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建立一个马尔科夫链（Markovchain）模型，以分析ATM适配层类型2（AAL2）规程的信元打包过程。证实信元中话音的打包密度及链路使用效率很大程度上取决于Timer_CU的值。还给出了为达到预计的链路效率计算Timer_CU值的算法，并联系上海地铁的具体情况给出仿真结果。
Establish a Markov chain model to analyze the cell packing process of the ATM Adaptation Layer Type 2 (AAL2) procedure. The packing density of the voice and the efficiency of the link usage in the cell are confirmed to a large extent by the value of Timer_CU. The algorithm of calculating the value of Timer_CU to achieve the expected link efficiency is also given and the simulation results are given according to the specific conditions of the Shanghai Metro.