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采用“平均有效终端数”作为可靠性度量参数，根据统计服务理论，对具有环路回接功能的双环容错ＬＡＮ进行了数学解析，建立了可靠性数学模型通过数值分析，考察了网络的可靠特性，分析了实际终端数、源终端的位置与系统可靠性的关系，为双环ＬＡＮ的性能评价、设计和应用提供了理论依据
Based on statistical service theory, the “average effective terminal number” is used as the reliability measurement parameter, and the double loop fault-tolerant LAN with loopback function is mathematically analyzed. The reliability mathematical model is established. By numerical analysis, the reliability of the network Characteristics, and analyzes the relationship between the actual number of terminals, the location of the source terminal and system reliability, and provides a theoretical basis for the performance evaluation, design and application of the dual ring LAN