A properly functioning fiber optic router should show a steady green LOS light, stable internet connectivity, and consistent network performance.

Key Indicators of Proper Operation

1. LOS (Loss of Signal) Light: On most fiber routers, a steady green LOS light indicates a good connection to your ISP. If the LOS light is blinking or red, it signals a problem such as a damaged fiber cable, loose connection, or service outage .
2. Power and Connectivity LEDs: Ensure the power light is on and LAN/Wi-Fi indicators are active. These lights confirm that the router is powered and transmitting data to connected devices .
3. Internet Performance: Test your internet speed and stability. A properly working fiber router should deliver speeds close to your plan's advertised rates with minimal latency or packet loss .

Basic Checks and Troubleshooting

• Inspect Fiber Cables: Look for visible damage, sharp bends, or loose connectors. Fiber cables are sensitive, and even minor bends can affect signal quality .
• Clean Connectors: Dust or oil on connectors can degrade performance. Use lint-free wipes and isopropyl alcohol to clean them .
• Restart Devices: Power cycle your router and any connected ONT (Optical Network Terminal) to resolve temporary glitches .
• Check Transceivers: If your router uses removable transceivers, swapping them with known-good units can help identify hardware issues .

Advanced Verification

• Signal Strength Testing: Use an optical power meter or OTDR to measure signal loss. Values outside the typical range of -15 dBm to -30 dBm may indicate a problem .
• Network Diagnostics: Run ping tests or check your router's status page to ensure all interfaces are active and no errors are reported . By following these steps, you can confirm that your fiber optic router is functioning correctly and maintain optimal network performance. Regular inspection and maintenance of cables and connectors help prevent future connectivity issues .