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ＡＴＭ论坛定义了可用比特率（ＡＢＲ）业务作为充分利用ＡＴＭ网络带宽的手段。该类业务主要面向对时延和时延变化率不敏感的数据业务提供支持，所以应保证极低的信元丢失率。为了做到这一点，关键是合理地设计流量控制机制和ＡＴＭ交换机缓存的大小。由于目前的数据业务大多数由计算机产生并具有开／关特征，所以我们对具有开／关特征的ＡＢＲ业务源进行了分析，推导出在多开／关业务源混合作用下ＡＴＭ交换机的极限信元丢失率的计算公式，分析了缓存长度动态变化对ＡＢＲ业务的影响，并针对一个１２端口的ＡＴＭＬＡＮ交换机进行了仿真分析。对于设计具有开／关ＡＢＲ业务的ＡＴＭ交换机的缓存大小，所得出的结论具有指导意义。
The ATM Forum defines the available bit rate (ABR) service as a means to take full advantage of ATM network bandwidth. This type of service is mainly supported by data services that are insensitive to the rate of change of delay and delay, so a very low cell loss rate should be guaranteed. In order to do this, the key is to rationally design the flow control mechanism and the size of the ATM switch cache. Because most of the current data services are generated by computers and have on / off features, we analyze the ABR service source with ON / OFF characteristics and derive the limit letters of ATM switches under multi-ON / OFF service source mix Yuan loss rate calculation formula, analysis of the buffer length dynamic changes on the ABR business impact, and for a 12-port ATMLAN switch simulation analysis. The conclusion drawn for the design of the cache size for an ATM switch with on / off ABR services is instructive.