TTMER34: VoIP traffic measurement on ADSL line

Control questions

You must give an answer to 5 questions at the beginning of the laboratory exercise. One wrong answer will make the mark given to the measuring with one grade worse. Two or more wrong answers will result a supplementary measuring!

  1. Delineate the model of the ADSL digital subscriber transmission system!
  2. Delineate line layer of the ADSL U interface (modulation, spectrum, main parameters)!
  3. Delineate channel layer of the ADSL U interface (bearer channels, transmission route)! What does dual latency mean?
  4. Delineate main parameters of the ADSL line layer!
  5. Explain, how can differ from each other ADSL over ISDN and ADSL over POTS?
  6. Delineate shortly, how can differ from each other Skype, H.323 and SIP?
  7. What is the role of the "supernode" in the Skype?
  8. Delineate process of the access of the Skype-client to the network!
  9. Skype uses different codec settings between two Skype clients, and at the call, that leaves the network. In what issues can they differ from each other?
  10. What the Skype API is used for?