If the Alarm light is red, it's likely that the ONT has detected an error or fault. Restart the ONT to see if the issue resolves itself. 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. HBAs have LEDs that you can check to learn whether the adapter has power, whether a link is established, or whether an error has occurred. All. The Port 1 and Port 2 LED status indications vary depending on the operating protocol mode of the universal HBA (see Determining and Changing the Current Operating Protocol Mode): Figure 7, Table 7, Universal Host Bus Adapter Port LEDs for CNA Mode summarizes the LED status indications for CNA. You can use the status lights on your optical network terminal (ONT) to help find and fix internet issues. An ONT may also be called a Service box. You should: Make sure the network power cable is.
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