ISO/IEC INTERNATIONAL STANDARD 8473-5 First edition 1997-05-01 Information technology Protocol for providing the connectionless-mode network service: Provision of the underlying service by ISDN circuit-switched B-channels Technologies de I'informationProtocole pour la fourniture du service de reseau en mode sans connexion: Fourniture du service sous-jacent par canaux B commutés au circuit ISDN Reference number ISO/IEC 8473-5:1997(E) Copyright Intermational Organization for Standardization mitted without license from IHS Not for Resale ISO/IEC 8473-5:1997(E) Contents Page 1 Scope.... 1 2 Normative references . 1 2.1 Identical Recommendations I International Standards . 1 2.2 Paired Recommendations | International Standards identical in technical content . 1 2.3 Additional references... 1 3 2 3.1 Reference model definitions ... 2 3.2 Network layer architecture definitions ... 2 3.3 2 4 Abbreviations. 2 5 Subnetwork dependent convergence function... 3 5.1 General model............. 3 5.2 Subnetwork user data.... 3 5.3 Subnetwork dependent convergence functions used with ISDN circuit-switched B-channel. 4 6 7 6.1 Static conformance.. 7 6.2 Dynamic conformance . 7 6.3 PICS proforma .. 7 Annex A - PICS proforma ... 8 A.1 Introduction.. 8 A.2 Abbreviations and special symbols.. 8 A.3 Instructions for completing the PICS proforma ... 8 A.4 Identification.. 10 A.5 Subnetwork dependent convergence functions for use with X.25 subnetworks... 11 ISO/IEC1997 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 micro- film, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 Switzerland Printed in Switzerland ii CopyrightIntemational Organization for Standardization nitted without license from IHS Not for Resale ISO/IEC 8473-5:1997(E) @ ISO/IEC Foreword ISO (the International Organization for Standardization) and IEC (the Inter- national Electrotechnical Commission)form the specialized systemfor worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by therespectiveorganizationto deal withparticular 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 joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 8473-5 was prepared by Joint Technical Committee ISO/IEC JTC1,Information technology, Subcommittee SC 6, Telecommunications and information exchangebetweensystems,in collaboration with ITU-T. The identical text is published as ITU-T Recommendation X.625. 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: Provisions 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 Part 5: Provision of the underlying service by ISDN circuit-switched B-channels Annex A forms an integral part of this part of ISO/IEC 8473. ili CopyrightIntematinal Organization for Standardization e from IHS Not for Resale