How DSL Works
Digital Subscriber Line (DSL) doesn’t need any special wires. It is delivered over copper phone lines – which are often called POTS (plain old telephone system).
DSL service needs a DSL modem at each end of the connection. DSL modems are different from traditional modems because they never translate the signals from digital data to analog data like traditional modems do. All data is sent and received as digital data.
Traditional modems and telephone calls use only a small portion of the copper phone lines’ potential bandwidth. DSL divides the phone line into three channels: one for receiving data, one for sending data, and one for talking on the phone. That it was allows people with DSL modems to surf on the Internet at high speeds and talk on the phone at the same time over the same phone line.
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In order for your DSL modem to work, it must be within a certain distance of your phone company’s. The distance can vary depending on the DSL service, speed, and the gauge of the copper telephone wire. For DSL speeds of 2.048Mbps to 8.448 Mbps, the distance can range from 16 000 to 9 000 feet away.