Switch Performance Analysis Based On Audio And Video Services

In recent years, single voice services have been unable to meet the needs of users for communication with the development of the internet technology, it has been replaced by multimedia communications and other integrated services. Multimedia services are mainly reflected in the real-time streaming of audio and video data and network file downloads. These applications require higher network bandwidth and have stringent standards for the transmission performance of networks.Based on the transmission characteristics of multimedia services, IEEE802.1AVB (Audio/Video Bridging Task Group) developed the IEEE Std802.1BATM-2011standard. Through the extensions to the existing Ethernet function, it can establish an Ethernet networks with high quality, low delay and time synchronization. This Ethernet networks can also provide a good service quality for audio, video and multimedia applications. For the IEEE Std802.1BATM-2011standard, there are some theory studies and simulation works according to this standard, but in the area of the traditional Ethernet extension and the multimedia business flow forwarding mechanism, the simulation and analysis work has not been carried out. Therefore, this article will focus on the voice and video forwarding technology.The author firstly introduces the traditional bridge and switch forward principle and strategy, combining with the existing forward Ethernet technology, the author identifies the thought for audio and video transmission system with the integration of traditional switching technology and audio video switching technology. Meanwhile, the author plans and designs the suitable video and audio frame format for the forwarding technology.Secondly, because of the Ethernet was originally designed to handle the only pure static non-real-time data and to ensure its reliability, whether the packets arrive out of order and if the service has strict requirement for delay and jitter are not as important considerations. But for the real-time services, they are the key factors which can affect the quality of services. In this regard, by analyzing the requirements of different business flow on the QoS, the author uses the services flow segmentation strategy to map the traffic flow with priority according to their characteristic. At the same time, to each traffic flow, takes resources reserve for each service. Through this method, the quality of service has a guarantee, it can also improve the network performance which exists in the traditional switching technology due to the competition for resources between the, multimedia real-time traffic and asynchronous TCP traffic. Then, the author does in-depth study in the composition and domain of the audio and video system, determines the system architecture for audio and video transmission. Based on the service flow segmentation strategy and forwarding technology for audio and video, the author designs an audio and video transmission system through combining the tradition Ethernet equipment the with audio/video switching technology.Finally, the author uses the OPNET network simulation software to simulate the designed audio and video transmission system. The simulation results fully demonstrated the feasibility for the integration of audio video bridging technology with traditional switching technology, it can also improves the effectiveness of the audio and video transmission performance with this system.