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ADSL (Asymmetric Digital Subscriber Line) - Definition

ADSL is commonly called DSL (Digital Subscriber Line). It is a data communications technology and equipment that enables high-speed data transmission over copper telephone lines than a conventional voiceband modem can provide. It does this by utilizing frequencies that are not used by a voice telephone call. ADSL can transmit at high rates of speed both upstream and downstream, depending only on line distance. ADSL actually uses two separate frequency bands, referred to as the upstream and downstream bands. The upstream band is used for communication from the end user to the telephone central office. The downstream band is used for communicating from the central office back to the end user.

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