Access Grid


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Access Grid

  1. 1. High-speed Network Projects Tibor Gyires School of Information Technology Illinois State University BIAC/TAB Meeting October 17, 2003
  2. 2. <ul><li>Contents </li></ul><ul><li>Traditional Collaborative/Teleconferencing Systems </li></ul><ul><li>Collaboration via the Grid </li></ul><ul><li>Network Performance Measurements </li></ul>
  3. 3. 1. Traditional Collaborative/Teleconferencing Systems <ul><li>Use anywhere; ubiquitous </li></ul><ul><li>Uses Internet </li></ul><ul><li>Low installation cost </li></ul><ul><li>No usage cost </li></ul><ul><li>Decentralized control </li></ul><ul><li>H.323/350 standards </li></ul><ul><li>Require a Multipoint Control Unit (MCU), gatekeepers, etc. </li></ul><ul><li>Needs a special room </li></ul><ul><li>Uses ISDN telephone lines </li></ul><ul><li>High installation cost </li></ul><ul><li>High usage cost </li></ul><ul><li>Scheduled in advance </li></ul><ul><li>Professional operator </li></ul><ul><li>Centralized control </li></ul><ul><li>H.320 standard </li></ul>Internet (PC based or Standalone) Traditional
  4. 4. Technologies <ul><li>POTS, ISDN, T-1, microwave, Satellite, and IP </li></ul><ul><li>Point-to-Point Multipoint </li></ul>Some popular tools are: H.323 based Hardware Assist, OpenH.323, Software Clients, VRVS, MPEG, Motion JPEG (MJPEG), Access Grid, Web Clients, etc.
  5. 5. 2. Collaboration via the Grid <ul><li>Grid: A heterogeneous complex of advanced networks, computers, storage devices, display devices, and scientific instruments. </li></ul><ul><li>NSF’s Cyberinfrastructure: An integrated system of interconnected computation, communication, and information elements that supports a range of applications. </li></ul><ul><li>“Cyberinfrastructure is the means; e-Science is the result.” </li></ul>
  6. 6. Access Grid <ul><li>A suite of hardware and software that supports collaboration via high-speed networking. </li></ul><ul><li>Contains high-end audio and visual technology needed to provide a high-quality compelling user experience. </li></ul><ul><li>Remote application and data sharing. </li></ul><ul><li>Any site can transmit as many streams as suit their needs. </li></ul><ul><li>It uses IP-multicast for the transport mechanism eliminating the need for a Multipoint Control unit (MCU). </li></ul><ul><li>It is based on free available standards and open-source software. </li></ul>
  7. 7. Access Grid (cont.) <ul><li>Enables groups of collaborators to increase productivity by reducing the work involved in finding expert resources, people, publications, source code, data and computing resources. </li></ul><ul><li>Used for classroom lectures, training, invited talks, and collaborative activities, such as strategy and management meetings. </li></ul>
  8. 8. Virtual Venues <ul><li>In order for a person or a group to communicate with another person or group, both persons or groups can meet in a virtual venue room. </li></ul><ul><li>There are many virtual venue rooms available. </li></ul><ul><li>Some venues require reservations. </li></ul>
  9. 9. Wide Range of Configurations <ul><li>Personal node with compact display and a single video and audio stream. </li></ul><ul><li>Room node with multiple desktop computers and projectors. </li></ul><ul><li>Advanced node with tiled displays and multiple video streams. </li></ul>
  10. 10. Personal Nodes <ul><li>A minimal node has a compact display, single video stream, and single audio stream (e.g., a handheld device). </li></ul><ul><li>A laptop node has a laptop display, minimum number of video streams, and single audio stream. </li></ul><ul><li>A desktop node has a desktop monitor, some number of video streams, and a single audio stream.  </li></ul>
  11. 11. Personal Node Scenario <ul><li>Each person has an Access Grid node configured on his or her laptop and all the participants navigate to the same venue.  </li></ul><ul><li>They have unique PowerPoint and Excel files located on their laptop that they wish to share with the group.  </li></ul><ul><li>Their files will all appear on the venue client window and they can open each file and see each other’s files on their laptop.  </li></ul><ul><li>One or more participants can control the application while everyone else watches.   </li></ul>
  12. 12. Room-based Node Scenario <ul><li>Demo </li></ul><ul><li>Video capture and audio processing run on one or more Linux operating system computers.  </li></ul><ul><li>Multiple users have a shared display, multiple video streams, and a single audio stream. </li></ul><ul><li>A large display area (often projected onto a screen or wall), with 3 projectors, and microphones and cameras. </li></ul>
  13. 13. Remote Group Interactions <ul><li>Small, informal meetings that a manager calls rapidly. </li></ul><ul><li>Large meetings planned in advance. </li></ul><ul><li>Training sessions, seminars, and classes. </li></ul><ul><li>Project and program reviews with other units </li></ul><ul><li>Medium-to-large conferences. </li></ul>
  14. 14. Advantages <ul><li>Substantially reduce travel. </li></ul><ul><li>Hold regular meetings nationally or worldwide without leaving our offices. </li></ul><ul><li>Real-time access to a worldwide community of teachers, experts, researchers who collaborate over the Access Grid, both within an organization, at universities, and in industry. </li></ul>
  15. 15. Personal Node
  16. 16. Room Node
  17. 17. Room Node (cont.)
  18. 18. Room Node (cont.)
  19. 19. An Access Grid Room
  20. 20. Computing Equipment <ul><li>The Display Computer is responsible for video decoding and running applications on the Display Screen. </li></ul><ul><li>The Video Capture Computer is responsible for the software compression of multiple video streams. </li></ul><ul><li>The Control Computer is to run the control software for the Gentner echo cancellation hardware. </li></ul>
  21. 21. Video Capture Computer
  22. 22. Audio System
  23. 23. Display Computer
  24. 24. Media Equipment <ul><li>Audio processing hardware, microphones, speakers, video cameras, etc. </li></ul>
  25. 25. Matchmaker <ul><li>Matchmaker matches semi-pro, industrial and consumer audio equipment into professional balanced systems: </li></ul>
  26. 26. Projection Equipment <ul><li>Projectors and Screen </li></ul><ul><li>A minimum of three projectors is recommended to provide adequate display space for AG images with at least 1024x768 pixel resolution. </li></ul><ul><li>WallTalker Like a wallpaper used as a non-reflecting projector display screen. Using a special felt pen, a presenter can write on it and erase it like a white board. </li></ul>
  27. 27. Bandwidth Considerations <ul><li>Peer-to-peer relationship; all users can stream to all other users. </li></ul><ul><li>10 Mb/sec will typically support a meeting with three AG nodes. Each additional participating AG node will consume roughly 2 Mb/sec of IP multicast bandwidth. </li></ul><ul><li>Video codecs only send changes of the image. A room with little motion will have high-quality images on little bandwidth, while a room with many changes will consume more bandwidth and may have poorer quality. </li></ul>
  28. 28. Connections <ul><li>A multicast enabled 100bT connection to the node hardware is required and at least DS3 bandwidth to the Internet from the node is recommended. </li></ul>
  29. 29. Platforms <ul><li>The Access Grid Toolkit 2.1 supported platforms: </li></ul><ul><li>RedHat Linux, Microsoft Windows2000, XP, Mac OS. </li></ul><ul><li>Personal node installation of Access Grid: </li></ul><ul><li>Personal Interface Grid (PIG) Toolkit 2.1 on Windows. </li></ul>
  30. 30. Applications <ul><li>Distributed, collaborative college courses. </li></ul><ul><li>Guest lecturer in a course. </li></ul><ul><li>Collaborative students’ projects. </li></ul><ul><li>Distributed Network Modeling and Simulation. </li></ul><ul><li>Co–teaching a course. </li></ul><ul><li>Participating in Megaconferences (Universities and organizations from throughout the country or other countries), etc. </li></ul>
  31. 31. 3. Other Projects <ul><li>End-to-end Performance Evaluation and Analysis </li></ul><ul><li>Measure and better understand the characteristics of the traffic generated by high-speed network applications. </li></ul><ul><li>Quality of Service </li></ul><ul><li>The goal is to evaluate and measure the performance of various QoS solutions. </li></ul><ul><li>Security </li></ul><ul><li>The research will focus on the security services that can be used on campuses. </li></ul>
  32. 32. ITK High-speed Networking Lab
  33. 33. References <ul><li>[1] Robert S. Dixon, “Internet Videoconferencing; Coming to Your Campus Soon!”, Educause Quarterly, Number 4, 2000 </li></ul><ul><li>[2] </li></ul><ul><li>[3] </li></ul><ul><li>[4] </li></ul><ul><li>[5] </li></ul>