ISO/IEC INTERNATIONAL STANDARD 10028 First edition 1993-11-01 Information technology : Telecommunications and information exchange between systems Definition of the relaying functions of a Network layer intermediate system Technologies de I'information --- Télécommunications et échange d'information entre systemes - Definition de la fonction de transmission d'un systeme intermediaire dans la couche reseau IEC ISO Reference number ISO/IEC 10028:1993(E) Copyright Intermational Organization for Standardization rovided by IHS rmitted without license from IHS Not for Resale ISO/IEC10028:1993 (E) Contents Page Foreword iii Introduction iv Scope 2Normativereferenc Definitions 4Abbreviations and names of NILS elementary sequences 5 The model of relaying by an intermediate systen 6 Features of the Network internal layer service 7Primitives and parameters of the Network internal layer service 8 Sequences of primitives 12 9Autonomous behaviour of relaying components 25 Annexes ASequence of primitives at one NISAP 28 BArchitectural framework (ISO 7498 and ISO 8648) 31 CExamples of typical sequences of NILS prinitives ISO/IEC1993 by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. ISO/IEC Copyright Office·Case Postale 56·CH-1211 Geneve 20·Switzerland Printed in Switzeriand Copyright Intermational Organization for Standardization No reproo ense from IHS Not for Resale @ISO/IEC ISO/IEC10028:1993(E) Foreword SO(theInternationalOrganizationforStandardization)andIEC(theInter- worldwide standardization. National bodies that are members of isO or IEC participate in the development of International Standards through with particular fields of technical activity. ISO and IEC technical com- mittees collaborate in fields of mutual interest. Other international organ- izations, 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 International Standards adopted 75 % of the national bodies casting a vote. International Standard ISO/IEC 10028 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Sub-Committee SC 6, Telecommunications and information exchange between systems. Annexes A, B and C are for information only ili Copyriaht Intemational Oorganizatinfor Standardization ed without license from IHS Not for Resale