79
CHAPTER 8: Testing Twisted-Pair Cable
Figure 8-3. Continuity Wiring Errors.
In addition to continuity, the TIA-568 also specifies which pins are
associated with specific wire pairs in the cable. When pin-to-pin continuity
is maintained, but the proper pairs are not, the wiring error is called a Split
Pair. A Split Pair causes severe Near-End Crosstalk (NEXT).
Figure 8-4 illustrates an example of a split pair where pins 1 and 2 are split
with 3 and 6.
Refer to the
Section 8.2.2
for an explanation of NEXT.
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
Open (8)
Reversed (1 & 2)
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
Shorted (1 & 2)
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
Crossed (1,2 to 3,6)
Summary of Contents for SCAN-LAN VI
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