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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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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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