What technology provides high-speed internet access over telephone lines?

DSL, or Digital Subscriber Line, is the technology that provides high-speed internet access over traditional telephone lines. It achieves this by using a frequency range that is higher than the voice frequencies, allowing both voice and data to be transmitted simultaneously on the same line. This means that users can make phone calls while still using the internet without interruption.

DSL technology connects to a network interface device, which is usually installed at the customer’s premises, allowing for relatively high-speed data transfer without needing to lay additional cables. It typically offers faster upload and download speeds compared to dial-up connections, making it a popular choice for residential and small business internet access.

In comparison, cable modems utilize coaxial cable for internet connectivity, satellite technology relies on satellites for broadband access, and cellular networks provide access through mobile phone signals. Each of these technologies has its own unique infrastructure and usage scenarios that differ significantly from DSL's use of existing telephone lines.