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为了研究光纤通信系统无中断工作的能力 ,计算通信系统可用度具有重要的意义。在 ITU- T G.911光通信系统可用度计算的基本原则下 ,建立了系统状态的 Markov模型和状态转移概率矩阵 ,并利用稳态 Markov模型中状态转移概率平衡的特点求解稳态概率。再利用网络拓扑结构和保护机制的信息 ,通过简单的概率运算得到系统的稳态可用度。在这种计算方法的基础上分析了 SDH的自愈保护机制以及各种故障对系统可用性的影响。在计算结果的指导下 ,可以知道为了达到特定的可用度 ,通信设备和光纤必须具备的正常工作时间和出现故障后的最长修复时间
In order to study the ability of the optical fiber communication system to work without interruption, it is of great significance to calculate the availability of the communication system. Under the basic principle of ITU-T G.911 optical system availability calculation, Markov model and state transition probability matrix of system state are established, and the steady-state probability is solved by using the characteristics of state transition probability balance in steady-state Markov model. Reuse the information of network topology and protection mechanism to get the steady state availability of the system through simple probability operation. Based on this calculation method, the self-healing protection mechanism of SDH and the impact of various failures on system availability are analyzed. Under the guidance of the calculation results, it is known that in order to achieve a specific availability, the communication equipment and the optical fiber must have the normal working hours and the longest repair time after the failure