ISO INTERNATIONAL STANDARD 22671 Fourth edition 2021-06 Space data and information transfer systems - Space link extension (SLE) Forward communications link transmission unit (CLTU) service specification Systemes de transfert des informations et données spatiales- Extension de liaisons spatiales (SLE) - Service de I'unite de transmission pour la liaison d'envoi de télécommande (CLTU) Reference number IS0 22671:2021(E) ISO ISO2021 IS0 22671:2021(E) COPYRIGHTPROTECTEDDOCUMENT @IS02021 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 below or Iso's member body in the country of the requester. IsO copyrightoffice CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved