This paper proposed a share - memory switch structure which is adopted into gpon system , and a memory management method based on packet descriptor 本文主要研究共享缓存交换结构在gpon系统中的应用,并设计了一种基于数据包描述符的缓存管理方式。
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The performances of atm switches with different butter queueing model are analyzed in the third part of this paper . we discuss the performances of input queue switch , shared memory switch and output queue switch respectively 第三部分对不同缓冲排队模型的atm交换机的性能进行了分析，分别讨论了输入排队交换机、共享存储排队交换机及输出排队交换机的的性能。
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Among them , the cell input is taken the extended method for input queue switch . the arrival of cells is restricted by threshold in the model of shared memory switch . the arrival and service of cells have geometric distribution in the model of output queue switch 其中输入排队交换机中信元的输入采用扩展方法，共享存储排队交换机中信元的到达受到门限的限制，输出排队交换机中信元的到达和服务时间服从离散分布。
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