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5 Written questions

4 Multiple choice questions

  1. 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. DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
  3. 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. 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.

4 True/False questions

  1. Define circuit switching and compare with packet switchingADSL 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. Compare DSL and cable optionsDAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.

          

  3. What is a cellular telephone cell? What functions does the mobile telephone switching office serve?Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.

          

  4. 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.

          

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