# Chpter3 review.txt

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The flashcards below were created by user cbai on FreezingBlue Flashcards.

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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 Author: cbai ID: 122763 Filename: Chpter3 review.txt Updated: 2011-12-11 21:40:49 Tags: Net centric Folders: Description: Chapter 3 review questions Show Answers:

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