On most models, a solid Green or White light indicates that the router is connected to the Internet. You can solve most of these problems by reconnecting the cables, upgrading firmware, and ensuring that you have an active Internet. What does that blinking light on your modem or router mean? This guide covers every LED color and pattern across Xfinity, Spectrum, AT&T, and CenturyLink gateways, with step-by-step fixes for the most common issues. POWER Normal: Solid/stagnant light. If OFF: The router is not powered — check the socket, adapter, or power cable. PON (Passive Optical Network) Normal: Solid. Learn what each light on your fiber equipment means—from power and fiber signal to Ethernet and phone service—and how to quickly troubleshoot issues. This light shows whether your ONT is getting power. No Light: The ONT is not receiving. Router status lights, often referred to as LED indicators, are small lights on the front panel of your router.
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