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Ge ne ra l Consid e ra tions  

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.  

Te m p e ra ture  

The attenuation of PVC-insulated cable varies significantly with  

temperature. Check the cable manufacturer’s specifications. Plenum-  

rated cables are strongly recommended in areas where temperatures  

exceed 40˚C. Under such conditions, plenum-rated cables ensure that  

cable attenuation remains within specifications.  

Insta lla tion Re c om m e nd a tions  

In addition to complying with the cable specifications presented in  

Sections 2.2 and 2.3, 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.  

No more than two punch-down blocks should exist between TCU  

ports and wall outlets.  

•

•

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.  

UTP cables that contain Token Ring signals should not be  

simultaneously used for applications which may impress high  

voltages (greater than 5 volts) with sharp rise or fall times, since the  

noise coupling from such signals could directly cause errors on the  

Token Ring network.  

•

For single telecommunications closet rings, lobe lengths should not  

exceed 100 meters of 22 to 24 AWG wire from the attaching device and  

the TCU port.  

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