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本文提出一种级联排队模型对两路合用系统进行了系统建模，并且利用矩阵几何解析法对该模型进行精确的理论分析，推导出分组平均延迟时间和两条链路的平均利用率这两个重要的性能指标．利用计算结果，着重讨论了两条链路的速率差异、同步缓冲器的长度、系统归一化到达率以及到达过程的突发性对于系统性能指标的影响．
In this paper, a cascade queuing model is proposed to model a two-way combined system. The matrix theory is used to analyze the model accurately. The average packet delay and the average utilization of the two links are deduced Two important performance indicators. The calculation results mainly focus on the influence of the rate difference of the two links, the length of the synchronization buffer, the normalized arrival rate of the system and the suddenness of the arriving process on the system performance index.