这种机制利用分片产生的流描述信息得到文件的流发送速率等级，在网络拥塞时选择发送较小编码速率的文件数据，从而达到了服务器端控制发送速率的目的。
The article brings forward file level flow control mechanism, this mechanism use stream information layers to choose strip files with less data rate to send when networks is congested.
介绍了EPON与GPON两种技术。并从标准成熟度、支持速率等级和业务能力、传输效率、安全性和可扩展性等几个方面对EPON与GPON进行了比较。
The article introduces EPON and GPON and compares these two technologies in terms of maturity, speed, service capacity, transmission efficiency and scalability.
接收端通过选择合适的服务级别来调整接收速率，服务等级越高则累计接收到的视频层数越多；
The users adjust their reception rate by choosing appropriate service level. The higher the level their apply, the more layers their will receive.
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