TECHNICAL ISO/TR REPORT 16056-2 First edition 2004-07-01 Health informatics Interoperability of telehealth systems and networks - Part 2: Real-time systems Informatique de santeInteroperabilite des systemes et des réseaux detelésanté- Partie 2: Systemes en temps réel Reference number ISO/TR 16056-2:2004(E) @ ISO 2004 ISO/TR16056-2:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but downloading this file, parties accept therein the respons bility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @IsO2004-Allrights reserved ISO TR 16056-2:2004(E) Contents Page Foreword. v Introduction. vi Scope... 2 NormativeReferences. 3 Terms and definitions .. 2 Abbreviations. 12 4 5 Multimedia Conferencing Standards . 5.1 13 5.2 H.320recommendations 5.3 H.321 and H.310 Recommendations 5.4 H.323Recommendations 5.4.1 H.323 Terminals . 19 5.4.2 Gateways. 21 5.4.3 Gatekeeper 21 5.4.4 Multipoint control unit 21 5.5 H.324 Recommendations 5.6 T.120 Recommendations 23 5.6.1 T120 Overview.... 23 5.6.2 T.120 Layer composition 23 5.6.3 T.120Interoperability. 24 6 Telehealth applications 24 6.1 General.... 24 6.2 Telelearning .... 25 6.3 Teleconsultation 26 1 Interoperability issues .28 7.1 28 7.2 Standard-related sources of interoperability issues.. 28 7.2.1 Looseadaptationofpreviousprotocols... 29 7.2.2 Loosely defined encoding and decoding methods.. 29 7.2.3 Inconsistent definition of mandatoryloptional requirements . 29 7.2.4 Gapsintherecommendations. 7.2.5 No specifications for data encoding in the H.320/H.323 Recommendations 30 7.2.6 Evolving T.120 Recommendations... Loosely defined specifications for an McU 7.2.7 30 7.2.8 Evolving/undefined specifications for Gateways and Gatekeepers 30 7.2.9 Loosely defined bandwidth management.... 31 7.2.10 Poor standardization of media conferencing .... 31 7.3 Product-related Sources of Interoperability Issues .... 7.3.1 Timedelaybetweenthestandards(ever-evolving)andproducts. 31 7.3.2 Implementationofadifferentsubsetofthestandards.... 32 7.3.3 Proprietarysolutions... 32 7.4 Implementation-related sources of interoperability issues.... 32 7.4.1 32 UndefinedspecificationsforGatekeeperCommunication.. 7.4.2 Gateway to Gatekeeper Communication... 32 7.4.3 A decentralized multipoint conference ... 33 8 Interoperability requirements .. 33 8.1 General. 33 8.2 Call Setup.. 34 8.3 Acquisition, processing, and transmission of multimedia data 35 8.4 Controlling near- and far-end devices ... 36 @ISO 2004-All rights reserved ili ISO TR 16056-2:2004(E) 8.5 Call termination. 36 9 Interoperability in heterogeneous telehealth networks . 36 9.1 General 36 9.2 Interoperability of H.320 systems over frame relay network. 36 9.3 Interoperability of h.3xx-compliant systems over heterogeneous networks 9.3.1 Gatekeeper functions.. 38 9.3.2 Mcu functions............ 39 9.3.3 Design requirements - Telehealth solutions .. 1o Framework for interoperable architectures 10.1 General .41 10.2 Telehealth component boundaries .41 10.2.1 User interface.... 41 10.2.2MedicalDevices 10.2.3 Data manage