Router fiber optic connection not connected

If your router cannot connect to a fiber optic network, the issue often lies in the ONT setup, cable integrity, or router configuration.Check the Physical ConnectionsFiber optic cables are sensitive and cannot connect directly to standard routers. Ensure the fiber line is properly connected to the Optical Network Terminal (ONT) provided by your ISP, which converts light signals into electrical signals your router can use . Inspect the fiber cable for visible damage, sharp bends, or loose connectors, and clean the connectors with lint-free wipes and isopropyl alcohol to remove dust or oil .Verify ONT and Router SetupPower on the ONT and wait for the status lights to stabilize (usually 2–5 minutes), .Connect the ONT to your router using a high-quality Ethernet cable (Cat6a or higher) from the ONT's Ethernet/LAN port to the router's WAN port .Ensure your router is fiber-ready and supports gigabit speeds or higher. Some routers have specialized SFP or WAN ports labeled for fiber input .Check Device Indicators and ConfigurationLook for LOS (Loss of Signal) or error LEDs on the ONT or router, which indicate connectivity issues .Restart both the ONT and router to resolve temporary glitches .Access your router's configuration interface (typically 192.168.0.1 or 192.168.1.1) to verify WAN settings, IP assignment, and Quality of Service (QoS) if needed .Test Signal and HardwareIf the connection still fails:Use a fiber power meter or OTDR to measure signal strength; values outside -15dBm to -30dBm may indicate a problem .Swap suspect transceivers or Ethernet cables with known-good units to rule out hardware failure .Environmental and External FactorsEnsure the ONT and router are in a dry, temperature-stable environment. Moisture or extreme temperatures can affect fiber performance .If the fiber line was recently installed or repaired, confirm there are no cuts or bends along the route .When to Contact Your ISPIf all steps fail, the issue may be with the fiber service itself or the ONT. Contact your ISP for technical support, as they can test the line remotely and replace faulty equipment . By systematically checking cables, ONT setup, router configuration, and signal integrity, most fiber-to-router connectivity issues can be resolved efficiently.