Turn off the router and disconnect the power cord. Locate the optical network (PON) port on your router. Every ONT is a little different, but the lights are almost always in the same spot. On most models — including the Langzhi L801, L880G, and L881G — you'll find the indicator lights on the front panel, usually with small icons or text labels underneath. Here are the lights you're most likely to see:. This guide will walk you through what the LOS light means, why it blinks red and step-by-step instructions on how to resolve the issue, including resetting your router. What Does the LOS Light Indicate? The LOS light on your router indicates the status of your internet connection to the Internet. 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. POWER Normal: Solid/stagnant light. PON (Passive Optical Network) Normal: Solid. This white box connects to a fibre‑optic cable that runs directly to your property and gives you access to our fibre broadband and voice services.
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