Technological advances and competitive environment of the wired network measures
Video Co., Ltd. Shenzhen Tianwei Xu, deputy chief engineer country
Present, and Cable television Closely related to digital technology and network technology is undergoing huge changes, source coding, transmission network, access technology and home terminals are moving in the direction of integration, technological advances led directly to business integration. On the other hand, radio and television industry and Telecommunications Trade barriers between the policy loosening, the internal Product and Broadcast Radio and Television Network Company had resulted in the loss of the contents of advantages, IPTV Such as the rise of new media and satellite broadcasting, ground Digital TV To the industry, such as internal Competition Intensifies, all indicate the cable industry will soon face a violent storm. In this critical moment of life and death decision, how do we deal with, which is placed in the general China Cable TV Operation In front of a very serious issue.
1, the four characteristics of the current technology
Technology has become a media critical to the success of competition and survival. Digital technology, network technology and communication technology integration, to the cable industry has brought great challenges and great opportunities, correct understanding of current technology trends for the conduct of our work is extremely important. Current technological development shows the following four characteristics:
1, the new compression technology makes video transmission greatly reduced the threshold
To international standards H.264 / MPEG 4 AVC, is developing national standards among the AVS and Microsoft Companies represented the next generation of WMV9 Video Compression To MPEG2 coding standard will be led by the current video compression coding standard pose a threat, and will dominate. To improve system fault tolerance and robustness, while the new standard in compression efficiency leap of progress made. Image quality while ensuring the same premise, H.264/MPEG4AVC only the bandwidth required for MPEG2 encoding 36%, in other words, under the existing MPEG2 system, the bandwidth of standard definition programming encoded 3-6Mbps, 1080p high-definition programming coding bandwidth of 18-25Mbps for standard conversion, H.264 encoding system bandwidth, respectively, under the only 1-2Mbps and 6-8Mbps. Therefore, the video shows the threshold for the transmission network will be greatly reduced, the original transmission Broadcasting Grade the quality of video bandwidth bottlenecks exist in the access network, such as: Xdsl, LAN, etc., will also have the transmission capacity, and decreased bandwidth for IP backbone networks geometric pressure drop. The emergence of these results mean that the telecommunications network from bandwidth point of view, it will have broadcast-quality video transmission capability.
Next-generation video compression technology has been completed Laboratory R & D stage, in business to promote the early stages of maturity from the large-scale application is possible. Terminal equipment, from scratch, Harmonic and Tandberg on the CCBN2005 showcasing models were MV100 and EN5930/5990 compatible with Mpeg2 and H.264AVC standard encoder. Terms from the decoder chip, Broadcom, Conexant and ST introduced the models were BCM7411, CX2418x and STB7100 support H.264AVC format decoding chips and the terminal equipment manufacturers have begun to support research and development and production of H.264 terminals, So. H.264 era is coming.
2, IP-based video transmission technology agreement perfected
Process with the depth of digital television, television programs from Make , Storage, broadcast, distribute, exchange, transmission, reception and other links are available framework on IP agreements. Gigabit Ethernet technology matures to the program storage, transfer, broadcast and create the conditions for the current TV station Program production and Broadcast system , And media asset management system, and both are in the framework GE Network and connectivity over. To IP over DW DM or MSTP to represent a variety of IP over Optical Transmission and Light Switch Mature for the video cleared the way for metro transport. IGMP (Internet Group Management Protocol), RTP (Real-time Transport Protocol), RTCP (Real-time Transport Control Protocol), RSVP (Bandwidth Reservation Protocol), RTSP (Real Time Streaming Protocol) applications such as the maturity of the agreement to resolve the IP network to transmit video there is delay, jitter, and broadcasting QOS issues, makes IP networks by improving the quality of service levels. Therefore, IP-based video transmission protocol is improving daily, and because of the flexibility with scheduling and management of intelligence and the integration of sexual transmission, this technology approach also represents the future direction of development.
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