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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. 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. Pulse code modulation is the signal being sampled 8,000 times per second. Each sample is 1/8000 of a second. Each sample period, the amplitude of the signal is sampled. Each filter can distinguish 256 loudness levels.Produces 8 bits per sample.
  4. GSM is dominant in Europe and Asia. CDMA is dominant in the US. CDMA can use the same channel in adjacent cells, providing more channel reuse and so more customers.

4 True/False questions

  1. Compare voice and data traffic; How are circuit switching and packet switching used with voice and data traffic? Why?Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.

          

  2. 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

          

  3. What media are used for the local loop?DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.

          

  4. 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.