Motorola SURFboard SBV5220 Digital Voice Modem with Integrated Battery Backup Combination modem and phone adapter, equipped with an integrated Lithium-ion battery back-up Serves as a single device connecting customers to their digital voice and high-speed Internet services Powerw up to two phone lines in the home using standard RJ-11 connectors eMTA can connect to a computer through either a 10/100Base-T Ethernet or a USB data port