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

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Chapter 12. Integrated Services Digital Network

Objectives

  • Explain what ISDN is.

  • Describe ISDN devices and how they operate.

  • Describe the specifications for ISDN data transmittal for the three layers at which ISDN transmits.

Introduction

Integrated Services Digital Network (ISDN) is comprised of digital telephony and data-transport services offered by regional telephone carriers. ISDN involves the digitization of the telephone network, which permits voice, data, text, graphics, music, video, and other source material to be transmitted over existing telephone wires. The emergence of ISDN represents an effort to standardize subscriber services, user/network interfaces, and network and internetwork capabilities. ISDN applications include high-speed image ...

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