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5 Written questions

4 Multiple choice questions

  1. 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.
  2. 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.
  3. Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
  4. DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.

4 True/False questions

  1. What is pulse code modulation? When is it used?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. Define circuit switching and compare with packet switchingCircuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.

          

  3. Compare voice and data traffic; How are circuit switching and packet switching used with voice and data traffic? Why?Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.

          

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