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A decrease in amplitude as a signal propagates along a
transmission medium is known as:
A. noise.
B. crosstalk.
C. attenuation.
D. delay distortion.
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Answer: C
Attenuation is a signal degradation (decrease in amplitude)
that occurs as a signal propagates along a transmission
medium. This is seen particularly when the medium is copper
wire. Noise is also a signal degradation that refers to a
large amount of electrical fluctuation that can interfere
with the interpretation of the signal by the receiver.
Crosstalk is one example of noise where unwanted electrical
coupling between adjacent lines causes the signal in one
wire to be picked up by the signal in an adjacent wire.
Delay distortion can result in a misinterpretation of a
signal that results from transmitting a digital signal with
varying frequency components. The various components arrive
at the receiver with varying delays.
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