1. 2002 Honours Research Project A Supporting System for The CSSE Video Wall A Supporting System for The CSSE Video Wall Monash University By Shing Kay Pan sunnyhk@yahoo.com Department of Computer Science and Software Engineering Department of Computer Science and Software Engineering

2. 2 Copyright 2002 by Shing Kay Pan Outline 1.The CSSE video wall 2.Aim 3.Project specification 4.Infrared Data Association (IrDA) 5.Methodology 6.Implementation 7.Demonstration 8.Difficulties 9.Future work 10.Conclusion

3. 3 Copyright 2002 by Shing Kay Pan 1. What is the CSSE Video Wall? A Video Conferencing facility provided by CSSE department to allow communication between Clayton & Caulfield campuses Clayton Caulfield Video Link

4. 4 Copyright 2002 by Shing Kay Pan 2. Aim of the project To provide an additional facility for the video wall users with access to mobile devices. To build an agent (or channel) that lets mobile devices at each site communicate with each other. Goals Ease of use Support for major kinds of mobile devices Minimum installation and additional hardware

5. 5 Copyright 2002 by Shing Kay Pan 3. Project specification Communication method: IrDA (Infrared Data Association) - Widely implemented on nearly every mobile device. User platform: Any mobile device - Supported by IrDA. Agent platform: Linux -Open-source nature allows kernel level modification needed in this project. Agent’s communication method: TCP/IP - Over private networks or the Internet.

6. 6 Copyright 2002 by Shing Kay Pan 4. Infrared Data Association (IrDA) Technology similar to the one used in remote control Cheap and easy to implement Widely used on mobile devices Data rate from 9.6kbps to 16Mbps Wireless technology for data communication

7. Room BRoom A PDA1PDA2 7 Copyright 2002 by Shing Kay Pan 5. Methodology - Communication model Normal point-to-point for infrared communication: Unable to communicate if out of range: PDA1PDA2 Line of sight (1or 2 meter)

8. Agent1 TCP/IP Network TCP/IP Network Agent2 8 Copyright 2002 by Shing Kay Pan 5. Methodology – IR “tunnelling” (D. Abramson, 2002) PDA1 PDA2 Room A Room B

9. 9 Copyright 2002 by Shing Kay Pan 6. Implementation - Overview TCP/IP Network TCP/IP Network irtunnel Lower layer Upper layers IR adpater PDA1 irtunnel Lower layer Upper layers IR adpater PDA2 IrDA stack

10. 10 Copyright 2002 by Shing Kay Pan 6. Implementation - Modification of IrDA protocol Modifications must be done on the IrDA protocol to make it: A Standard IrDA protocol will actively respond to all infrared packets it receives. receive and send infrared packets as usual; disable its response capability. But…

11. 11 Copyright 2002 by Shing Kay Pan 6. Implementation - Main program (irtunnel) Gets infrared packets from the IrDA stack; Transmits them to the other agent using TCP/IP protocol over the network Receives data from the network Passes it to the IrDA stack to reproduce the infrared data At the same time, the program: The program:

12. 12 Copyright 2002 by Shing Kay Pan 7. Demonstration Agents- Two PCs, one at Caulfield and the other at Clayton with customised Redhat Linux 7.2 installed Connected through the school network Actisys 220+ has been used for infrared transmission of the agent PocketPCs (iPaq) are being used as the user platform

13. 13 Copyright 2002 by Shing Kay Pan 8. Difficulties experienced: Short transmission range - Increase transmission range by using customised infrared adapter Speed changing problem (Limited speed: 9.6kbps) - Support dynamic multi-speed Propagation delay on slow networks - Use a faster protocol instead of TCP/IP (i.e. UDP)

14. 14 Copyright 2002 by Shing Kay Pan 8. Difficulties experienced: PDA1 Agent1 TCP/IP Network TCP/IP Network Agent2 PDA2 PDA3PDA4 Multi-user at the same site problem

15. 15 Copyright 2002 by Shing Kay Pan 9. Future work Increase transmission range by using customised infrared adapter Support dynamic multi-speed Use a faster protocol instead of TCP/IP (i.e. UDP) Package as a standalone embedded device Use Bluetooth instead of IrDA

16. 16 Copyright 2002 by Shing Kay Pan 10. Conclusion Supporting system for the CSSE Video Wall developed The project has exploited the usability of infrared applications Possibility of application to other areas (i.e. home, business)

17. The End