subject: Content Distribution Network (cdn) In The Application Of Streaming Media Technology - Streaming [print this page] As information technology continues to evolve, the Internet to learn more and more into our life work, it is the flow of information as a new host platform, is profoundly change people's exchange and ways of thinking. As of the end of 2006, the number of Chinese Internet users reached 137 million, representing 10.5% of the total Chinese population, using xDSL, CableModem, green and other broadband Internet users reached 10,400 million, representing 75.9% of the total Internet users, China has entered the broadband era.
With the bandwidth the basis of video technology and related products showed explosive growth trend. 2006, video sites like mushroomed, its interactive rich media content and value-added applications to attract the majority of users. Broadband multimedia value-added service makes full use of its high bandwidth and interactive features to provide users with a variety of effective value-added services, allowing users to feel value for money broadband charges.
Streaming media technology and its applications in broadband multimedia value-added services is an important part. Streaming media technology is a user without waiting for all data downloaded to a local, you can start browsing or play streaming media technology. For streaming media over time the changing features. Clients can use while playing, while receiving data to solve the download time. That is no need to fully download can be played back immediately. Once the client is not all the data from the server to read, but the first line to read the audio or video clips to the first part, in the first part of the first broadcast, while the rest of the data stream to download, play for the client .
Streaming media technology is widely used in multimedia news releases, video broadcast, Internet advertising, e-commerce, video on demand, remote education, telemedicine, Internet radio stations, the content of expressions of their wealth to give more entertainment and broadband applications interactive. In order to reduce delay and ensure the viewing quality, the user must have enough bandwidth resources, and bandwidth resources are also dependent on other controls, such as flow control, congestion control. When the network resources change, the system must be able to adapt to this change and make appropriate adjustments.
Streaming media category business generally is the server to the client or the client to the client's business service architecture, as the audio codec is the server and client of the key functions, as the audio codec requires a lot of server / client software and hardware resources, the current server or client unbearable so much concurrent requests, the following general can only support 1,000 concurrent streams, there are only VIEWGOOD streaming media service platform to support a single server 1000 concurrent streams. Streaming media business, if directly in the current IP Internet operations will produce a series of problems, such as: difficult to guarantee the bandwidth and QoS; broadcast type business the backbone of consuming network bandwidth, and constitutes a significant source of stress. Once the streaming media business users to increase volume and traffic will flow on existing network traffic caused great impact, even making the existing network can not guarantee regular business operations.
These issues within the framework of the existing network is difficult, and streaming media technology providers to actively introduce the content delivery network (CDN) to address these problems.
CDN English full name is Content DeliveryNetwork, the content distribution network. It is a way to build a new network is particularly optimized network coverage layer. From the broad sense, CDN represents a network based on the quality of service model and order. By the user and server load near the judge, CDN ensure that the system in a very efficient way for the users. CDN core include: content routing, content distribution technology, content storage, content management technology.
The following to the CDN product VIEWGOOD example to illustrate.
Content routing technology
CDN load balancing system, the role of the user's action request assigned to the best CDN network nodes. VIEWGOOD CDN technology products, a variety of strategies based on selected best node, for example, the nearest nodes so the lightest load. Load-balancing system is the core of the CDN, load balancing accuracy and efficiency of the entire CDN directly determine the efficiency and performance.
