DSL (Digital Subscriber Line)

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A high-speed dedicated digital circuit from a given location to the telephone company’s central office, using normal copper telephone lines. DSL provides a separate channel for voice and fax, which means that phone calls and faxes can be carried at the same time high-speed data is flowing across the line. DSL is a general term that includes several variations: ADSL (Asymmetric Digital Subscriber Line), ranging up to 1.5 Mbps; HDSL (High-bit-rate Digital Subscriber Line), 1.5 Mbps; SDSL (Single-line Digital Subscriber Line), 1.5 Mbps; VDSL (Very high-data-rate Digital Subscriber Line), ranging up to 2.3 Mbps; and RDSL (Rate Adaptive Digital Subscriber Line), various speeds.