Chapter 21. Digital Subscriber Line
Objectives
Identify and discuss different types of digital subscriber line (DSL) technologies.
Discuss the benefits of using xDSL technologies.
Explain how ASDL works.
Explain the basic concepts of signaling and modulation.
Discuss additional DSL technologies (SDSL, HDSL, HDSL-2, G.SHDSL, IDSL, and VDSL).
Introduction
Digital Subscriber Line (DSL) technology is a modem technology that uses existing twisted-pair telephone lines to transport high-bandwidth data, such as multimedia and video, to service subscribers. The term xDSL covers a number of similar yet competing forms of DSL technologies, including ADSL, SDSL, HDSL, HDSL-2, G.SHDL, IDSL, and VDSL. xDSL is drawing significant attention from implementers and service ...
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