Certifying Twisted Pair Cabling
Monitoring Impulse Noise 3
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Monitoring Impulse Noise
Impulse noise is electrical noise generated by fluorescent
lights, electric motors, electric heaters and air
conditioners, photocopiers, refrigerators, microwave
ovens, and other electric devices. Active links in the same
pathway can also cause noise.
Noise distorts the shape of digital signals, as shown in
Figure 3-22. Too much noise can cause transmission
errors, resulting in poor network performance.
The impulse noise test lets you monitor noise on inactive
twisted pair cabling to determine if the noise may affect
network operation.
Received
signals
distorted
by noise
Signal
source
LAN cabling
amd95f.eps
Figure 3-22. Causes and Effects of Noise
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