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UTP Cabling Specifications
Table 2-2. UTP Cable Category Specifications
UTP
Operating
Cat.
Frequency
3
4 MHz
16 MHz
4
4 MHz
16 MHz
5
4 MHz
16 MHz
*below Token Ring performance requirement of
Category 3 usually consists of four Unshielded Twisted Pairs of 24 AWG
solid wire for data or voice communication. (IBM Type 3 is coincidentally
the same as UTP Category 3.) It is typically used to wire cable runs within
the walls of buildings. In some installations, pre-existing UTP building
wiring can be used for Token Ring cabling.
At 16 Mbps ring speeds, some Category 3 cable does not meet the
performance requirements of a Token Ring network. This may
WARNING
impose lower limits on lobe cable distances and ring node counts.
See Table 2-2.
Categories 4 and 5 are higher quality versions of Category 3. They use the
same gauge of wire but demonstrate superior performance due to
improvements in material quality and assembly (e.g. more twists per foot).
Because Near-End Crosstalk (NEXT) contributes the majority of its
detrimental effects near the end of a lobe cable, the quality of jumper
WARNING
cables and patch cables is most critical. Seek the highest practical
grade. The quality of connectors and terminators is also critical.
Telephone battery and ringing voltages used in UTP telephone
circuits could present a shock hazard and can damage Token Ring
WARNING
equipment if connected to Token Ring cabling. DO NOT connect
UTP cabling to any non-Token Ring network conductors
(telephone, etc.) or ground. If in doubt, test wiring before using.
Page 2-4
Electrical
Impedance
100
15%
100
15%
100
15%
100
15%
100
15%
100
15%
Signal
Attenuation
per 100m
5.6 dB
13.1 dB
4.3 dB
8.9 dB
4.3 dB
8.2 dB
30.5 dB.
NEXT
loss
(@ 100m)
32 dB
23 dB*
47 dB
38 dB
63 dB
44 dB
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