Which technology delivers high-speed internet over traditional telephone lines?

Which technology delivers high-speed internet over traditional telephone lines?

• A. Fiber optic
• B. Cable
• C. Digital subscriber line (DSL)
• D. Wireless

Answer: (C)

DSL delivers high-speed internet over existing copper telephone lines by using the higher-frequency portion of the line for data while leaving enough bandwidth for voice calls. This way you can have phone service and internet on the same copper pair. A DSL modem at your location communicates with a DSLAM at the service provider’s central office, and a filter or splitter is used to separate voice from data signals so you can talk on the phone while online. The speed you get depends on distance from the central office—the signal attenuates over longer runs, so closer connections are faster. Variants like ADSL and VDSL offer different balance of download and upload speeds. Other options—fiber optic (glass), cable (coaxial), and wireless (radio)—use different infrastructures, not traditional telephone lines.

DSL delivers high-speed internet over existing copper telephone lines by using the higher-frequency portion of the line for data while leaving enough bandwidth for voice calls. This way you can have phone service and internet on the same copper pair. A DSL modem at your location communicates with a DSLAM at the service provider’s central office, and a filter or splitter is used to separate voice from data signals so you can talk on the phone while online. The speed you get depends on distance from the central office—the signal attenuates over longer runs, so closer connections are faster. Variants like ADSL and VDSL offer different balance of download and upload speeds. Other options—fiber optic (glass), cable (coaxial), and wireless (radio)—use different infrastructures, not traditional telephone lines.