If your router light is flashing, this means that the service is initialising or that data is being exchanged (i. 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. No Light: The ONT is not receiving. 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. Ensure your Fiber Jack is connected to the network and the LED lights are connected and working properly before moving. The Optical Network Terminal (ONT) is a crucial device in modern telecommunications, serving as the interface between your home network and the fiber-optic internet connection provided by your Internet Service Provider (ISP). What are Router Status Lights? Router status lights, often referred to as LED indicators, are small lights on the front panel of your router. POWER Normal: Solid/stagnant light.