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ATM Standards Bodies and History - A Comprehensive Overview

This chapter provides an overview of ATM standards bodies, their responsibilities, and the history of ATM. It also outlines the major ATM standards and describes the ATM protocol layers.

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ATM Standards Bodies and History - A Comprehensive Overview

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  1. Chapter Objectives • After completing this chapter you will be able to: • List the ATM standards bodies • Outline the responsibilities of the ATM Forum • Describe briefly the history of ATM • Outline the major ATM standards • Describe the ATM protocol layers

  2. ATM Standards Bodies • Main international standards organisation for ATM is the ITU-T • ITU-T decision-making is relatively slow • Based on absolute majority voting

  3. ATM Forum • Formed in 1991 • Committee of companies • ATM Products, Software, Test and Service Providers • Developed early standards via White Papers • Single technical committee ensures integrity • Works closely with international standards bodies (IETF, ITU-T, ANSI etc.) • Develops faster • based on 2/3 majority voting

  4. ATM’s History • 1983 - First ATM papers published • 1987 - ITU-T selects ATM for B-ISDN • 1990 - ITU-T issues 13 recommendations • 1992 - First ATM LANs installed • 1993 - First ATM WANs installed

  5. API SIG AMS CES SMDS FRS LE MN Network Lan ATM UNI Multi-Media Nx64K SIP CLS FR SSCS Man’mnt Emulation ATM UNI V4.0 Conversational V4.0 Signalling Signalling T1 Video on Protocol API Demand SSCF E1 Broadcast SSCOP AAL5 AAL1, AAL3/4 AAL5 AAL5 AAL5 AAL1 AAL-API CPCS AAL5 CPCS CPCS Null AAL SAR SAR SAR SAR SAR SAR SAR API End-to-End ATM Performance Objectives (I.350) Minimum Quality of Service Values Physical Layer ATM’s Services Aspects Work Groups

  6. Published Recommendations • From the ATM Forum: • A major work is the user-network interface specification • Known as UNI 3.1, 4.0, 4.1 (1999) • UNI 3.1 is a collection of specifications that apply to the user-network interface • UNI 4.0 and later specifications and revisions are published as individual papers • The current list of approved papers and work in progress is available at: www.atmforum.com

  7. The International Standards • Published by ITU-T • I.113 B-ISDN Vocabulary • I.121 Broadband Aspects of ISDN • I.150 B-ISDN ATM Characteristics • I.211 B-ISDN Service Characteristics • I.311 B-ISDN Network Aspects • I.321 B-ISDN Protocol Reference Model • I.327 B-ISDN Functional Architecture • I.361 B-ISDN ATM Layer Specification • I.362 B-ISDN ATM Adaption Layer • I.413 B-ISDN User-Network Interface • I.432 B-ISDN UNI Physical Layer Specification • I.610 OAM Principles of B-ISDN Access • Q.2931 B-ISDN Access Signalling

  8. ATM Protocol Layers Higher layers CS Adaptation Layer SAR Layer two ATM Layer TC Layer one Physical Layer PMD

  9. Management software Signalling software Interfaces Fabric Input/output buffers scheduler, mappings High-speed switching ATM Switching Nodes

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