Cabletron Systems TRXI-24 - Manual (Page 20)

REQUIREMENTS/SPECIFICATIONS
Page 2-9
2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING
The following sections describe common cable problems and
recommendations for correcting them.
Crosstalk
Crosstalk is interference caused by signal coupling between the
different cable pairs contained within a multi-pair cable bundle.
Multi-pair cables should not be used for UTP lobe cabling. UTP lobe
cabling should be dedicated to carrying token ring traffic. Avoid
mixing token ring signals with other applications (voice, etc.) within
the same cable.
Noise
Noise can be caused by either crosstalk or externally induced
impulses. If noise induced errors are suspected, it may be necessary to
reroute cabling away from potential noise sources (motors, switching
equipment, fluorescent lighting, high amperage equipment), or to
ensure that the electrical wiring in the area is properly wired and
grounded.
Temperature
The attenuation of PVC insulated cable varies significantly with
temperature. Plenum-rated cables are strongly recommended at
temperatures greater than 40˚C to ensure that cable attenuation
remains within specification. Check the cable manufacturer’s
specifications.
In addition to complying with the preceding cable specifications, the
following recommendations should be followed to minimize errors and
help to obtain optimum performance from your network:
• UTP cabling should be free of splices, stubs or bridged taps.
• No more than two punch-down blocks between TCU ports and
wall outlets.
• Metal troughs, ducts, etc. carrying token ring signals should be
properly grounded.