Cabletron Systems TRXI-44 User Manual

 

Page 2-9

 

The following sections describe common cable problems and 
recommendations for correcting them. 

 

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 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.

 

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.