A Realistic Approach to Analyzing Performance of the Ethernet based on the Space-Time Model

K.Y. Lee, S. Shah, J. Bredeson
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Abstract

A very popular access control method for local area networks having the bus topology is the carrier sense multiple access with collision detection (CSMA/CD) protocol because of its simplicity. This protocol can provide high throughput if the signal propagation time plus carrier detection delay is much smaller than the packet transmission time. Therefore, it is very crutial for performance analysis to consider both the exact timing of a sequence of the events at individual stations and their positions on the network. A study of the CSMA/CD protocol on the basis of space-time model which describes not only times of events but also spatial location is analyzed. A simulation study of the Ethernet operation is presented. First, the throughput of the protocol are monitored at the several different observation points on the bus. Second, the effect of packet length is examined. Then these realistic simulation results based on the space-time model are compared to previous time domain results. These results show that the throughput is much higher than time domain results.
基于时空模型的以太网性能分析方法
一种非常流行的总线拓扑局域网访问控制方法是载波感知多址与碰撞检测(CSMA/CD)协议,因为它的简单。如果信号的传播时间加上载波检测延迟远远小于数据包的传输时间,则该协议可以提供高吞吐量。因此,对于性能分析来说,考虑各个站点一系列事件的准确时间和它们在网络上的位置是非常重要的。分析了基于时空模型的CSMA/CD协议,该模型不仅描述了事件发生的时间,而且还描述了空间位置。对以太网的运行进行了仿真研究。首先,在总线上的几个不同观测点上监测协议的吞吐量。其次,对数据包长度的影响进行了分析。然后将基于时空模型的仿真结果与之前的时域仿真结果进行比较。这些结果表明,吞吐量远远高于时域结果。
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