While fiber internet doesn't require a modem, you still need a router to distribute the connection across your network. Your router works hand-in-hand with the ONT, taking the internet signal and spreading it wirelessly or through Ethernet cables to all your connected devices. Your ONT handles signal conversion, eliminating the need for a traditional modem altogether. Think of the ONT as a high-tech bridge between your ISP and your internal network – but engineered specifically for fiber's unique data. If you are wondering can you use any router for internet, the answer is not always. Routers designed for DSL (which uses phone line. The answer is actually no—fiber optic equipment differs significantly from cable setups.