A DSL cable carries both data and voice signals. This is made possible by DSL modems, which contain an Internet signal splitter that allows voice and data signals to be carried over a single DSL cable so customers can use the Internet and phone at the same time.
DSL stands for digital subscriber line, and it uses the same cables as telephones do. However, DSL customers do not need to turn off their telephones or obtain a second phone line to use the Internet, as they did with traditional dial-up service and analog modems. DSL connection speeds are much faster than those of analog modems.