OMNIScanner User Guide
6 - 10
Impulse Noise
Noise is undesirable electrical energy that falls within the typical network
frequency bands of operation (generally 1-20 Mhz). It interferes with a
network’s ability to transmit data reliably. Noise sources may include AC
transmission lines, fluorescent light fixtures, industrial equipment, eleva-
tors, etc. Noise problems also occur when other wire pairs in the same
sheath are used for non-LAN applications.
Testing for noise involves turning off all LAN devices and measuring for
background electrical activity in the cabling. Often, noise problems can be
corrected by moving the cable away from the source or by removing the
source itself.
Impulse Noise counts the impulses detected on a given pair
Select Impulse Noise to open the IMPULSE NOISE
screen. The current date and time is shown in the
upper left. The monitored pair is shown in the upper
right.
Impulses/sec indicates the number of wide band
impulses that exceed 30 mv peak-to-peak that were
detected in the last 1second interval.
Total Impulses indicates the total number of impulses detected since noise
monitoring was started.
Elapsed Time indicates the time since the test was started.
Press (Pair) to clear the current log and monitor impulse noise on
another pair.
Press (Detail) to open the LOG screen.
OMNIScanner keeps a log during impulse noise
monitoring. The log represents the seven largest
impulse noise counts detected and the date and
times at which they occurred.
Press ESC to exit the LOG screen.
Press ESC to exit the IMPULSE NOISE screen.
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