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Digital Subscriber Line (DSL) is the generic name for a technology that allows large amounts of digital information to be sent over an ordinary copper telephone line. DSL increases
http://www.westlake.co.uk/SDSL.htm
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SDSL (Symmetric Digital Subscriber Line) services are not as common as ADSLs, but a few service providers do offer them. SDSLs are very similar to ADSL connections, but the difference
http://www.brighthub.com/office/collaboration/arti...
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Generally speaking premises that are in an area close enough to an ADSL Enabled BT Exchange can receive an ADSL Broadband connection, where as premises out of range of a BT Exchange
http://www.livehebrides.com/broadband-questions
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