摘要
交换式以太网在网络控制系统中的应用关键问题是实时能力,为此采用一种新型实时性能分析工具——网络演算,对交换式以太网实时能力进行确定性的分析和研究。针对FIFO调度算法,对两级树型拓扑结构的交换式以太网系统建立了通信模型,推导出各网络元素的到达曲线和服务曲线,由此得到了最大时延、所需缓冲区大小、输出突发量等实时业务流的主要参数解析表达式;利用推导所得结论计算了实时业务流的最大网络时延。
The focus that switched Ethemet is applied in the networked control system is ability of real-time.For this,a new ana- lytic tool：network calculus is used to detennlnately analyze the special performances of the real-time data via a switched Ethernet.With scheduling algorithms FIFO （First Input First Output）,the communication model is set up and network elements＇ arrive curves and service curves are derived for a switched industrial Ethernet model with two levels＇ tree topology.Then,analytic expressions of the worst case end-to-end delay,buffer size and output burstiness are presented,the maximum network delays of real-time data are calculated based on derived results.
出处
《计算机工程与应用》
CSCD
北大核心
2008年第1期21-24,共4页
Computer Engineering and Applications
基金
国家自然科学基金(the National Natural Science Foundation of China under Grant No.60773190
No.60704035)
高等院校博士学科点专项科研基金(the China Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20020487023)。
关键词
网络演算
交换式以太网
时延上界
network calculus
switched Ethernet
worst case delay bound
