2.1 Introduction

Demand for fast and dependable access to Web-based applications and real-time delivery of multimedia transmissions via an integrated network infrastructure drives implementation of ATM (Asynchronous Transfer Mode) broadband solutions. ATM is a high-speed, high-performance multiplexing and switching technology that provides bandwidth on-demand for seamless transport of full-motion video, audio, data, animations, and still images in local and wider area environments.

A flexible and extendible telecommunications solution, ATM interlinks distributed networks and heterogeneous technologies into integrated configurations, thereby eliminating the need for multiple network overlays. ATM interworks with diverse narrowband and broadband wireline architectures, protocols, and technical solutions such as SONET/SDH (Synchronous Optical Network and Synchronous Digital Hierarchy), WDM (Wavelength Division Multiplexing), and DWDM (Dense WDM). ATM also interoperates with FDDI (Fiber Data Distributed Interface), Ethernet, Fast Ethernet, Frame Relay, ISDN, and IP (Internet Protocol) and wireline and wireless residential broadband access networks employing cable modem, DSL (Digital Subscriber Line), and VSAT (Very Small Aperture Terminal) solutions. In addition, ATM works in conjunction with second-generation GSM (Global System for Mobile Communications) and third-generation UMTS (Universal Mobile Telecommunications Systems) cellular communications technologies.

The ATM platform enables fast access to basic and sophisticated tele-education, telemedicine, electronic commerce (E-commerce), and electronic government (E-government) services. ATM networks are reliable, dependable, and scalable, and flexibly accommodate an array of topologies, applications, and services.

2.2 Purpose

ATM is a complex cell multiplexing and switching technology. This chapter provides a high-level introduction to ATM technical attributes, features, and functions. Representative ATM implementations that support a diverse...