What does it mean when the router s fiber optic cable emits a bright blue light
Because manufacturers treat blue differently, it's worth checking the device. The LOS light on your router indicates the status of your internet connection to the Internet Service Provider (ISP). However, when it blinks red or stays solid red, it signifies a Loss of Signal, a problem preventing your router from communicating. 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. 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.
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