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  4. What the Lights on Your XFINITY Voice Modem Mean

What the Lights on Your XFINITY Voice Modem Mean

An XFINITY Voice modem combines your cable modem and analog telephone adapter. The lights on the modem indicate different functions; this article explains what they mean.

Note: You can view a typical modem diagram here.

Below are descriptions of these lights.

Telephone 1 or Telephone 2

Battery 1 or Battery 2

  • If your XFINITY Voice modem is equipped with two battery slots, only one battery is needed in order to receive up to eight hours of backup power.
  • One of the battery lights should be solid if the battery is good and connected properly. Your connection should not be affected by the status of the battery lights as long as you have power to the modem*.
  • If the battery light is off and you have a backup battery inserted into the modem, make sure the battery is securely connected to the modem. If you do not have a backup battery installed, this light will remain off.
  • If the light is flashing, your battery is depleted and may not provide backup power in the event of an outage.

A backup battery can be installed in your XFINITY Voice modem to provide additional hours of service during a power outage. If your battery is missing or depleted and you would like to purchase a new one, visit Buy a Phone Modem Battery for Your XFINITY Voice Service for more information on purchasing a battery.

XFINITY Voice Service Interruption

*If XFINITY Voice service is interrupted as a result of downed cables connecting to your home or cuts to other portions of our network (as can happen in cases of severe storms), the service will not function until those facilities are restored. Depending on the specific facilities impacted, traditional phone providers may be affected.

Recycle Your Used Battery

For detailed instructions on how to recycle your used battery please see Recycle Your Used Battery.

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