User manual Cabletron Systems 24

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UTP Lob e Le ng ths  
UTP ca blin g to a n y n on -Token Rin g n etwor k con d u ctor s  
(telephone, etc.) or gr ou n d . If in doubt, test wiring before using.  
.3.2 UTP Lob e Le ng ths  
The physical length of the cable connecting a station to a TCU port on the  
concentrator is referred to as the lobe length. The maximum lobe length  
attainable with the concentrator, under ideal conditions, is shown in Table  
-2. Cable routing, connector attenuation, noise, and crosstalk can  
adversely affect the maximum lobe length.  
Table 2-2. UTP Maximum Lobe Lengths.  
4 Mb/s  
@ 16 Mb/s  
for cable with NEXT loss 30.5 dB per 100m  
Some UTP category 3 cables fail to meet the performance minimums  
required to support a Token Ring network. Whereas category 3 allows for  
near end crosstalk (NEXT) loss as low as 23 dB per 100 m at 16 Mb/s,  
Token Ring performance requirements demand a NEXT loss of at least  
0.5 dB. To safeguard against worst case conditions (running at 16 Mb/s  
and using category 3 cable with the category’s lowest qualifying NEXT  
loss—23 dB), the recommended maximum lobe length should be reduced  
to keep crosstalk interference within acceptable levels when using  
category 3 cable.  
.4 STP Ca b ling Sp e c ific a tions  
Both STP concentrator modules (STH-42 / 44) support all STP cables  
classified as IBM Types 1, 2, 6, and 9. All cables meeting the criteria for  
classification as IBM Type 1, 2, 6, or 9 meet Token Ring network  
performance requirements.  
Page 2-5  

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