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Asymmetric Digital Subscriber Line. A DSL, or Digital Subscriber Line, commonly transfers data to and from a subscribers premises by 'piggybacking' onto existing infrastructure, most commonly a standard analogue BT telephone line. Existing mains power supply cabling is sometimes utilised, also satellite or proprietary cabled networks. The data transfer is carried out by means of a high-frequency 'carrier' which does not interrupt the normal working of the existing service used as the vehicle for transmission. Data transfer is divided into two components - transmission and reception. In Asymmetric transfer (ADSL), one (usually transmission) is carried out at a slower rate than the other.
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