Digital subscriber lines
Digital Subscriber Lines (DSLs), transmission systems that allow high-speed digital transmission on ordinary phone lines, are overviewed in this article. This article focuses mainly on the transmission technologies and the challenges of high-speed transmission on twisted-pair phone lines, but also considers basic terms of reference and network/applications interfaces. Loop topology, transmission impairments, and transmission techniques are reviewed for the most popular DSLs, as are the basic connections necessary for a complete ADSL service through a service-provider's network. For a more complete discussion of DSLs, see the book by the same three authors [J. Cioffi, T. Starr, P. Silverman, Digital Subscriber Lines, Prentice-Hall, Upper Saddle River, NJ, 1998].
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