Design And Implementation Of CDN System For BTNG In A Province

Faced with the convergence of opportunities and challenges in the triple play,two-way TV services will continue to develop with the development of "multi-service"operations.The construction of HDTV business system needs to consider the expansion of business development,and the expansion capacity of the user can be increased without interruption.The CDN(Content Delivery Network)system satisfies the distribution of business Content of 9+1 cities in the province,Adopting"centralized deployment and centralized push flow" in the provincial center,Deploying CDN components(including cache servers)at the center of the province,the CDN components will be deployed of in the city later.The system can support DVB+OTT mode at the same time,and it can also satisfy the video service of traditional set-top box,smart set-top box and OTT client.The CDN technology system reduces the impact of a large number of concurrent businesses on the network makes the provincial center transfer faster and more stable to the city video and other contents.The research of this paper first introduces the CDN technology and its development in China and abroad.It analyzes the current CDN business demand of a provincial Radio and Television Network and designs the CDN system of radio and television network in a province.This paper combines the CDN technology and the basis of the personalized system requirements of one BTNG,developing on NGOD Architecture.The system is deployed on Dell 730 hardware device and centOS Linux open source software environment,uses redundant networking design and according to the characteristics of C/S system architecture.Designing and achieving the'real-time injection','VOD content injection','content cache','network puli'modules of the system,it guarantees the details and integrity of the program.The system has been deployed to run after several debugging.The system has been deployed on the provincial central platform and the caching nodes have been deployed in various cities.The second-level deployment architecture of "provincial center + municipal node" has been realized.The CDN system is deployed on CL+CG+VSS,it can support the actual concurrent flow of 200,000(9Mbps),meets the actual demand of users,improves the security and scalability of the system.It achieve the original business goals of the system and system capacity requirements,the system improves the transmission speed and quality of video streaming in a province,it also enrich the interactive TV content of broadcasting and TV network.