Noise can degrade or distort a signal on a network; what are some of its causes?
What will be an ideal response?
ANSWER: Two common sources of noise are:
* EMI (electromagnetic interference)-Caused by motors, power lines, televisions, copiers, fluorescent lights, microwave ovens, manufacturing machinery, and other sources of electrical activity (including a severe thunderstorm). One type of EMI is RFI (radio frequency interference), or electromagnetic interference caused by radio waves. (Often, you'll see EMI referred to as EMI/RFI.) Strong broadcast signals from radio or TV antennas can generate RFI.
* crosstalk-Occurs when a signal traveling on one wire or cable infringes on the signal traveling over an adjacent wire or cable. The resulting noise, or crosstalk, is equal to a portion of the second line's signal. If you've ever been on a traditional, landline phone and heard the conversation on a second line in the background, you have heard the effects of crosstalk.
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