No internet connection when connecting the fiber optic box to the router

No internet when connecting your fiber optic box to the router is often caused by physical connection issues, incorrect configuration, or ONT/router malfunctions.

Check Physical Connections

Ensure the fiber optic cable is properly connected to the ONT (Optical Network Terminal) and that the Ethernet cable links the ONT's LAN port to the router's WAN port. Inspect cables for visible damage, sharp bends, or loose connectors, and replace any compromised cables . Clean the connectors with lint-free wipes and isopropyl alcohol if necessary .

Verify Indicator Lights

Check the ONT LEDs:

• Power LED: Must be on.
• PON/Optical LED: Should be green; if off, the fiber signal may be missing.
• Data/Internet LED: Indicates connection to your router; if off, check the Ethernet cable or router port . Router LEDs should indicate a valid WAN connection. If the router shows an IP address of 0.0.0.0, the issue is likely with the ONT or physical setup .

Restart and Reset Devices

Power cycle the ONT first, then the router. Wait a few minutes for the devices to re-establish a connection . If problems persist, consider resetting the ONT following the manufacturer's instructions, ensuring all devices are disconnected and settings are backed up .

Check Configuration and Firmware

• Ensure the router is configured to obtain an IP automatically from the ONT or use the correct static IP if required by your ISP .
• Update firmware on both the router and ONT to avoid compatibility issues .
• Verify that your router's LAN IP does not conflict with other devices and that DNS settings are correct .

Additional Steps

• Test with a different Ethernet cable to rule out cable faults .
• Confirm there is no service outage in your area by checking your ISP's website or app .
• If using a new router, ensure it supports fiber connections and the correct WAN type (SFP or Ethernet WAN), . Following these steps usually resolves connectivity issues between a fiber optic box and a router. If the problem persists, contact your ISP for further assistance, as the issue may be with the fiber line or ONT provisioning.