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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.  

2

.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

-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  

UTP  

Category  

meters  

(feet)  

meters  

(feet)  

3

4

5

200  

225  

250  

(656)  

(738)  

(820)  

100*  

110  

120  

(328)*  

(360)  

(393)  

*

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  

3

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.  

2

.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.  

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