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本文推导出了ＳＤＨ／ＡＴＭ双向自愈环在链路失效、节点失效及链路节点混合失效三种模型情况下的网络生存性函数，从导出的网络生存性函数可以方便地求出生存率的均值、最坏生存率、ｒ百分比生存率及零生存率等单个生存性测度．同时对导出的生存性函数结果进行了分析，结果表明本文的分析方法符合实际情况，是切实可行的，为分析和设计高生存性通信网络提出了统一的可实现的方法．
This paper deduces the network survivability function of SDH / ATM bi-directional self-healing ring in the condition of link failure, node failure and link node failure. From the derived network survivability function, the survival rate can be easily calculated Mean, worst survival rate, r% survival rate and zero survival rate of single survival measures. The results of the derived survivability function are also analyzed. The results show that the analysis method in this paper is in line with the actual situation and is feasible. A uniform and feasible method is proposed for the analysis and design of the high survivability communication network.