题目详情

在网络数据传输过程中都是收、发双向进行的。一般来说,对于光纤介质也就需要两条光纤分别负责数据的发送和接收。近年来已经有了在单条光纤上同时传输收发数据的技术,下面支持单条光纤上同时传输收发数据的技术是(  )。

  • A.WiFi和WiMAX
  • B.ADSL和VDSL
  • C.PPPoE和802.1x
  • D.GPON和EPON

正确答案及解析

正确答案
D
解析

本题考查PON技术的知识。

PON的复杂性在于信号处理技术。在下行方向上,交换机发出的信号是广播式发给所有的用户。在上行方向上,各ONU(光网络单元)必须采用某种多址接入协议如时分多路访问TDMA(TimeDivisionMultipleAccess)协议才能完成共享传输通道信息访问。目前用于宽带接入的PON技术主要有:EPON和GPON。

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