IPTV end business applications and technology trends-IPV, Optical Ethernet, Cabl
IPTV systems technology and network technology are inseparable. IPTV involves the main techniques include: video codec, streaming media, digital rights management, CDN, multicast, middleware, electronic program guide and technology, these technologies are still in constant development update. IPTV technology of video on demand, switched broadcast video services, digital cable TV services such as business, widely applied.
First IPTV VOD in the traditional business applications. United States, Canada and Europe cable operator has fully launched the VOD cable television business, and this business has been loved by the majority of cable users and welcome. However, although the VOD business end to give the end user is MPEG2TS spread, but it uses IPTV technology and the use of IPTV technology to promote such business development and popularization of VOD.
In IPQoS and Gigabit Ethernet technology is mature before light, cable VOD VOD business, video streaming, video from video server to edge servers or edge QAM modem transmission, SDH or SONET network must be used. In this way the overhead costs of large and difficult to meet the growing bandwidth needs of VOD services. Therefore, when the cable VOD services can only be a nice concept and nice presentation, it is difficult to be large-scale commercial. As IPTV technology and mature, cable VOD service has been able to use the gigabit optical Ethernet, will be video streaming to IP-VOD mode (MPEGoverIP) from the video server to the edge QAM modem, and many manufacturers have received IP packet and complete IP packet stream to MPEG2 conversion into edge QAM modem. This network architecture greatly reduces the transmission cost of VOD streams to improve system scalability, making large-scale commercial cable VOD services possible.
Followed IPTV switched broadcast video technology in business applications. More and more specialized cable channels, according to the 80/20 rule, 80% of users will be essential to watch the hundreds of sets of program 20% of the remaining 80% of the program generally is 20% of the users to watch. If all of the hundreds of sets of programs are sent "broadcast" to all cable customers will undoubtedly take up a lot of spectrum resources and network resources.
Switched broadcast video service, is to fall 80% in the number of such programs as switched broadcast video service program, these programs will not be transmitted to all cable subscribers, but only sent to all cable front and sub-front, once a user selects a certain cable television was as switched broadcast video services, the channel program, the channel will broadcast programs to cable TV business group where users of all users. A business group is an optical node, or an optical node and the adjacent optical node are even a few of all cable subscribers.
IPTV technology matures, so switched broadcast video services has become very easy to implement and low cost. Switched broadcast video programs are available on IP multicast services of the way through Gigabit Ethernet optical transmission to the cable TV front-end Gigabit switches. Once a switched broadcast video services channel program selected by the user to see, Gigabit switches, the user will be sent to the program associated with the edge QAM modem, and thus to be broadcast to all cable TV business group users.
Furthermore is the IPTV technology in the digital TV services in the application. IPTV enables cable system technology to provide new forms of digital TV business, cable digital TV is one of the DVR business. This service allows cable operators to push a number of video users with a hard drive DVR cable STB functionality, the user at a convenient time for the election of view, it also enables users to record deposit is or will be playing the show . To this DVR is a large-scale commercial operations, the safety program is the most crucial factor.
As connectivity and transport layer encryption based conditional access technology for the DVR business, is neither easy nor flexible, and not safe enough. Therefore, DVR service to use based on the content itself encrypted DRM technology. Push by the cable operators generally DVR video before being pushed Jibei encrypted with IPTV's DRM technology packaged and stored, and user-recorded DVR programs are generally in the user STB conditional access decrypted by the right, IPTV's DRM-encrypted then packaged and stored.
IPTV launch IPTV service terminal technology is a key element. Features include three aspects: First, to support the existing LAN or DSL network transmission, reception and processing IP data and video streaming; Second, support for MPEG-1, MPEG-2, MPEG-4, WMV and Real and other video decoding, support for video on-demand, TV screen displays and digital rights management; Finally, the support of HTML web browsing, to support online games.
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