ASON can be constructed using the streaming media network operating platform-ASON, streaming media,
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ASON was a streaming media delivery provides a good platform for optical fiber transmission medium, the introduction of WDM (Wavelength Division Multiplexing) technologies, to meet the huge bandwidth requirements, the optical characteristics of the exchange can be reduced delay, packet loss and other effects.
Build using ASON network platform for streaming media is the future direction of development.I. Introduction With the current video on demand, Internet TV and other multimedia services continue to heat up, the major network operators have to turn their attention streaming media services market. Now streaming media has increasingly become a mainstream broadband network business, and streaming media data with the “bandwidth of the exclusive”, “large-scale concurrency” and “smooth flow” of such characteristics and a higher network performance requirements on the existing network technology system also made a great challenge, therefore, how to make full use of existing network resources, with minimum investment for maximum economic returns? How to solve the real-time media stream data quality problems caused by network service? Be deployed in the system operators face the greatest difficulties.
At the technical level, the streaming media business and technology system involving many different technologies, read materials on a wide range of distribution from the content store to exchange technology, electronic program navigation (EPG) technology, bearer network technology, codec technology, safety encryption technology, signaling and so on. From the perspective of the bearer network streaming media business present challenges. Streaming media service for the high QoS requirements, including bandwidth, latency, packet loss, the traditional IP network more difficult to carry this business. ASON was a streaming media delivery provides a good platform for optical fiber transmission medium, the introduction of WDM (Wavelength Division Multiplexing) technologies, to meet the huge bandwidth requirements, the optical characteristics of the exchange can reduce the delay, the impact of packet loss, etc.. Construction using ASON network platform for streaming media is the future direction of development. This article discusses the use of ASON network building model for streaming media, and the key technologies required.
2, streaming media service features and the use of ASON network pattern analysisStreaming media service is the streaming technology used by the network transmission media remote information, the client computer without downloading the entire video file to a local, he may watch, listen to a real-time business. It has a large-scale concurrency, real-time and sudden large flows, this capacity of existing networks and structures will form a major challenge. Common Application streaming video on demand mainly (VOD), Video Broadcast, InternetTV, video surveillance, video conferencing, distance learning, interactive games.
Large-scale streaming media service systems generally use the hierarchical architecture: first, the server subsystem, its main role is to run application software, handle all user requests followed by the storage network, its main role is to provide effective data throughput, security system can simultaneously transmit a large number of concurrent media streams third storage system, its main role is to provide a variety of mass storage space for media files the fourth is the data network that is used to connect a variety of server and metro backbone network, making streaming media service system can be circulated to the media sent to the user concurrency.
Internet streaming media applications and services from the network model to analyze the two. The relationship between the two described as follows: streaming media business integration platform running on the network, for broadband network operators, the streaming media business integration platform for the equivalent of central media server broadband network operator platform provides a user access into, and to provide video streaming media services platform, between the user and the business integration platform, its role is a media server for users and provides user access, authentication, and basic data logging functions business integration platform functionality equivalent to one for the storage, transmission media content storage area networks (SAN: StorageAreaNetwork), to provide an electronic program guide (EPG) function, for business services, XML portal. Taking into account the network layer can be divided into CPN, broadband metropolitan area network and trunk network of three, in the deployment of streaming media business, they need to take into account within the business operation of broadband metropolitan area networks, can also be inter-regional route network program delivery, streaming media programs to achieve inter-regional exchanges. All business by the business operators, CPN provides user access, and inter-MAN received, to provide users with multimedia services with QoS guarantees.
ASON technology with the continuous development now, using its fast burst transmission technology and dynamic multicast technology to carry streaming media business has become the industry’s research focus to IP / ASON dual-platform WAN as streaming media business integration platform development trend, shown in Figure 1. This real-time streaming media service providing end to end optical link connections. The current dynamic multicast ASON is still in research stage, which involves multicast ASON UNI interface technology, ASON multicast routing technology, ASON multicast signaling protocol technology. ASON major standards organizations have not yet made a clear definition of the multicast frame. Therefore, IP / ASON network model construction does not have the maturity of the technology conditions. But with the depth of these key technologies and standards, it will be the deployment of next-generation streaming media system one of the best, worthy of close attention of major operators. ASON multicast with conventional multicast IP networks are great differences. ASON control plane is built on the common multi-protocol Label Switching (GMPLS) protocol system, the tag (Label) is the only sign ASON in the business. GMPLS simplified data forwarding process, improved real-time multicast. The Two GMPLS traffic engineering to support the exchange offers, ASON good survivability is an important guarantee for QoS multicast services. These advantages are the “best-effort” IP network match. ASON supports multi-granularity business exchange, so ASON multicast data can be based on wavelength, Ethernet frames or SDH / SONET. Currently the main use of ASON carrying the SDH / SONET service multicast.
IP / ASON dual platform can effectively support real-time services with high QoS requirements. As the business integration platform is built on IP / ASON double-platform WAN, using ASON link layer multicast functionality provided by the CDP through the signaling interface, ASON UNI, the network television programs to achieve end to end connection-based, reliable data transfer. Specific process is as follows: in the media content delivery platform, content distribution from the Content Distribution Manager through the UNI (UserNetworkInterface) agents to send ASON
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