1. T.Sharon-A.Frank Distributed Education Video Conferencing

2. 2 T.Sharon-A.Frank Contents What’s the idea? Conferencing aspects VC Dimensions VC Layered Architecture VC Standards

3. 3 T.Sharon-A.Frank What’s the Idea?

4. 4 T.Sharon-A.Frank What is it used for? Social Encounters Job Interviews Business Meetings Distance Learning Medical Consultation

5. 5 T.Sharon-A.Frank Conference Types Chat Conference (IRC, Chat) Audio Conference (WebPhones) Video Conference (VC Tools) –Bi-party Conference –Multiparty Conference (Reflector, MeetingPoint): »Group Communication »Needs Floor Control

6. 6 T.Sharon-A.Frank Multimedia Conference via Skype

7. 7 T.Sharon-A.Frank The Meeting Room Conference

8. 8 T.Sharon-A.Frank VC Hardware Cameras Screens Speakers and Microphones Other Aids (Electronic Board, Remote Control)

9. 9 T.Sharon-A.Frank VC Software/Tools Chat Video/Audio tools Whiteboard Data/File Transfer Application Showing Application Sharing

10. 10 T.Sharon-A.Frank Whiteboard

11. 11 T.Sharon-A.Frank Conference Configuration Video card Communication

12. 12 T.Sharon-A.Frank VC Network

13. 13 T.Sharon-A.Frank Network Conferencing SCN Switched Circuit Network (SCN) Internet LAN TCP/IP

14. 14 T.Sharon-A.Frank VC Dimensions Networking System Types Infrastructure Packet-switched Networks Circuit-switched Networks Desktop Roll-about Meeting rooms Hardware oriented Software oriented

15. 15 T.Sharon-A.Frank VC Networking Circuit-Switched Networks –POTS –ISDN Packet-Switched Networks –LAN –WAN

16. 16 T.Sharon-A.Frank VC System Types Meeting Rooms Roll-about Personal (Desktop)

17. 17 T.Sharon-A.Frank VC Systems Examples Meeting Rooms Systems: –VTEL TC2000 –PictureTel Concorde 4500 Roll-about Systems: –VTEL F.R.E.D –PictureTel Swiftsite Personal (Desktop) Systems: –MS NetMeeting –CU-SeeMe

18. 18 T.Sharon-A.Frank VC Layered Architecture User Interface Tools/Utilities Video Codecs Audio Codecs Hardware Devices Communication Infrastructure

19. 19 T.Sharon-A.Frank Architectural Aspects Audio aspects –Appropriate Codecs –Half/Full Duplex –Echo –Delay Video aspects –Appropriate Codecs –Frame size (SQCIF, QCIF, CIF) –Delay/Jitter General aspects –Call Control –Channels and Multiplexing –Synchronization (lips- synch) –Group Communication (floor control, Multicasting) –Quality of Service (QoS)

20. 20 T.Sharon-A.Frank Voice Quality - QoS The Objective: Provide unfailing, ubiquitous, toll quality service 0 200 400 160 01510 Service Level Agreement Violation Area of Unacceptable Operation One-Way Delay (ms) Marginal Acceptance Acceptable Operation Packet Loss (%) high thresholdlow threshold The Challenge: Eliminate the impact of delay-insensitive traffic on real-time traffic

21. 21 T.Sharon-A.Frank QoS Parameters Delay Budgets

22. 22 T.Sharon-A.Frank VC Standards Overall Standards: H.320, H.323, H.324 Call Control: H.245 Video Codecs: H.261, H.263, M-JPEG Audio Codecs: G.7XX Data Conferencing: T.120

23. 23 T.Sharon-A.Frank TelePresence Conference Set of technologies allowing a person to feel as if they were present, at a location other than their own one. Requires good lighting and screens installed with speakers. Transmits the user's position, movements, and voice to the remote location. Enables the same transfer for both ends, allowing interactive dialogue. Delivers an 'in person' experience, allowing meetings without travelling.

24. 24 T.Sharon-A.Frank An Example TelePresence Conference