ST.10 7776-ENGL 1995 4851903 0696807 0T7 INTERNATIONAL ISO/IEC STANDARD 7776 Second edition 1995-07-01 AMENDMENT 1 1996-11-15 Information technology Telecommunications and information exchange between systems --- High-level data link control procedures Description of the X.25 LAPB-compatible DTE data link procedures AMENDMENT 1: Modulo 32 768 and multi-selective reject option Technologies de I'information - Télécommunications et échange d'information entre systemes - Procédures de commande de liaison de données a haut niveau - Description des procédures de liaison d'équipement terminal de transmission de donnees ETTD compatible X.25 LAPB AMENDEMENT 1: Option de rejet modulo 32 768 et multisélective This material is reproduced from Iso documents under International Organization for Standardization (isO) Copyright License number IHS/icC/1996.Notforresale.NopartoftheseISOdocumentsmaybe reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHS or the isO Licensor's members. IEC Reference number ISO/IEC 7776:1995/Amd.1:1996(E) Copyright International Organization for Standardization d by IHS Not for Resale 4851903 0696808 STD.ISO 0 7776-ENGL 1995 EEI ISO/IEC 7776:1995/Amd.1:1996(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technica! 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 joint technical committee are circulated to national bodies for voting. of the national bodies casting a vote. Amendment 1 to International Standard ISO/lEC 7776:1995 was prepared by Joint Technical Committee ISO/IEC JTC 1. Information technology, Subcommittee sc 6,Telecommunications and information exchange between systems. ?ISO/IEC1996 All rights reserved.Unless otherwisespecified,nopartof thispublicationmaybe reproduced or utilized in any form or by any means, electronic or mechanicai, 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 i Copyright Intemational Organization for Standardization ing permitted without license from IHS Not for Resale 7776-ENGL 1995 STD.ISO EobTsh 069680997T CISO/EC ISO/IEC 7776:1995/Amd.1: 1996(E) Introduction This amendment to ISO/EC 7776:1995 adds the multi-selective reject option (option 3.3) 1SO/IEC 7776:1995 in the following areas: retransmissions of one or more I frames with a single request; this improved efficiency received I frames are saved by the DTE for deferred delivery; . allows for a much larger modulo for operation over links that have high data rates or large propagation delays; . the maximum number of outstanding frames k can be as large as the modulus number minus 1; . the additional procedures are fairly simple to implement. ili Copyright Intermational Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale STD.IS0 7776-ENGL 1995 48519030696810691 ISO/EC 7776:1995/Amd.1: 1996(E) ISO/EC Information technology - Telecommunications and information exchange between systems - High-level data link control procedures -- Description of the X.25 LAPB-compatible DTE data link proce