Utp Lobe Lengths - Cabletron Systems STHI User Manual

Unshielded Twisted Pair (UTP)
Table B-1. 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
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
WARNING
cable, the quality of jumper cables and patch cables is
critical. Seek the highest practical grade. The quality of
connectors and terminators is also critical.
DO NOT connect UTP cabling to any non-Token Ring
network conductors (telephone, etc.) or ground. If in doubt,
WARNING
test wiring before using. Telephone Battery and Ringing
voltages used in UTP telephone circuits may present a shock
hazard and may damage Token Ring equipment when
connected to Token Ring cabling.
B.1.2

UTP Lobe Lengths

The physical length of the cable connecting a station to a TCU port on the
STHI is referred to as the lobe length. The maximum lobe length
attainable under ideal conditions, is shown in Table B-2. Cable routing,
connector attenuation, noise, and crosstalk can adversely affect the
maximum lobe length.
Page B-2
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