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Optical Network Terminal (ONT) battery backup
Learn about the right backup power source for your ONT.
DETAILED INFOONT battery backup equipment
An Optical Network Terminal, or ONT, is a unit typically located on the side of your house or in your garage. An ONT converts the signals from fiber optic light into copper and electric signals. ONTs have a power supply connected to an external battery backup enclosure. The power supply is often located in the home. This enclosure houses a replaceable battery.
Note: Please see your manufacturer's manual when replacing the battery. Incorrect or substitute battery connection creates a risk for fire or explosion.
For additional technical specifications on battery backup, please refer to your manufacturer's user guide.
With new equipment manufactured regularly, older replacement battery equipment may not be available for purchase. Confirm compatibility of any new battery backup equipment with your retailer. When providing backup power to a household with more than one device (for example, both Wi-Fi gateway and ONT), you need a battery backup for each piece of equipment.
Note: Review the digital phone service terms of service or landline residential service agreement for battery backup information and terms and conditions regarding your services.
Note: Please see your manufacturer's manual when replacing the battery. Incorrect or substitute battery connection creates a risk for fire or explosion.
| ONT battery backup enclosures | Compatible replacement batteries |
  CyberPower Compatible with ONTs: ALU H-ONT-B ALU H-ONT-C ALU O-210G-A ALU G-240G-A Ericsson T111G |  Internal battery replacement model: GT12080-HG To replace, visit GS Battery or call 800.472.2879 Note: Do not dispose of the harness when replacing the old battery. The harness is needed to install your new battery in the battery backup enclosure.  |
 APC Power Shield Compatible with ONTs: ALU H-ONT-B ALU H-ONT-C ALU O-210G-A ALU G-240G-A Ericsson T111G |  Internal battery replacement model: APCRBC153 To replace, visit APCÂ or call 800.300.7141 |
 Delta 1 Compatible with ONTs: ALU H-ONT-B ALU H-ONT-C ALU O-210G-A ALU G-240G-A Ericsson T111G | Internal battery replacement model: GT12080-HG To replace, visit GS Battery or call 800.472.2879 |
 Delta 2 Compatible with ONTs: ALU H-ONT-B ALU H-ONT-C ALU O-210G-A ALU G-240G-A Ericsson T111G | Internal battery replacement model: GT12080-HG To replace, visit GS Battery or call 800.472.2879 |
 APC BGE90 Compatible with ONTs: Alcatel-Lucent/AT&T G-010G-AÂ | Internal battery replacement model: APCRBC153 To replace, visit APCÂ or call 800.300.7141 |
For additional technical specifications on battery backup, please refer to your manufacturer's user guide.
With new equipment manufactured regularly, older replacement battery equipment may not be available for purchase. Confirm compatibility of any new battery backup equipment with your retailer. When providing backup power to a household with more than one device (for example, both Wi-Fi gateway and ONT), you need a battery backup for each piece of equipment.
Note: Review the digital phone service terms of service or landline residential service agreement for battery backup information and terms and conditions regarding your services.
