Research Of Switch Based On Buffered Crossbar

The service-driven property of network technology development has been agreed on, and constructing new network architecture is becoming the hotspot of the research. The new network architecture requires the switches or routers with more efforts: First, they should be equipped with large number of ports and high speed rate, which can be convenient for supporting large scale number of users. Second, they should be able to support multicast, which can be used for carrying broadband multimedia network traffic with dynamic multicast characteristic. Third, they should support good quality of service, which can make the transition of real-time multimedia traffic from application level to carrier grade smoothly.There are two aspects of switching architecture from the broad sense, that is switching architecture and scheduling algorithm, which performance can affect directly or even determine the performance of the routing switching devices. The more requirements of routing switching devices, the more challenges switching architecture face. However, there exist difficulties in technology because it can not satisfy both the good performance and practical realization in engineering. From analysis of switching architecture, time division multiplexing technology requires higher bus rate and memory access rate, which has an influence on the realization of switching technology on the high speed environment. From analysis of scheduling algorithm, it is too complex for the engineering realization of integrated scheduling mechanism to provide multicast support and quality of service. By introducing cross buffer, buffered cross bar can predigest the control mechanism of switching unit from traditional centralization to distributing asynchronism. It can dramatically deduces the complexity of realization and provide the better platform for the improvement of integrated performance of routing switching devices.With the recent research in "High Performance Broadband Information Networks" Demonstration Project (3Tnet), "Access Convergence Router" and "Military Next Generation Network" supported by the "The Tenth Five Year Plan" of Major Program of the National Natural Science Foundation of China, our dissertation is playing more emphasis on the research of the problems as how to achieve extensibility, how to support multicast traffic, and how to guarantee quality of service for today's switching technology. Finally, an integrated blue print is proposed to guide the design of switching architecture and scheduling policies. Additionally, in order to meet the special requirements of "Military Next Generation Network" to QoS, a novel switching scheduling policy and its implementation is proposed to support DiffServ model. The main work and contributions in this paper are outlined as follows:The evaluation measurements of switching technology can be categorized into theory analysis and simulation experiments. Generally speaking, theoretical analysis is too difficult to get valuable results for the increasing complex system mode. It only provides qualitative analysis and sketchy appraisal. In oppose, previous simulation experiments can't support different...