Chapter 7
Testing Twisted Pairs
Page 7-3
WIRE MAP
Wire map is used to test the continuity of a cable and also to check
for split pairs. Continuity is the electrical connection of a wire
from one end of the cable to the other.
Typically when testing twisted pair cable, it is desired to have all
wires connected straight-through. Straight-through means that pin
1 of the connector on one end is connected to pin 1 of the
connector on the other end, pin 2 is connected to pin 2, 3 to 3 and
so on.
Figure 7-2 illustrates correct connectivity and pairing per the TIA
568 specification.
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
Figure 7-2. TIA-568 Connectivity Requirements
Wire Map checks for shorts, opens, crossed pairs, reversed pairs
and other wiring errors. Wire Map also checks the continuity of a
shield if one exists.
When installing a new link or modifying an old link, it is very
common to accidentally create wiring errors. Figure 7-3 illustrates
common continuity wiring errors.
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