Chpter3 review.txt

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Author:
cbai
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122763
Filename:
Chpter3 review.txt
Updated:
2011-12-11 16:40:49
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Chapter 3 review questions
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  1. Differentiate between guided media and unguided media.
    With guided media, the electromagnetic waves are guided along an enclosed physical path whereas unguided media provide a means for transmitting electromagnetic waves but do not guide them.
  2. Differentiate between an analog and a digital electromagnetic signal.
    A continuous or analog signal is one in which the signal intensity varies in a smooth fashion over time while a discrete or digital signal is one in which the signal intensity maintains one of a finite number of constant levels for some period of time and then changes to another constant level.
  3. What are three important characteristics of a periodic signal.
    Amplitude, frequency, and phase are three important characteristics of a periodic signal.
  4. What is the relationship between the wavelength and frequency of a sine wave.
    The relationship is ?f = v, where ? is the wavelength, f is the frequency, and v is the speed at which the signal is traveling.
  5. Define fundamental frequency.
    The fundamental frequency is the lowest frequency component in the Fourier representation of a periodic quantity.
  6. What is the relationship between a signal's spectrum and its bandwidth.
    spectrum of a signal is the frequencies it contains while the bandwidth of a signal is the width of the spectrum.
  7. What is attenuation?
    Attenuation is the gradual weakening of a signal over distance.
  8. Define channel capacity.
    The rate at which data can be transmitted over a given communication path, or channel, under given conditions, is referred to as the channel capacity.
  9. What key factors affect channel capacity?
    Bandwidth, noise, and error rate.

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