Communication solutions for power utilities
UNIVERSAL TELEPROTECTION TPU-1
INSTALLATION AND COMMISSIONING MANUAL Web version TPU-1R - Rev. 5.9 (May 2018)
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The UTP-5 cable is made up of eight copper wires that form the four twisted pairs, covered
in different coloured insulating material. Figure 29 shows the colour of the wires that make
up each one of the pairs, according to ANSI/TIA/EIA-568-A standard.
Figure 29 Unshielded twisted pair category five cable (UTP-5) with RJ-45 connector
according to ANSI/TIA/EIA-568-A standard
If the TPU-1 terminal is connected directly to the computer, a crossover cable must be used,
see Figure 30, where pairs 2 and 3 at one end of the cable are reversed at the other.
However, should the computer and the TPU-1 terminal are connected to a hub or a switch
(connection via IP network), straight-through cables must be used, see Figure 31, where the
4 pairs correspond at both ends of the cable.
