What type of technology does Digital Subscriber Line (DSL) use?

• A. Optical fiber
• B. TV coaxial cable
• C. Telephone wires
• D. Satellite connections

Answer: (C)

Digital Subscriber Line (DSL) technology utilizes existing telephone wires to provide high-speed internet access. This method allows for data to be transmitted over standard copper telephone lines, enabling users to connect to the internet without disrupting regular voice service on the same line.

The reason this method is advantageous is that it capitalizes on infrastructure that is already widely installed, making it accessible to many users without the need for significant new construction or cabling. DSL achieves high speeds through frequency division, where different frequencies are used to separate data and voice signals, allowing both to coexist on the same line.

In contrast, other options such as optical fiber use light transmission through glass or plastic fibers, coaxial cable is typically associated with cable internet services, and satellite connections involve communication with orbiting satellites, which often have higher latency and are subject to weather-related issues. Therefore, the defining characteristic of DSL is its reliance on standard telephone wires for transmitting internet data.