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研究了呼叫级无阻塞的多级ＡＴＭ交换网络．在ＡＴＭ交换中，无阻塞交换网络所需内部通路的多少与呼叫业务的速率、连接允许控制方法及业务的服务质量需求等因素有关．文中用链路的分配函数表征这些因素的作用，给出了双边和单边多级Ｃｌｏｓ交换网络对给定类型的呼叫业务的无阻塞条件．该结论包含了线路交换和多速率线路交换中已有的无阻塞条件，是对传统多级交换网无阻塞研究的发展
The call level non-blocking multi-level ATM switching network is studied. In ATM switching, the number of internal paths required for a non-blocking switching network is related to the speed of the calling service, the connection control method allowed, and the service quality requirements of the service. In this paper, the role of these factors is characterized by the allocation function of the link, and the non-blocking conditions for a given type of call service are given for the bilateral and unilateral multistage Clos switching networks. This conclusion includes the existing non-blocking conditions in line switching and multi-rate line switching, and is the development of non-blocking research on the traditional multi-level switching network