Digital Subscriber Line (DSL), a new modem technology, converts existing twisted-pair telephone lines into access paths for multimedia and high speed data communications. DSL can transmit more than 6 Mbps downstream (to a subscriber) and 640 Kbps upstream, and as much as 1.1 Mbps in both directions. Such rates expand existing access capacity by a factor of 50 or more without new cabling. DSL can literally transform the existing public information network from one limited to voice, text and low resolution graphics to a powerful, ubiquitous system capable of bringing multimedia, including full motion video, to everyone's home this century. 

DSL will play a crucial role over the next ten or more years as telephone companies enter new markets for delivering information in video and multimedia formats. New broadband cabling will take decades to reach all prospective subscribers. But success of these new services will depend upon reaching as many subscribers as possible during the first few years. By bringing movies, television, video catalogs, remote CD-ROMs, corporate LANs, and the Internet into homes and small businesses, DSL will make these markets viable, and profitable, for telephone companies and application suppliers alike. 

2. What are the difference of ADSL and SDSL?

ADSL is the abbreviation of Asymmetric Digital Subsriber Line. The speed for downloading and uploading varies. Yet, SDSL(Symmetric Digital Subscriber Line) has equal downloading and uploading time. 

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