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ENC3250 Solutions pg 5

ENC3250 Solutions pg 5 - CHAPTER 2 TRANSMISSION...

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-5- A A NSWERS TO NSWERS TO Q Q UESTIONS UESTIONS 2.1 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. 2.2 Amplitude, frequency, and phase are three important characteristics of a periodic signal. 2.3 2 π radians. 2.4 The relationship is λ f = v , where λ is the wavelength, f is the frequency, and v is the speed at which the signal is traveling. 2.5 The spectrum of a signal consists of the frequencies it contains; the bandwidth of a signal is the width of the spectrum. 2.6 Attenuation is the gradual weakening of a signal over distance. 2.7 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.
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