IEC ISO ISO/IEC 24740 Edition 1.02008-01 INTERNATIONAL STANDARD Information technology - Responsive link (RL) ISO/IEC 24740:2008(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2008 ISO/lEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester. publication, please contact the address below or your local IEC member National Commitee for further information. IEC Central Office 3, rue de Varembé CH-1211 Geneva 20 Switzerland Email: [email protected] Web:www.iec.ch About the IEC International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. - Catalogue of IEC publications: www.iec.ch/searchpub The IEc on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical commitee,..). It also gives information on projects, withdrawn and replaced publications. - IEC Just Published: www.iec.ch/online news/justpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and also by email. - Electropedia: www.electropedia.org The world's leading online dictionary of electronic and electrical terms containing more than 2o ooo terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. CustomerServiceCentre:www.iec.ch/webstore/custsery If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service CentreFAQorcontactus: Email:[email protected] Tel.: +41 22 919 02 11 Fax:+41229190300 TEC ISO ISO/IEC 24740 Edition 1.0 2008-01 INTERNATIONAL STANDARD Information technology - Responsive link (RL) INTERNATIONAL ELECTROTECHNICAL COMMISSION PRICE CODE ICS 35.200 ISBN 2-8318-9542-1 24740 @ ISO/IEC:2008(E) - 2 - CONTENTS FOREWORD INTRODUCTION. .5 Scope. 2 Normative reference .. 3 Definitions, terms and abbreviations... 3.1Terms and definitions. 3.2 Abbreviations ... 4 Conformance.... 8 5 Responsive Link structure .... .8 5.1 Outline of Responsive Link. 5.2 Osl reference model .. 6 Layer 1 (physical layer) 6.1 Separate transmission of data and event 9 6.2 Physical interface .. Layer 2 (data link layer).. 10 7.1 Error correction . 10 7.1.1 General . 10 7.1.2 CODEC 7.1.3 Error correction encoding 10 7.1.4 Bit stuffing ... 7.1.5 NRZI encoding 7.2 Frame format.. 11 7.2.1 Packet. 7.2.2 Frame.. 7.2.3 Setup pattern... 7.2.4 Idle pattern... 7.2.5 Bit synchronization and clock rate ... 7.2.6 Error handling..... 7.3 Automatic reconfiguration (plug and play)... 12 8 Layer 3 (network layer). 12 8.1 Packet overtaking function 8.2 Responsive Link packet format.. 8.2.1 Header format . 12 8.2.2 Priority... 8.2.3 Data packet .. 8.2.4 Event packet . 14 8.3 Routing 15 8.3.1 General 15 8.3.2 Routing table . 15 8.3.3 Independent routing of data and event... 16 8.3.4 Priority-based routing 16 9 Layer 4 (transport layer).. 9.1 Priority replacement for packet acceleration/deceleration 9.2 Multi-link 17 - 3 - 24740 @ ISO/IEC:2008(E) 9.3 Stream data transmission. .17 Annex A (informative) Characteristics of real-time communications. 18 Annex B (informative) Real-time scheduling.... Annex C (informative) An implementation of the Responsive Link interface. .20 Annex D (informative) Examples of implementation .21 D.1 An implementation of the Responsive Link switch.. D.2 An implementation of overtaking buffers .22 Annex E (informative) Examples of routing of data and event.. .23 E.1 An example of independent routing of data