Gpon ONT F673A V9 4ge+dual wifi+usb+voice english software onu is a ITY-T G.984 compliant device that receives voice, data and video from optical signals in a service provider’s passive optical network and transmits it to residential and commercial formats in a corresponding format. Among users. The upstream traffic is transmitted to the PON network through the optical fiber in the same manner. A single fiber can carry both upstream and downstream traffic