IEC IEC61156-1 Edition 4.0 2023-03 REDLINE VERSION INTERNATIONAL STANDARD colour nside Multicore and symmetrical pairlquad cables for digital communications - Part 1: Generic specification IEC 61156-1:2023-03RLV(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2023 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, piease 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] CH-1211 Geneva 20 www.iec.ch 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. About IEC publications latest edition,a corrigendum oran amendmentmighthavebeen published IEcpublicationssearch-webstore.iec.ch/advsearchform IEcProducts&ServicesPortal-products.iec.ch The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the technical varietyof criteria (reference number, text, publications previews.Witha subscriptionyouwill always have committee, ...). It also gives information on projects, replaced access to up to date content tailored to your needs. and withdrawn publications. Electropedia-www.electropedia.org IEc Just Published-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 22 300 terminoiogical entries in English details all new publications released.Available online and once and French, with equivalent terms in 19 additional languages. a month by email. Also known as the International Electrotechnical Vocabulary (IEV) online IEc Customer Service Centre - 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]. IEC IEC 61156-1 Edition 4.0 2023-03 REDLINE VERSION INTERNATIONAL STANDARD colour inside Multicore and symmetrical pair/quad cables for digital communications Part 1: Generic specification INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.120.20 ISBN 978-2-8322-6666-3 Warning! Make sure that you obtained this publication from an authorized distributor. ? Registered trademark of the International Electrotechnical Commissior