platform, on the other hand, the platform will provide users with a simple bridge for access to services. Therefore, IPTV services as a value-added services have been charged with the market conditions. IPTV video broadcasting systems are mainly there for a long time Multicast IGMP protocol technology and based on existing IP metro network for the actual operating conditions and operator demands, proposed management platform architecture and software architecture design, in theory solution to the client from the center of the video broadcasting technology and management issues. 1.2 IPTV related concepts IPTV: practice is to use broadband multimedia networks to deliver a clear television programs, its image quality is much higher than the current audio cable signal quality, up to DVD surround sound audio effects, and even the AC-35.1-channel effects. The transmission program “Channel Number” is also more than the traditional wired networks, traditional cable television transmission up to about 70 analog channels, and broadband multimedia network set up to transmit more than 200 DVD-quality digital TV programs. Live: The use of UDP protocol, using IP multicast technology, through an internal LAN or the Internet to digital video programming broadcast to the desktop computer, customers can use real-time PC, or set-top box can accept the broadcast, it can live. Editing and Broadcasting: The timing of the stored program for a multi-channel digital video programming simultaneously in LAN or Internet play, each user on the computer to use the TV’s way of random connections, select, switch, receive the necessary programs. 1.3 IPTV key technologies?? IP MulticastConsider the characteristics of IPTV business, require network support for IP multicast environment. In video transmission, IP Multicast technology has its unique advantages?? In the multicast network, even if the number of users doubled, the trunk does not require increased bandwidth, so that network operators can significantly reduce the cost of investment. Multicast is to allow one or more of the sender (multicast source) sends a single packet to multiple recipients (once, while the) network technology. Multicast source to send packets to a specific multicast group, and only belong to the multicast group address to receive the data packet. Multicast can greatly save network bandwidth, because no matter how many destination address, in any of the network links only send a single packet. It improves data transfer efficiency and reduce the possibility of backbone network congestion occurs. Multicast group of hosts can be in the same physical network, you can also come from different physical network (if any multicast routers support). The network model is shown below: Figure 1 Multicast Network 1.4 this work to be done1, the program selection Provincial telecommunications network for the actual situation in sub-multicast video transmission Multicast and Unicast Unicast two methods proposed for IPTV multicast network access bandwidth, more in line with the existing backbone bandwidth is enough and the lack of status, multicast can significantly reduce the backbone bandwidth, but that each terminal have received high-quality video programming. According to provincial telecom operators to manage the core features of proposed management platform designed to target the provincial telecom operators, telecom operators as in municipal operations is not completely right, so give up to municipal programs. According to the multicast backbone of the provincial level, single-center proposed provincial and provincial-type programs distributed IPTV IPTV program, both programs are likely to be used in practical applications, it is proposed that two kinds of program design. 2, protocol and Theoretical Review Based IPTV business properties, select the IP multicast technology as the basis for building IPTV services. Discusses the IP multicast technology, UDP and related technology constitutes agreement to introduce encryption, key technologies, authentication works. 3, IPTV system construction Discusses IPTV services constitute great works.4, IPTV IPTV system construction and management system software architecture design Discuss design ideas and IPTV IPTV system management software architecture design
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