ISO/IEC INTERNATIONAL STANDARD 8473-3 First edition 1995-03-15 Information technology Protocol for providing the connectionless-mode network service: Provision of the underlying service by an X.25 subnetwork Technologies de I'information - Protocole de fourniture du service de réseau en mode sans connexion: Fourniture du service sous-jacent par un sous-réseau X.25 IEC Reference number ISO/IEC 8473-3:1995(E) Copyright Intermational Organization for Standardization d by IHS Not for Resale ISO/IEC 8473-3:1995(E) Contents Page 1 Scope 1 2 Normative references 2.1 Identical Recommendations I International Standards 2.2 PairedRecommendationsIInternationalStandards 2.3 Additionalreferences 3 Definitions 2 3.1 Reference model definitions . 2 3.2 Network layer architecture definitions. 2 3.3 Network layer addressing definitions 2 3.4 X.25 definitions.. 2 4 Abbreviations.. 2 5 Subnetwork dependent convergence function. 5.1 General model.. 3 5.2 Subnetwork user data.... 3 5.3 Subnetwork dependent convergence functions used with X.25 subnetworks 3 Annex A - PICS proforma .. A.1 Introduction..... 7 A.2 Abbreviations and special symbols. 7 A.3 Instructions for completing the PICS proforma .. 7 A.4 Identification... 9 A.5 Subnetwork dependent convergence functions for use with X.25 subnetworks 10 ISO/IEC1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, eiectronic 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 ii No reproduction or networking permited without icense from IHS Not for Resale @ ISO/IEC ISO/IEC 8473-3:1995(E) Foreword ISO (the International Organization for Standardization) and IEC (the Inter nationalElectrotechnicalCommission)formthespecializedsystemforworldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular 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 International Standards adopted by the jointtechnicalcommitteeare circulatedtonational bodiesfor voting.Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 8473-3 was prepared by Joint Technical Com- mittee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecom- munications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Recommendation X.622. ISO/IEC 8473 consists of the following parts, under the general title Information technology -Protocol for providing the connectionless-mode network service: PartI:Protocol specification Part 2: Provision of the underlying service by an ISO/IEC 8802 subnetwork - Part 3: Provision of the underlying service by an X.25 subnetwork Part 4: Provision of the underlying service by a subnetwork that provides the OSI data link service Annex A forms an integral part of this part of ISO/IEC 8473. iii Copyright l No reproduction or networking permited without license from IHS Not for Resale