Request Quote Order Now

Welcome to Fios

Battery Backup Unit (BBU) Audible Alarms

Your BBU is equipped with an audible alarm to inform you of problems with your BBU. The alarm sounds for two seconds and then is silent for 58 seconds. The conditions listed below are the potential reasons for the audible alarm. You can use the alarm in combination with the indicator lights to troubleshoot your BBU issue.

Low Battery - Alarm is silenced if the battery voltage goes above 12V (electrical power has returned), the battery is fully discharged, or the battery is removed from the BBU.

Foreign Voltage - Alarm is silenced once the foreign voltage has been properly removed.

Replace Battery - Alarm is silenced when the battery is removed.

Overcurrent - Alarm is silenced once the overcurrent has been properly removed.

Since you are responsible for ensuring that a battery is installed and maintained in the BBU, it is very important that you familiarize yourself with the indicator lights and audible alarm to ensure that you have backup power if it's needed.

Please note: During a power outage, only your standard telephone service will receive power if an active battery is installed in the BBU. The BBU will not operate your Internet or video services, or your router. The BBU will shut down approximately one hour before that battery has completely drained. If you need to make an emergency phone call after the BBU has shut down, press the Battery Emergency Use button on the ONT. This should enable the ONT to reboot and provide up to one hour of talk time. After you press the Battery Emergency Use button, the BBU will operate until the battery has completely drained. 
 

Batter Backup Unit (BBU) Indicator Lights

You have received one of the following BBU models as part of your Verizon Fios installation. Please look at the photos to determine which model you have.


Models #1 and #2

The models above use a combination of lights and buttons to signify certain conditions, as described below:

Buttons:

Battery Emergency Use - To protect you in an emergency, if an active battery is installed in the BBU, the BBU will shut down approximately one hour before the battery is fully depleted. If you need to make a phone call, press the Battery Emergency Use button once. This will enable the ONT to reboot, and provide you with up to one hour of battery life for emergency calls. After the button is pushed, all remaining battery life is used.

Alarm Silence - Press this button to silence an audible alarm. 

Lights:

Auxiliary Power:
Not currently available

Replace Battery:
Red - Battery needs to be replaced  

Battery Power:
Red - ONT is operating off battery power;
no AC power available


Blinking Red - Battery power is low

System Status:
Green - Indicates normal operation

Blinking Green - Indicates system fault
 

Model #3

Systems:
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.

Battery:
Green - ONT is operating normally. BBU is on standby.
Yellow - Battery is either recharging or conducting a self-test, or the BBU is providing power to the ONT.
Red - Battery is low. When this light comes on, approximately two hours of talk time remain.

Replace Battery:
Red - Battery needs to be replaced.

Auxiliary:
Green - Auxiliary battery pack (ABP) is connected to the BBU, ABP option is currently not available.
Off - No auxiliary battery pack is connected.
 

See Also:

Welcome to Fios

It’s possible that after electrical power is restored, you may still be without FiOS TV service. Sometimes resetting your Battery Backup Unit (BBU) is needed.

To reset your Battery Backup Unit:

1.     Unplug the electrical power cord of your BBU from the wall outlet.

2.     Wait one minute and then plug the cord back into the wall and see if the Optical Network Terminal (ONT) resets itself.
If the ONT resets itself then your FiOS TV service should come back online. If it doesn't you can try to reconnect the battery, if one is maintained in the BBU.


To reconnect the battery in your BBU:

1.     Unplug the electrical power cord of your BBU from the wall outlet.

2.     Open the battery cabinet on the BBU (you may need a screwdriver to do this).

3.     Disconnect the battery leads and wait 10 seconds. Reconnect the battery leads.

4.     Put the battery cabinet back on and then plug the power cord back into the wall and see if the ONT resets itself.


If the ONT resets itself then your FiOS TV service should come back online.