1. “ACT” Audio Conference over ATM Network with TRM Technion - Israel Institute of Technology Electrical Engineering Faculty Computer Networks Laboratory Under the supervision: Youval Nahum Remus Koos Michael Moreinis Michael Maziar

2. Project Goals Building the Audio Conference Manager Implementation of Server-Client Messages Communication Channels Client-Server Relationship Structure Instructions: Delete sample document icon and replace with working document icons as follows: Create document in Word. Return to PowerPoint. From Insert Menu, select Object… Click “Create from File” Locate File name in “File” box Make sure “Display as Icon” is checked. Click OK Select icon From Slide Show Menu, Select Action Settings. Click “Object Action” and select “Edit” Click OK

3. Description There is a significant need in fast & reliable communication over computer networks One of the communication implementations is AUDIO CONFERENCING In order to run the AUDIO CONFERENCE convenient, the manager should be implemented The ATM Network doesn’t support reliable connection - there is a need for IP control connections. Instructions: Delete sample document icon and replace with working document icons as follows: Create document in Word. Return to PowerPoint. From Insert Menu, select Object… Click “Create from File” Locate File name in “File” box Make sure “Display as Icon” is checked. Click OK Select icon From Slide Show Menu, Select Action Settings. Click “Object Action” and select “Edit” Click OK

4. Competitive Analysis Others Audio Conferencing tools –Slow communication –No manager implemented Audio conference with TRM –Audio Transfer over ATM - fast communication –TRM - fair management Weaknesses of ACT –No user interface (at this point) –No additional tools (whiteboard, video etc.) Instructions: Delete sample document icon and replace with working document icons as follows: Create document in Word. Return to PowerPoint. From Insert Menu, select Object… Click “Create from File” Locate File name in “File” box Make sure “Display as Icon” is checked. Click OK Select icon From Slide Show Menu, Select Action Settings. Click “Object Action” and select “Edit” Click OK

5. Technology ATM Networks –fast communication –large data (audio) - low latency TRM - time resource manager –fairness in time allocation –no interference to speaker IP control connections –reliable connection (necessary for control) –standard communication protocol Instructions: Delete sample document icon and replace with working document icons as follows: Create document in Word. Return to PowerPoint. From Insert Menu, select Object… Click “Create from File” Locate File name in “File” box Make sure “Display as Icon” is checked. Click OK Select icon From Slide Show Menu, Select Action Settings. Click “Object Action” and select “Edit” Click OK

6. Hardware/Software Resources Sun Workstations ATM Network cards FORE/ATM Native ATM API SUN Audio tools - AudioRecord - AudioPlay - AudioTool - set the audio devices

7. Communication Channels Another channel is MULTICAST ATM connection from server to each client

8. Request Queue Each client may have one request only Time allocation is equal to all clients

9. Link List of Conference Participants New participant - new member of LL is created Participant is down - member of LL is deleted, Request Queue is updated

10. Client Software Each Client runs number of threads The treads cannot be switched by user Need for data locks

11. Server Software Audio Buffer Global Data Locks

12. Server-Client Messaging Client Requests –demand –remove –exit Client Messages –start –stop –exit –conference state messages

13. Server-Client Messaging Server Statistics –Clients connected –Request queue Server Timing –Set-up the conference –Conference timing –Conference state messages

14. Conclusions Audio Devices –Easy to implement –Low quality –High Latency ATM Networks –Fast –Unreliable connection –Convenient for large data transfer TRM –Improves the performance –Fairness & Convenience –Order in Conference