Check the power to your ONT by observing the LED indicators on your optical network terminal. A green light usually means normal operation, while red or blinking lights signal issues. The tables in this article provide detailed information about the possible appearances of the LED lights on each device, the possible causes of each state, and what you should do. As with any technological system, fiber optic networks may encounter issues that can lead to signal loss, high bit error rates, or other performance problems. Therefore, being able to identify and fix these issues is paramount in ensuring the longevity and efficiency of the network. If the internet light on your TP-Link router is off, or the web interface shows "WAN Port Unplugged" or "Something Is Wrong with the Hardware Connection," this guide walks you through diagnosing and fixing the problem. Note: If other LEDs on your router are also malfunctioning, refer to What should. Many fiber internet problems come from dirty connectors or loose plugs, not major faults.
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