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通过ABR业务同CBR、VBR和UBR业务比较、描述了它的本质特性，然后分析讨论目前适用于ABR业务的几种基于速率控制、闭环反馈形式的拥塞控制机制。
By comparing ABR services with CBR, VBR and UBR services, it describes its essential characteristics, and then analyzes and discusses several congestion control mechanisms based on rate control and closed-loop feedback currently applied to ABR services.