If the ONT is off or having startup issues, you can't connect to the internet. However, the Data LED is specific to your home network, so if the LED is off, check the Ethernet cable or the. Previous owner/ISP seems to have unhooked all coax cables from a splitter and directly connected to the single cable that runs to the modem. When I took this apart, put a splitter between the two, and only plugged in ONE additional coax cable, my internet cut out. They work by physically. They are used to split one network signal into multiple signals. Why Do Fiber Networks Fail? Despite their robustness, fiber networks can fail due to:. Optical cables, often referred to as fiber optic cables, have become integral to our everyday lives, delivering high-speed internet and crystal-clear audio and visual signals. Here's an example of LEDs to look for if you have fiber internet and an ONT: The Power LED.
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