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About your ONT Power Supply Unit (OPSU) About your ONT Power Supply Unit (OPSU) Your ONT requires electricity to operate all Verizon services provided on the Verizon FiOS network. The OPSU supplies that power by connecting your ONT directly to an electrical outlet at your location.
The OPSU contains a single indicator light that tells you if electrical power is present. If the indicator light is dark, electricity is not flowing from the outlet to the ONT. During normal operation, the light should be green.
The ONT requires very little power to operate. In fact, the amount of power needed is as little as what it would take to operate a couple of night-lights.