东南大学学报（自然科学版）2012，Vol.42Issue(z2)：233-237,5.DOI:10.3969/j.issn.1001-0505.2012.S2.002
EPA网络跨网段延迟数学模型
A mathematical model of delay across segments in EPA network
摘要
Abstract
In order to realize the real-time transmission between two ends across segments in the EPA (Ethernet for plant automation) network, a mathematical model that formulates the delay across segments is constructed. A communication link model across segments in the EPA network is given according to the standard of EPA, in which the EPA bridge is a key device. Based on the analysis of the data transmission across segments in the EPA network and the EPA bridge process, several important factors that influence delay are derived, including: the numbers of segments, the transmission distance, the processing capacity of the bridge, the scheduling algorithms in segments, the difference of the time-basis between segments, the variation of the load in a node and the transmission speed of the EPA network. Certainty factors such as number, distance, speed, the difference of the time-basis are represented as independent variables while the uncertainty factors such as capacity, algorithm and variation, the change range of which are found by calculation, are represented as quo-tiety. Consequently, a mathematical model of the end-to-end data transmission delay across segments is proposed. This model can be utilized to analyze the controllability and importance of each factor. And this work provides the theoretical basis for the realization of real-time transmission of data across segments in the EPA network.关键词
EPA网络/跨网段/端到端延迟/调度因子Key words
EPA network/ across segments/ end to end delay/ scheduling factor分类
信息技术与安全科学引用本文复制引用
姜秀柱,包向阳,李向东,原徐成..EPA网络跨网段延迟数学模型[J].东南大学学报（自然科学版）,2012,42(z2):233-237,5.基金项目
江苏省质量技术监督局资助项目(2012QK178)、中国矿业大学横向科研资助项目(7D128670). （2012QK178）
