96
SCAN-LAN VI
The table below discusses some of the common sources of noise and their
solutions.
Common Causes of
Noise
Solution
Electric motors
Re-route the cable or follow your installation specification.
If in an extremely noisy environment, it may be necessary to
choose an alternate medium instead of UTP (for example,
coax, fiber, etc.).
Light fixtures
Same as for electric motors.
Power lines
Same as for electric motors.
RF interference
Same as for electric motors.
Data lines are shared Keep data lines separate from voice lines. Re-route voice lines
with voice lines
to a different cable.
The table below discusses some common noise problems and their
solutions.
Test Results
Possible Solutions
Fails noise (10BASE-T) The cause of the noise is closer to one end than the other.
from one end, but not
the other, or noise is
Perform a LENGTH test from the end that detects the noise
much greater
to determine if there is an anomaly present.
measured from one
end than from the other Follow the segment from the end where noise was detected
and look for “
Common Causes of Noise
.”
8.2.6 I
MPEDANCE
The SCAN-LAN VI does not have impedance.
8.2.7 R
ESISTANCE
Resistance is defined as an electrical element that impedes the flow of DC
current. It is measured in ohms. As a test, it is used to confirm there are no
poor connections that add to the resistance of the segment. Many times, if
the resistance is not within the specification, the problem may also show up
as excessive attenuation or as an impedance anomaly.
Summary of Contents for SCAN-LAN VI
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