文中分析了AFDX级联网络中数据传输时间延迟的不确定性问题及造成该问题的内在原因，对传输时延的组成部分和影响因素进行描述，指出应用AFDX网络技术应先充分验证端到端时延上界值是否符合系统容限要求。介绍了计算时延上界值的网络演算方法的基本原理及其利用对虚拟链路进行分组优化的算法理论，将该算法应用到某实验环境中的AFDX级联网络配置实例中，计算出实例中各数据流的时延上界并对计算结果的悲观性进行分析，最后得出优化后的算法来分析传输时延更能趋近实际的上界值。%The indeterminacy issue of the AFDX cascade network frame transmission delay and the underlying cause of the problem are analyzed. Composing of the end-to-end transmission delay and the influencing factors are described,pointed out that before the applica-tion of the AFDX network technology the end-to-end transmission delay should be fully validated,whether the upper bound of the delay is complied with the requirements of the system tolerance. The method to calculate the delay upper bound values namely the network cal-culation method with the corresponding optimizations using of virtual links grouping theory are introduced. The algorithm is applied to a AFDX cascade network instance of a test environment,calculated delay upper bounds of the frame streams in configuration instance are compared and analyzed,the pessimistic of results are analyzed,finally the analysis of the frame transmission delay with the group-opti-mized algorithm will be a better approach to get the actual upper bound value.
展开▼
