A Digital Subscriber Line (DSL) modem is a device used to connect a computer or router to a telephone circuit that has Digital Subscriber Line service configured. Like other modems, it is a type of transceiver. It is also called a DSL Transceiver or ATU-R (for ADSL Transceiver Unit-Remote). The acronym NTBBA, which stands for network termination broad band adapter, is also common in some countries.