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A Comprehensive Guide to Videoconferencing and Media in ICT

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A powerpoint discussing how to answer CIE Applied ICT Exam Paper 3 questions

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A Comprehensive Guide to Videoconferencing and Media in ICT

  1. 1. M/J 2010 Scenario 3<br />By Matthew Wolff<br />
  2. 2. Question 7a<br />A firm of IT consultants has designed dedicated video conferencing suites for Rock-ICT. This will enable communication between their offices in Lahore and Dubai.<br />Describe in detail how the suite would be set up.<br />
  3. 3. Answer<br />Any six points from: <br />large screen monitors/(digital) projector <br />to enable delegates a realistic view <br />high quality/HD webcam / HQ/HD webcam on each station <br /> …. that can move and zoom <br />to take images in real time to relay back to other delegates <br />several microphones/speakers/headsets <br />to enable delegates to be heard clearly <br />
  4. 4. Answer cont.<br />call up device <br />to enable access to communication link <br />delegates sit in front of screens with microphones to pick up sound <br />cameras provide wide angle view of room <br />and can be zoomed onto a speaker <br />chairperson controls meeting <br />broadband connection/satellite link to suite <br />really needs high bandwidth (NOT fast Internet)<br />
  5. 5. Examiner’s Feedback<br />This section was about the hardware and a good number of candidates gave answers about software.<br />Most scored 3 or more marks.<br />
  6. 6. Question 7b<br />A firm of IT consultants has designed dedicated video conferencing suites for Rock-ICT. This will enable communication between their offices in Lahore and Dubai.<br />They monitor worldwide television and radio transmissions via satellite systems. <br />Describe in detail the software requirements necessary to allow video conferencing to take place.<br />
  7. 7. Answer<br />Any six points from:<br />conferencing software/Skype is acceptable <br />compresses audio and video elements produced by the Input devices/microphones and webcams <br />uses CODEC <br />enables sufficient data to be transmitted quickly enough to be in real time <br />
  8. 8. Answer cont.<br />software feature to record conference <br />echo cancellation software <br />allows talking in real time to take place <br />keeps communication synchronised<br />communication software <br />to allow system access to internet/satellite link to permit transmission <br />software creating UDP packets <br />encryption software for signal<br />
  9. 9. Examiner’s Feedback<br />This section proved more difficult for the candidates and provided good discrimination.<br />
  10. 10. Question 7c<br />A firm of IT consultants has designed dedicated video conferencing suites for Rock-ICT. This will enable communication between their offices in Lahore and Dubai. However, they are also considering alternative methods of communication.<br />Rock-ICT is considering the use of VOIP and instant messaging for communications. Discuss the advantages and disadvantages of these methods compared with video conferencing.<br />
  11. 11. Answer<br />Any six points from: <br />VOIP <br />is voice over IP allowing communication over the internet <br /> disadvantages include: <br />need a special phone or headset in many cases <br />free calls can only be made if recipient uses same system <br />
  12. 12. Answers cont.<br />advantages include: <br />international/long distance calls are at local rate or even free <br />less hardware needed than with video conferencing reducing costs <br />cannot see body language/facial expression <br />
  13. 13. Answer cont.<br />instant messaging allows interaction between users across internet <br /> disadvantages include: <br />video is poor unlike VOIP (could be awarded in VOIP but only once) <br />interaction can be slow <br />poor synchronisation <br />
  14. 14. Answer cont.<br />advantages include: <br />can interact with various IP addresses <br />video can be used unlike VOIP <br />less expensive hardware needed than with video conferencing <br />only require low speed internet connection (unlike VC) <br />
  15. 15. Examiner’s Feedback<br />A popular question with candidates able to show that they understood the difference between these two applications that hey probably have experienced.<br />
  16. 16. Question 8a<br />Rock-ICT presently has a large library of CDs of music tracks and DVDs of films and television programmes.<br />Describe why Rock-ICT are converting their CD and DVD files into MP3 and MP4 format.<br />
  17. 17. Answer<br />Any three points from: <br />audio and video files are usually very large/MP3 or MP4 files are smaller <br />MP3/4 compresses files by up to 90% (needs to imply significant compression) <br />e.g. a 60Mbyte CD track becomes a 6Mbyte MP3 file <br />sound/video quality is maintained <br />normal data compression doesn’t reduce file very much and loses quality <br />allows a vast number of files to be stored on MP3/4 devices <br />
  18. 18. Answers cont.<br />faster download over Internet due to compression <br />faster downloads due to increased broadband speeds <br />it is now possibly to buy on-line and download the MP file <br />easier to store MP3 files on HD <br />....than to have lots of shelves holding disks <br />Increased storage capacity of solid state devices has increased demand for MP3 MP4 files <br />
  19. 19. Examiner’s Feedback<br />The emphasis was on the relative size of MP3 files and the growth of broadband influencing demand.<br />
  20. 20. Question 8b<br />They monitor worldwide television and radio transmissions via satellite systems.<br />Describe how a satellite television system works.<br />
  21. 21. Answer<br />Any four points from: <br />signals from tv station sent to (uplink) satellite dish …. <br />… signal is encrypted <br />… which points at broadcast satellite orbiting the Earth <br />transponder on satellite sends signal to Earth <br />where it is picked up by the receiving dish <br />
  22. 22. Answer cont.<br />shape of dish ensures signal converges on LNB (low noise blockdown) converter <br />the signal is amplified by the LNB <br />satellite receiver box converts signal understood by tv<br />signals received need to be decoded/decrypted <br />(use of a viewing card) allows decryption to be carried out<br />
  23. 23. Examiner’s Feedback<br />A good question for the majority of candidates who seemed to have good subject knowledge on the topic.<br />A satellite dish cannot transmit to a transponder in space.<br />The LNB is a passive device.<br />
  24. 24. Question 8c<br />They monitor worldwide television and radio transmissions via satellite systems.<br />Describe the advantages of using satellite-based systems rather than using terrestrial television.<br />
  25. 25. Answer<br />Any three points to both users and Rock-ICT from: <br />advantages include for the user: <br />not affected as much by weather conditions/ <br />reception not as affected by hills, tall buildings etc. can be better quality than terrestrial <br />more tv stations available/can receive programs transmitted from overseas/other side of world <br />Electronic Program Guide is much better than terrestrial <br />the dish is more compact than a large TV aerial<br />
  26. 26. Answer cont.<br />for Rock-ICT: <br />can provide more channels <br />pay to view can be implemented generating income <br />interactive shows can attract more viewers <br />programmes can be repeated filling extra channels <br />one satellite can cover a much wider area than a terrestrial system <br />
  27. 27. Examiner’s Feedback<br />An easy question for most candidates to obtain 3 marks.<br />

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