ISO INTERNATIONAL STANDARD 22669 Fourth edition 2021-06 Space data and information transfer systems Space link extension (SLE) Return-all-frames service specification Systemes detransfertdes donneesetinformations spatiales- Extension de liaisons spatiales (SLE)-Service deretour par tout reseau Reference number ISO 22669:2021(E) ISO @IS02021 IS0 22669:2021(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 on the internet or an intranet, without priorwritten permission.Permission can be requested from either IsO at theaddress 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: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS0 2021 -All rights reserved