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Distributed Teaching Environment

Learn how to configure video conferencing tools on a computer network in a distributed teaching environment at TTU, using tools like vic, rat, and Connectix QuickCam. Understand the requirements, conditions, and equipment needed for a successful setup.

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Distributed Teaching Environment

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  1. Distributed Teaching Environment Avo Ots, Marika Kulmar

  2. Task

  3. Configuration on computer network VI 229 VI 124 TTU network

  4. Configuration of MS Powerpoint • Tools->Presentation Conference ... • Presenter - computer in room VI 229 • Audience - computer in room VI 124 • Using Windows network addresses (NetBIOS name) or IP addresses.

  5. Requirements and conditions • Requirements • max penetration of image • max resolution of image • Conditions • writing to white paper in black pen • using network 10 Mb/s Ethernet CSMA/CD • not to prevent other network users in TTU public network to use network resourses

  6. Used Cameras • Connectix QuickCam (LPT and PS/2 ports) • Creative WebCam 3 USB • AV Master card, which can connect PAL videocamera to computer

  7. Connectix QuickCam • Max capabilities: image size 320x240 px, black&white - 64 greys, 30 frame per second average frame size about 76800 Bytes • Creative WebCam 3 is on the picture which is made by Connectix QuickCam

  8. Creative WebCam 3 USB • Max capabilities: image size 640x480 px, 15 fps, color RGB 24. average frame size about 921600 B. • Connectix QuickCam is on the picture which is made by Creative WebCam 3

  9. AV Master video capture card • Max capabilities: image size 768x576 px frame compression 4:1 (stream 5,5 Mbps) ... 100:1

  10. AV Master kaart (2) • Picture is made by Creative WebCam • On the picture there is AV Master card in the computer connected with Sony camera.

  11. Used software tools • sdr (Session DiRectory) - Session management • vic (Video Conferencing Tool) - video stream • rat (Robust Audio Tool) - audio stream

  12. Configuration of vic • vic = Video Conferencing Tool • point-to-point or multicast • works over IP • runs on many operating systems: (Solaris, SunOS4, Irix 6.2, Linux, FreeBSD, Windows) • running: vic [options] <address/port> • Statistics

  13. Vic’i konfiguratsioon (2) • Point-to-point or multicast: • point-to-point commandline: vic [options] <address_of_other_computer/port> • multicast commandline: vic [options] <multicast_address/port> • port 5002 or upper

  14. Vic’i konfiguratsioon (3) • Frames per second • bits per second transmitted/received • percent of loss

  15. Vic’i statistics examples • Graphical statistics • kilobits • frames • packets • missing

  16. Vic and Creative WebCam • Jpg • 640x480 • SCIF

  17. SDR (Session Directory) • Create sessions • manage sessions • management of multicast IP addresses/ports • advertise sessions

  18. Rat (Robust Audio Tool) • Audio stream • send/receive • unicast, multicast • statistics

  19. Used in shows • Autumn term of season 2000/2001 once and twice in a week for TTU basic course “Communication” between 2 auditorios and later audio multicast to internet for internet users.

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