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Transmission technology that consists of modems attached to twisted-pair copper wiring that transmit from 1.5 Mbit/s to 8 Mbit/s downstream (to the subscriber) and up to 1.5 Mbit/s upstream, depending on line distance. Several standards exist for ADSL, namely T1.413 Issue 2, ITU-T G.992.1 (G.DMT) and ITU-T G.992.1 (G.Lite).
