JEC IEC 62783-1-2 Edition 1.02025-09 INTERNATIONAL STANDARD Twinaxcablesfordigital communications Part 1-2:Time domaintest method for twinax cables for digital communications - Impedance IEC 62783-1-2:2025-09(en) ICS 33.120.20 ISBN 978-2-8327-0706-7 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @2025 IEC, Geneva, Switzerland 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 IEc or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Secretariat Tel.: +41 22 919 02 11 3, rue de Varembé [email protected] www.iec.ch CH-1211 Geneva 20 Switzerland About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. AboutIECpublications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigendum or an amendment might have been published. IECpublications search- IECProducts &ServicesPortal-products.iec.ch webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the The advanced search enables to find IEC publications by a variety ofcriteria (reference number, text, With a subscription you will always have access to up to technical committee,...):It also gives information on date content tailored to your needs. projects, replaced and withdrawn publications. Electropedia - www.electropedia.org IEC JustPublished-webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology. Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English details all new publications released. Available online and and French, with equivalent terms in 25 additional languages. Also known as the International Electrotechnical Vocabulary once a month by email. (IEV) online. IECCustomerServiceCentre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: [email protected]. Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor. IEC62783-1-2:2025@IEC2025 CONTENTS FOREWORD INTRODUCTION. 1 Scope. 2 Normativereferences 3 Terms and definitions 4 Principle of differential time domain measurement. .6 5 Test equipment and accessories.. 6 Measurement method... 6.1 6.1.1 6.1.2 Method A: coaxial calibration kits.. ..10 6.1.3 Method B: air line and standard terminations .. 10 6.2 Rise time of measurement system... 11 6.3 DUT length . 11 6.4 Measurement. 11 7 Requirement. 12 8 Test report. .12 Bibliography. .13 Figure 1 - Fall time.. .6 Figure 2 - Illustration of signal flow and reflected impedance in time domain... Figure 3 - Illustration of three typical reflection coefficients in time domain ... Figure 4 - Pl model and T model of a symmetrical transmission line impedance.... Figure 5 - Calibration method B.... ...10 IEC62783-1-2:2025@IEC2025 INTERNATIONALELECTROTECHNICALCOMMISSION Twinax cables for digital communications - Part 1-2: Time domain test method for twinax cables for digital communications-Impedance FOREWORD 1)The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees).The object of iEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes Internat