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How to check the speed of broadband fiber optic routers

ODN and passive infrastructure knowledge brief Published 14 Feb 2025

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

To accurately check your fiber optic internet speed, use a wired Ethernet connection to your router or ONT and run a speed test while minimizing background network activity.Steps to Test Your Router Speed

1. Use a Wired Connection: For the most accurate results, connect your computer directly to your router or Optical Network Terminal (ONT) using a Cat5e or Cat6 Ethernet cable. Wi-Fi can significantly reduce speed due to interference, distance, or router limitations . 2. Close Background Applications: Pause cloud backups, streaming services, and software updates. These consume bandwidth and can skew your speed test results . 3. Check Hardware Compatibility: Ensure your router, Ethernet adapter, and cable support gigabit speeds. Older routers or Cat5 cables may cap speeds at 100 Mbps, limiting your test results . 4. Run a Speed Test: Use reliable online tools such as Speedtest by Ookla, Google Fiber Speed Test, or TestMySpeed.com. These measure download speed, upload speed, ping (latency), and jitter . For fiber, symmetrical speeds (equal upload and download) are expected. 5. Test Multiple Times: Run the test at different times of day to check for consistency. Continuous monitoring for 5+ minutes can reveal fluctuations or stability issues . 6. Compare Wired vs. Wi-Fi: If your wired speed matches your fiber plan but Wi-Fi is slower, the bottleneck is likely your wireless setup, not the fiber connection . 7. Use Router Apps if Available: Some routers, like GFiber routers, offer built-in speed tests via their app. You can test speed to your home (from ISP to router) and speed to your device (router to device) for a complete picture .

Additional Tips
  • Update Firmware: Ensure your router firmware is up to date for optimal performance.
  • Restart Equipment: Occasionally reboot your router or ONT to resolve temporary slowdowns.
  • Upgrade Hardware: For multi-gig fiber plans, a router with a Gigabit WAN port and Wi-Fi 6 or newer is recommended . By following these steps, you can accurately measure your fiber optic internet speed and determine if your router is performing at its full potential.

How to check the speed of broadband fiber optic routers - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

How to check the speed of broadband fiber optic routers

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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