To connect to the Internet via SDSL, a special SDSL Modem is required.
The SDSL modem connects the telephone line to the either a router or
directly to a computer. It is used to convert the digital signals from
the telephone exchange into a format that the computer understands.
SDSL Modems can normally be rented from the Internet Server Provider
(ISP) that provides the broadband Internet access. Alternatively, they
can be purchased from various vendors.