中文摘要：

对于采用FC（光纤通道）网络的航空电子系统，从FC的基本模型出发，给出了三种具有容错能力的常用拓扑结构：双环结构、双交换机结构和交换机仲裁环组合结构。在基于任务的系统可靠性建模方法之上，提出了系统平均可靠度的概念；并在不针对确定任务集的情况下，提出使用系统平均可靠度来衡量网络系统的可靠度；针对三种容错拓扑结构，分别给出了系统平均可靠度的表达式。最后通过实例计算分析了三种结构系统平均可靠度受通信节点数影响的情况。

英文摘要：

To the avionics of fibre channel （FC） interconnection, based on the basic FC interconnection model, three fault tolerance topologies are given： loop-to-loop, switch-to-switch and switch-loop. On the task based analysis method of system reliability, the concept of system average reliability is proposed; to unknown task muster, the system average reliability is used to weigh the reliability of network systems; to three usual fault tolerance topologies of FC in avionics, the expressions of the system average reliability are given respectively. I,astly, the circumstance which the system average reliability of three topologies is affected by the node number is analyzed by an illustration.