When AT&T introduced the Internet 45 tier in 2013, installations were initially done with the iNID. AT&T later standardized on the Motorola NVG589, which supports pair-bonding for both ADSL2+ and VDSL2. AT&T also uses the NVG589 in some installations where the customer otherwise is too far from a node for service. Additionally, it supports an internal battery for those who subscribe to AT&T Phone service for battery backup during power failures. AT&T no longer supplies the battery to customers for any residential service.