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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. DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
  3. Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.
  4. Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.

4 True/False Questions

  1. Where are analog and digital signals used in the PSTN?Analog is electrical signals made from pressure waves.Digital is either on or off.


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


  3. What is a cellular telephone cell? What functions does the mobile telephone switching office serve?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. Compare DSL and cable optionsADSL 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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