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General Networking Considerations
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Crosstalk 2
Crosstalk is interference caused by signal coupling between different cable
pairs contained within a multi-pair cable bundle. Multi-pair cables should
not be used for UTP lobe cabling. Avoid mixing Token Ring signals with
other applications (voice, etc.) within the same cable.
Noise 3
Noise can be caused by either crosstalk or externally induced impulses.
Outside systems (motors, switching equipment, fluorescent lighting, high
amperage equipment) may produce electrical interference causing noise.
The number and quality of cable connections also contribute considerably
to noise levels. To reduce noise induced errors, it may be necessary to
re-route cabling away from potential noise sources, or to ensure that the
electrical wiring in the area is properly wired and grounded, or to replace
connectors along affected segments.
Temperature
4
Signal attenuation varies significantly with temperature when
PVC-insulated cable is used. In areas where temperatures exceed 40˚C, it
is strongly recommended that plenum-rated cables be used instead to
ensure that signal attenuation remains within specifications.
Installation Recommendations 5
In addition to complying with the cable specifications presented in
Appendix A, TPIM Specifications, the cabling installation should comply
with the following recommendations to obtain optimum performance
from the network:
• UTP cabling should be free of splices, stubs, or bridged taps.
• Metal troughs, ducts, etc. carrying Token Ring signals should be
properly grounded.
• Cables should be routed away from sources of electrical noise, such as
power lines, fluorescent lights, electric motors, radio interference, and
heavy machinery.
• Token Ring signals should not be routed through UTP cables that exit
a building or which are adjacent to cables either exiting a building or
exposed to lightning strikes and power surges.