Fiber optic connection to Xiaomi router is not working

Xiaomi routers cannot connect directly to a fiber optic cable; you must use an Optical Network Terminal (ONT) and ensure proper setup and configuration.Step 1: Verify the Fiber SetupFiber optic cables carry light signals that standard routers cannot interpret directly. The fiber line must terminate at an ONT, which converts optical signals into electrical Ethernet signals compatible with your Xiaomi router . Ensure that:The ONT is powered on and its status lights indicate a stable connection.The fiber cable is securely connected to the ONT's optical port, with dust caps removed and connectors clean .Step 2: Connect the Router CorrectlyOnce the ONT is active:Use a standard Ethernet cable to connect the ONT's LAN/Ethernet port to the WAN port on your Xiaomi router .Power on the router and wait for the indicator lights to confirm a successful connection.Step 3: Inspect Hardware and CablesCommon physical issues include:Damaged or bent fiber cables or connectors.Dirty connectors, which can block the light signal. Clean with lint-free wipes and isopropyl alcohol if necessary .Faulty Ethernet cables between the ONT and router.Step 4: Check Router and ONT ConfigurationEnsure the Xiaomi router firmware is up to date to avoid compatibility issues.Verify that the router's WAN settings match your ISP requirements (e.g., PPPoE username/password if required).Reboot both the ONT and router to resolve temporary glitches .Step 5: Advanced TroubleshootingIf the connection still fails:Test the ONT with another router to confirm it is functioning.Use a fiber power meter or OTDR to check for signal loss or breaks in the fiber line .Contact your ISP to verify that the fiber service is active and that the ONT is properly registered on their network.Preventive TipsKeep fiber cables away from sharp bends and high-traffic areas.Regularly inspect and clean connectors.Use surge protectors to prevent power-related failures for both the ONT and router. By following these steps, you can ensure that your Xiaomi router receives a stable Ethernet signal from the ONT, enabling proper fiber optic internet connectivity .