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针对航空电子光纤通道网络的实时性问题,建立了光纤通道的网络演算模型,分析了在交换机不同服务策略下系统各类数据流的延迟上界情况,给出了计算在交换机不同服务策略下各类数据流延迟上限的数学方法.分析结果表明与先到先服务(FCFS,FirstCome First Service)服务策略相比,非抢占式静态优先级(NPP,Non-Preemptive Priority)服务策略可以降低高优先级数据的延迟上界,能更好地满足高优先级数据的强实时性要求.通过与仿真结果比较可知,仿真结果与此数学方法的分析结果一致,此方法适于分析系统中各类消息的延迟上界情况,可用于光纤通道网络设计和性能评价.
Aiming at the real-time problem of Avionics Fiber Channel network, this paper establishes a network computation model of Fiber Channel, analyzes the upper bound of delay of various data streams under different service strategies of switches, The mathematical method of the upper limit of class data flow delay is proposed.The analysis results show that non-Preemptive Priority (NPP) service strategy can reduce the priority of high-priority service compared with the First First Service (FCFS) The delay upper bound of data can better meet the strong real-time requirements of high-priority data.Compared with the simulation results, the simulation results are consistent with the analysis results of this mathematical method, which is suitable for analyzing all kinds of messages in the system Delay upper bound can be used for Fiber Channel network design and performance evaluation.