Battery Backup

Optimum Voice uses your home's electrical power and a cable modem to provide your home phone service. Like a cordless phone, Optimum Voice will not operate if the power in your home goes out.

A battery backup can be connected to your Optimum Voice cable modem to provide standby power during a power outage.

Optimum Voice battery backups for the following cable modems are currently available at your local Optimum Store Optimum Store or at

Note: To select the correct battery backup, you will need the make and model number of your cable modem. A sticker located on either the side or bottom of your cable modem indicates the manufacturer and model.