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5 Written questions

4 Multiple choice questions

  1. ---
  2. 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.
  3. A cell is an area covered by a cellsite with antenna and equipment to serve mobile phones in the cell. The MTSO coordinates activity among the cellsites. It connects wired customers via a POP.
  4. 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 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. 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.

          

  3. Compare GSM and CDMA. Where are they dominant? What advantage does CDMA have in terms of channel usage?Analog is electrical signals made from pressure waves.Digital is either on or off.

          

  4. 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

          

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