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DSL Modems
An asymmetric digital subscriber line transceiver, also known as an ADSL modem or DSL modem, is a device used to connect a single computer to a DSL phone line, in order to use an ADSL service. Some ADSL modems also manage the connection and sharing of the ADSL service with a group of machines: in this case, the unit is termed a DSL router or residential gateway. A DSL modem acts as the ADSL Terminal Unit or ATU-R, as the telephone companies call it. The acronym NTBBA (network termination broad band adapter, network termination broad band access) is also common in various countries. Because a DSL modem is a bridge, it has no interface and the IP address that is configured to the computer it is attached to is assigned to the device.
Despite its name, DSL does not refer to a physical line but to a modem—or rather a pair of modems. A DSL modem pair creates a digital subscriber line, but the network does not purchase the lines when it buys ADSL—it already owns those—it purchases modems.
A DSL modem transmits duplex (i.e., data in both directions simultaneously) at 160 kbps over copper lines of up to 18,000 feet. DSL modems use twisted-pair bandwidth from 0 to approximately 80 kHz which precludes the simultaneous use of analog telephone service in most cases.