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Battery Backup Unit (BBU):
Continuous power when you need it
In case your ONT Power Supply Unit is accidentally
unplugged — or in the event of a commercial power
failure — a backup battery has been installed to
provide you with power for voice service for
approximately four hours. Your BBU was installed
in a location in your home or garage where it
can be easily monitored — most likely near the
OPSU. The BBU is connected directly to the
ONT to provide backup power if it’s needed. In
addition, the BBU contains a series of indicator
lights that tell you whether your service is being
powered by your home’s electricity or the battery.
The BBU also tells you when the battery needs replacing. The average
life of your battery is between one and four years, depending on the
average temperature of the environment. When your battery does
need replacing, you can purchase a sealed lead-acid battery at major
electronics outlets and home improvement stores.
BBU Indicator Lights:
The meaning behind the signals
Your BBU has four distinct lights to signify certain conditions, as
described below. Please take a moment to review them.
System:
Green — Operating normally.
Blinking Green — Battery is going through a self-test.
Yellow — ONT is operating from the battery and the battery is
discharging.
Blinking Red — Battery is fully discharged and needs to be replaced.
Please note: Battery disposal standards and requirements vary by state. If you
need to replace the sealed lead-acid battery in your Battery Backup Unit, please
check the following Environmental Protection Agency resources for proper
disposal instructions: visit www.epa.gov/epr/products/batteries.html or call the
EPA directly at 1-800-424-9346.