高速动车组车载以太网时延分析

Analysis of Delay in High-speed Electric Multiple Units Vehicle-Mounted Ethernet

车载以太网技术已经逐渐应用在高速动车组通信网络,网络时延是影响通信网络质量的一个重要因素;文章分析了不同网络拓扑结构对网络时延的影响,并运用网络仿真软件(OPNET)构建基于车载以太网的高速动车组通信网络模型;通过分析仿真数据来分析总线型网络拓扑和环型网络拓扑的网络时延、链路负载、点对点吞吐量;结果表明,通过合理设置网络参数,环型网络拓扑结构优于总线型网络;研究结果为优化车载网络拓扑结构提供了技术参考。

The vehicle--mounted Ethernet technology has been applied gradually in high--speed EMU communication network, and the network delay is one of main indexes in measuring network performance. The paper analyzes the impact of the different network topology on network delay, and the High--speed EMU vehicle--mounted Ethernet communication network model is built up based on OPNETo By analyzing the simulation data, it compares the Ethernet delay, load and point--to--point throughput of the ring network topology and the bus network topology. The simulation results indicate that the ring network is superior to the bus network topology. The conclusions could provide the technological reference for optimizing vehicle--mounted network topology.