ISO INTERNATIONAL STANDARD 11992-1 Third edition 2019-05 Road vehicles Interchange of digital information on electrical connections between towing and towed vehicles Part 1: Physical and data-link layers Vehicules routiers - Echange d'informations numeriques sur lesconnexionsélectriquesentrevehiculestracteursetvehicules tractés Partie 1: Couche physique et couche de liaison de données Reference number ISO 11992-1:2019(E) rso @ IS0 2019 IS0 11992-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 11992-1:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..2 4 Abbreviated terms ..4 5 Data link layer (DLL) .4 5.1 General. .4 5.2 DLL protocol entity requirements .4 5.3 DLL device interface requirements .4 6 Physical layer (PHY) 5 6.1 General. .5 6.2 Physical signalling (PS) requirements 5 6.2.1 General. .5 6.2.2 PS entity requirements. 5 6.2.3 Ps device interface requirements .5 6.3 Physical medium attachment (PMA) requirements .6 6.3.1 PMAentityrequirements ..6 6.3.2 PMA device interface requirements. .13 6.4 Physical media dependent (PMD) sub-layer requirements .14 6.4.1 PMD entity requirements. ..14 6.4.2 PMD device interface requirements. .14 6.5 Network wiring harness system requirements ..16 Annex A (informative) Implementation examples of the bus failure management .20 Bibliography .22 @ IS0 2019 - All rights reserved ii