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5 Written Questions

4 Multiple Choice Questions

  1. 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.
  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. Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
  4. Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.

4 True/False Questions

  1. Where are analog and digital signals used in the PSTN?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.

          

  2. What media are used for the local loop?1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber

          

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

          

  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.

          

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