Nowadays, EPON systems usually adopt the design of upstream and downstream to transfer data, audio and IP digital video.
目前，EPON系统普遍采用的是两个波长的上下行链路设计，用来传送数据、语音和IP数字视频。
Nowadays, EPON systems usually adopt the design of upstream and downstream to transfer data, audio and IP digital video.
目前，EPON系统普遍采用的是两个波长的上下行链路设计，用来传送数据、语音和IP数字视频。
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