Simply put, a Router Mode ONU is an all-in-one fiber gateway. It combines the functionality of a fiber optic modem with a powerful wireless router. This means it performs multiple critical tasks in a single, sleek device. The user needs to arrange the indoor network using wireless routers, PLCs. At its core, an OFC (optical fiber cable) carries signals of light to transmit data across the length of the network. Because optical signals are faster and not affected by noise, an FTTH network can deliver endless Fibernet internet over large distances. Therefore, it has abundant bandwidth to. In the world of Fiber-to-the-Home (FTTH) technology, the humble device that brings blazing-fast internet to your doorstep is often called an ONU or ONT.