ISO/IEC TECHNICAL REPORT TR 15294 First edition 2000-04-01 Information technology Methods for data flow control at synchronous and asynchronous DTE-DCE interfaces TechnologiesdeIinformation-MethodespourinterfacesDTE-DCE synchrones etasynchrones decommandedefluxdedonnees Reference number ISO/IEC TR 15294:2000(E) IEC ISO @ISO/IEC2000 ISO/IECTR15294:2000(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing.Every care has been taken to ensure that the file is suitable for use by isO memberbodies. In the unlikely event C ISO/EC2000 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 microfilm, without permission in writing from either ISO at the address below or ISO's member body in the countryof the requester. ISO copyright office Case postale56.CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 4122 734 10 79 E-mail [email protected] Web www.iso.ch Printed in Switzerland ii @ISO/IEC2000-All rights reserved ISO/IECTR15294:2000(E) Foreword ISO(theInternationalOrganizationforStandardization)andIEC(theInternationalElectrotechnical Commission) formthespecializedsystemforworldwidestandardization.NationalbodiesthataremembersofISOorIEC participateinthedevelopment ofInternationalStandardsthroughtechnicalcommitteesestablishedbythe liaison with ISO and IEC, also take part in the work. International Standards are drafted in accordance with the rulesgiven in the ISO/lEC Directives, Part3. 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 In exceptional circumstances, when a technical committee has collected data of a different kind from that which is and does not have to be reviewed until the data it provides are considered to be no longer valid or useful. Attention is drawn to the possibility that some of the elements of this Technical Report may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IECTR15294,was preparedby Joint Technical Committee ISO/IECJTC1,Information technology SubcommitteeSC6, Telecommunicationsand information exchangebetween systems. This Technical Report is technically aligned with ITU-T Recommendation V.43, but is not published as identical text. ISO/IEC 2000-All rights reserved ii ISO/IEC TR15294:2000(E) Introduction Likewise, during periods of high compression, the DTE may become overloaded with the amount of incoming data methodssuitablefortheassociatedDTEandDcE,respectively,tobeused. This Recommendation aims at giving guidelines in order to assist DTE and DCE designers in their tasks. It lists severalmechanismswhichareknowntooperatesuccessfullywithDTEsandDCEsalthoughnosinglemechanism will operate with all DTEs and DCEs, and some DTEs may not respond to any of the mechanisms described. Both thesynchronous andtheasynchronousmodes of operationareaddressed. NOTE The guidelines given in this Technical Report may not be exhaustive iv ISO/IEC 2000-All rights reserved TECHNICALREPORT ISO/IECTR15294:2000(E) Information technology Methods for data flow control at synchronous and asynchronous DTE-DCE interfaces 1 Scope data flow control capabilities in DTEs and DCEs. It also coordinates information from other Recommendations and International Standards and provides tutorial mate