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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. Customer premises Equipment consists of telephones, wires, and other infrastructure on the customer premises. Most business have a PBX. It acts like switchboard. Local Loop- the access line to the customer. Transport-Carriage of voice during a conversation
  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. 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.


  2. Define telephone modem, DSL, cable modem, 3G cellular, WiMax, Satellite Internet, broadband on power lines, and fiber-to-the-homeConverts 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. 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. What media are used for the local loop?DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.


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