中文摘要：

针对环网的不足,提出双环平行网络,并分析双环平行网络的时延和可靠性。使用图论知识表示双环平行网络的拓扑结构,在此基础上分析其直径、平均距离、连通度和容错性等性能参数。双环平行网络的直径和平均距离约为环网的一半,其传输时延也约为环网的一半。双环平行网络的连通度和边连通度比环网大1,其可靠性远远高于环网。实验结果表明,环网与双环平行网络的时延之比为1.90∶1,验证了双环平行网络的传输时延约为环网一半的结论。

英文摘要：

Aiming at the shortcoming of ring network,dual-ring parallel network is proposed and its propagation delay and reliability are analyzed in this paper.Graph theory is used to describe the topology of dual-ring parallel network,and the diameter,mean distance,connectivity and fault tolerance of dual-ring parallel network are analyzed respectively.The diameter and mean distance of dual-ring parallel network equal to the half of those of ring network approximately;the propagation delay of dual-ring parallel network equals to the half of that of ring network approximately too.The connectivity and edge-connectivity of dual-ring parallel network are greater than those of ring network by one time;therefore,dual-ring parallel network is much more reliable.Experiment results show that the propagation delay ratio of ring network to dual-ring parallel network is 1.90∶ 1,which verifies the above conclusion.