Chapter Questions
What types of light source are used with fiber systems?
What is the refractive index? What does its value indicate?
What is pulse dispersion?
How is light energy converted back into electrical energy?
Discuss the primary advantage associated with the use of lightwave division multiplexing.
What is an optical modem?
Discuss five advantages obtained from the use of a fiber-optic transmission system.
What are two limitations to the widespread use of fiber-optic systems?
Why is it costly to extract a DS0 signal from a DS3 signal on a T3 carrier?
Discuss why SONET enables individual-DSOs to be extracted from a high speed digital signal without demultiplexing.
What is the difference between a linear and ring-based SONET deployment with respect to reliability?
Discuss the operation of the two types of SONET rings.
Compare and contrast FDMA and TDMA.
Discuss four advantages obtained by the use of satellite communications.
What types of application are best suited for satellite communications?
Why are cellular systems structured to preclude the use of the same frequency in adjacent cells at the same time?
Discuss the cell capacity of AMPS, TDMA and CDMA wireless systems with respect to one another.
What are the three components of a wireless cellular system?
Why are more cell sites required to support PCS than a TDMA system within the same geographic area?
Describe three constraints associated with transmitting data over current wireless cellular systems.
Describe the three physical layer transmission methods supported by the IEEE 802.11 wireless LAN standard.
Describe two applications for wireless LANs.