Only the fiber optic light is on on the router

If only the fiber optic (PON) light is on, it indicates that the router is receiving a proper fiber signal but may not be connected to the internet or local devices.What the Fiber Light MeansThe fiber optic or PON (Passive Optical Network) light being solid typically shows that the router is receiving a proper optical signal from your ISP's fiber network . This confirms that the physical fiber connection is intact and the router is powered.Why Other Lights May Be OffLAN/Ethernet Lights: If these are off, it usually means no devices are connected via Ethernet, or the cable/port may be faulty .Internet/WAN Light: If this light is off, the router may not be establishing a connection with the ISP, even though the fiber signal is present .Wi-Fi Light: If off, the wireless network may be disabled in the router settings .Troubleshooting StepsCheck Connections: Ensure all Ethernet cables are securely connected between the router and devices or the ONT (Optical Network Terminal) .Restart Devices: Power cycle both the router and the ONT to reset the connection .Inspect Hardware: Look for damaged cables, dirty connectors, or faulty ports .Check ISP Status: Log into your ISP account or contact support to verify there are no outages or service issues .Router Settings: Confirm that Wi-Fi is enabled and that the router is configured correctly for your ISP .When to Contact SupportIf the fiber light is solid but other lights remain off after checking connections and restarting devices, the issue may be with the router itself, the ONT, or the ISP network . Contacting your ISP or router manufacturer for further diagnostics is recommended.