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
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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