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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.
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.
What are three important characteristics of a periodic signal.
Amplitude, frequency, and phase are three important characteristics of a periodic signal.
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.
Define fundamental frequency.
The fundamental frequency is the lowest frequency component in the Fourier representation of a periodic quantity.
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.
What is attenuation?
Attenuation is the gradual weakening of a signal over distance.
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.
What key factors affect channel capacity?
Bandwidth, noise, and error rate.
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