What type of lines do Digital Subscriber Line (DSL) Internet service providers utilize?

Digital Subscriber Line (DSL) Internet service providers utilize phone lines, specifically the traditional copper telephone lines. This technology takes advantage of the existing network of telephone lines to deliver high-speed Internet access to homes and businesses. By using a different frequency than that used for voice calls, DSL allows for simultaneous voice and data transmission over the same line.

DSL operates by modulating digital data into analog signals that can travel over the copper wire, which optimizes the line for data transfer. Unlike coaxial or fiber optic lines—which are used in other forms of Internet delivery—DSL maintains the infrastructure of the telephone system. This makes it accessible in many areas without the need for extensive new installations.