Final answer:
DSL is the technology that uses broadband modem technology to transport high-bandwidth data over regular phone lines, utilizing existing copper phone lines while coexisting with traditional voice services.
Step-by-step explanation:
The service that uses broadband modem technology to transport high-bandwidth data over regular phone lines is known as DSL (Digital Subscriber Line). DSL technology allows for high-speed internet access using the existing copper phone lines without interrupting regular phone services. Unlike fiber optic or cable services that may require new specialized infrastructure, DSL utilizes the pre-existing telephone network which has been a traditional method for voice communication.
While fiber optic communication represents a leap in technology, providing low loss, high bandwidth, and reduced crosstalk over extended distances, DSL is the technology that matches the provided description about utilizing phone lines. Fiber optic and satellite services require different infrastructural setups, and cable typically refers to systems that provide internet access over television cable networks.
In the history of telecommunications, adaptive transformations like shifting from wired to microwave and satellite transmissions have allowed multiple firms to use the same transmission mechanisms efficiently. Today, DSL serves as an accessible high-speed internet option for homes and businesses still relying on telephone line infrastructure.