Battery Backup Unit
Your Optical Network Terminal (ONT) is installed with a separate Battery Backup Unit (BBU). When a fully charged 12-volt battery is installed in the BBU, you will have up to 8 hours of backup power for basic voice service, including calls to 911.
Note: Internet and TV service will not be available during a power outage even if a fully charged battery is installed. The BBU only provides backup power for voice service.