There is no cursor on the router s fiber optic cable

If your router shows no activity on the fiber optic port, it may be due to missing ONT, incompatible router, or improper connection.

Check for an Optical Network Terminal (ONT)

Most fiber optic connections require an ONT, which converts the light signal from the fiber into an electrical signal your router can use . If your router is connected directly to the fiber cable without an ONT, it may not detect any signal. Verify whether your ISP has provided an ONT and ensure it is powered on and properly connected.

Verify Router Compatibility

Not all routers can accept a direct fiber optic input. Routers must have a fiber-ready port (SFP or WAN port labeled “Fiber” or “ONT”) to interface with the fiber cable . If your router lacks this port, it will not show any connection activity.

Inspect the Fiber Connection

Ensure the fiber cable is properly seated in the ONT or router port. Improper insertion can cause signal loss or no indicator light . Fiber connectors (SC/APC or SC/UPC) must be clean and free of dust. Using a fiber optic microscope or visual fault locator can help identify physical issues with the cable .

Check Ethernet Link Between ONT and Router

Once the fiber is connected to the ONT, an Ethernet cable should link the ONT to the router's WAN port. Without this, the router will not receive the converted signal, and no cursor or activity will appear .

Contact Your ISP

If all hardware is correctly connected and the router still shows no signal, the issue may be on the ISP's end, such as an inactive fiber line or misconfigured service . Your ISP can verify the fiber status and ensure the ONT is properly provisioned. By following these steps—confirming ONT presence, router compatibility, proper fiber connection, and Ethernet link—you can identify why the router shows no activity on the fiber optic cable and take corrective action.