Questions on Telephony and ISDN.
  1. How does an 'End Office' distinguish between local calls and long distance calls?
  2. What is the function of a Codec?
  3. Describe the three main transmission line problems.
  4. How does the cable TV company solution and the telephone company solution for FTTC differ?
  5. What bandwidth is available to the user on a typical voice grade telephone channel?
  6. Why was 125Micro Seconds selected as the sampling time for the incoming line at an end office?
  7. What are the four main SONET design goals?
  8. What is the main disadvantage of telephone switching systems for computer networking?
  9. What methods do modems use to transfer data at speeds greater than 2400bps?
  10. What is in band signalling?
  11. What is the aim of ISDN?
  12. Give two examples of non-voice services ISDN will provide.
  13. What is the name of the ISDN connector which supplied to the home or small office?
  14. Which combinations of ISDN channels have the CCITT standardised?
  15. What is N-ISDN?