When the fiber media converter is operating normally, PWR power indicator must be lit, FX-LINK / ACT fiber link indicator, TX-LINK / ACT network link pilot lights steady or flashing, if the LINK / ACT light does not, you should to check whether the. When the fiber media converter is operating normally, PWR power indicator must be lit, FX-LINK / ACT fiber link indicator, TX-LINK / ACT network link pilot lights steady or flashing, if the LINK / ACT light does not, you should to check whether the. Understanding LED Indicators on a Fiber Router Let's break down what the common LED lights on a fiber router mean and how they behave: 1. POWER Normal: Solid/stagnant light. If OFF: The router is not powered — check the socket, adapter, or power cable. We can judge whether the equipment and network are faulty through the indicator lights. In order to locate the problem, the firmware of the optical. The LEDs on your modem, optical network terminal (ONT), router, or modem/router combo (gateway) are most likely blinking because they're communicating what the device is doing, or there's an error. What does each indicator mean? Does all the indicators light up to indicate that the fiber media converter is working normally? 1000M:Lit when the electrical link speed is 1000Mbps. 100M:Lit when the electrical link speed is. Fiber optics is a technology that utilizes thin strands of glass or plastic, called optical fibers, to transmit data in the form of light pulses.