DSL is delivered over a single copper telephone line. It is brought to one's office or residence by using regular POTS lines, and in most cases the users need to be less than 15-20,000 feet from a carrier's central office. You most likely will not need an additional phone line or any new wiring to get DSL installed to your site. DSL uses a different set of "frequencies" than normal phone service, so it allows both Internet and voice traffic to work simultaneously on the same physical phone line. Most carriers will provide filters - these plug into the main phone jack on your wall and help to optimize performance. You can connect a cable to your regular phone from the filter, and connect to the router/modem to your PC. You will need a router or modem (usually provided or recommended by the carrier) to terminate your DSL circuit. DSL is an "always-on" connection and you can have your Internet running while still using the telephone.
How is DSL delivered
