ATM网络中业务量管理的主要作用是防止网络和端系统拥塞以便获得网络性能目标。
A primary role of traffic management in ATM networks is to protect the network and the end-system from congestion in order to achieve network performance objectives.
但在拥塞发生在信源处或对突发性业务进行控制的情况下，添加开环控制的ABR拥塞控制可以获得比闭环控制更佳的作用。
However, in case the connection is source bottlenecked or the service is burst, ABR congest control plus open loop control can do a better job than close loop control.
从运营的情况来看，这套CDN系统对于提高流媒体的服务质量，降低骨干网络拥塞的作用非常明显。
According to running CDN network experience, it can improve service quality for stream media and reduce bandwidth requirement for backbone network remarkably.
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