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5 Written questions

4 Multiple choice questions

  1. Converts digital computer signals to analog and sent over telephone lines. 3G is for sending data faster with a speed 2-3 Mbps. WiMAX is to replace DSL, Cable and cellular service with 1-4 Mbps. Satellite is very expensive because of long transmission distance. Two way data transmission is expensive. Some carriers are pushing fiber directly to the home with 100 Mbps or more.
  2. Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.
  3. 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber
  4. ADSL uses 1 VG UTP lines. Cable uses optical fiber to the neighborhood with thick coaxal cables. Thin coaxial drop cables go to the residences.

4 True/False questions

  1. Describe the general structure of the PSTN - local loop, transport core, trunk line1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber

          

  2. What is DAC? ADC?ADSL uses 1 VG UTP lines. Cable uses optical fiber to the neighborhood with thick coaxal cables. Thin coaxial drop cables go to the residences.

          

  3. What is the thrust of Nyquist's formula? (Sampling rate should be twice the bandwidth)---

          

  4. What is pulse code modulation? When is it used?1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber

          

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