DSL modem

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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.

Some DSL modems also manage the connection and sharing of the DSL service in a network, in this case, the unit is termed a DSL router or residential gateway. DSL routers have a component that performs framing, while other components perform Asynchronous Transfer Mode Segmentation and Reassembly, IEEE 802.1D bridging and/or IP routing (including network address translation). Typical user interfaces are Ethernet and Universal Serial Bus (USB). Although a DSL modem working as a bridge does not need an IP address, it may have one assigned for management purposes.

Compared to voice-band modem

A DSL modem modulates high-frequency tones for transmission to a Digital Subscriber Line Access Multiplexer (DSLAM), and receives and demodulates them from the DSLAM. It serves fundamentally the same purpose as the voice-band modem that was a mainstay in the late 20th century, but differs from it in important ways.

  • DSL modems transfer data at a rate which is typically 10 to 20 times that of a voice-band modem.

  • A single telephone line can be used for simultaneous voice and data with a......
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