A telecommunication technology called DSL (Digital Subscriber Line) is used to transmit digital data over regular telephone lines. DSL is one of the most widely used methods by which Providers offer fast Internet connectivity, along with cable Internet.

Low frequencies between 0 Hertz and 4 kHz are used to send the speech information when using a cellphone to place a contact. The "voiceband" only makes use of a tiny portion of the frequency band that copper phone lines can handle. As a result, DSL uses greater frequencies, between 25 kHz and 1.5 MHz, to send digital data. These frequencies can still interfere with phone calls even though they are higher than the maximum perceptible frequency (20 kHz). To prevent high frequencies from interfering with phone conversations, Broadband filters or splitters are therefore used.

With an identical division of source and downstream frequencies, symmetric DSL (SDSL) offers fast data transmission and reception. Providers usually provide asymmetric DSL (ADSL) service because most customers receive more data than they send. For downstream uploads, ADSL gives a broader frequency band, which offers significantly quicker downstream rates. For instance, an ASDL link might give 20 Mbps downstream and 1.5 Mbps upstream while an SDSL connection might offer 2 Mbps upstream and downstream.

In order to reach the Internet using DSL, you must link to a DSL Internet service provider (ISP) (ISP). You will receive a DSL connection from the Provider, which you can use to link to a PC or a network. You can now link to your DSL modem using Wi-Fi thanks to the wireless devices that some modern DSL modems have built in. A coupler and filters that you can attach to home phones may also be included in a Broadband package.

You must reside a specified distance from a Provider to be qualified for DSL Internet service because DSL transmissions have a restricted range. Broadband is now accessible in the majority of metropolitan regions, but it is not common in remote ones.