ISO/IEC INTERNATIONAL STANDARD 9066-1 First edition 1989-11-15 Information processing systems - Text communication - Reliable Transfer Part 1 : Model andservice definition Systemes de traitement de I'information -- Communication de texte - Transfert fiable Partie1:Modeleetdefinitionduservice Reference number ISO/IEC 9066-1:1989 (E) Copyright Int ISO/IEC9066-1:1989(E) Contents Page Foreword ii Introduction iv 1 Scope 2 Normativereferences 3 Definitions 4 Abbreviations 5 Conventions 3 6 Reliable Transfer Model 7 Overview of service 6 8 RelationshipwithotherASEs and lowerlayer services 6 9 Service definition 8 10 Sequencinginformation 13 ISO/IEC1989 Aii rights reserved. No part oi this pubication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office·Case postale 56·CH-1211 Geneve 20·Switzerland Printed in Switzerland 11 Copyright International Organization for Standardization ISO/IEC9066-1:1989(E) Foreword ISo (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) together form a system for worldwide standardization as a whole. National bodies that are members of ISO or IEC participate in the develop- ment of International Standards through technical committees established by the respective organization to deal with particuiar fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISo and IEc, also take part in the work. In the field of information technology, iso and IEc have established a joint technical committee, ISO/IEC JTC 1., Draft Internationat Standards adopted by the joint technical committee are circulated to national bodies for approval before their accep- tance as International Standards.They are approved in accordance with procedures re- International Standard 1SO/IEC9066-1was prepared by Joint Technical Committee ISO/IEC JTC 1,Information technology. ili