Fluke Networks CertiFiber Pro Users Manual - Manual (Page 133)

Chapter 3: How to Certify Twisted Pair Cabling
Twisted Pair Autotest Results
111
GPU93.EPS
Figure 55. Common-Mode Voltage Converts to
Differential-Mode Voltage in an RJ45 Connector
GPU91.PNG
Figure 56. CDNEXT Plot
8
7
6
5
4
3
2
1
Pair
4
Pair
3
Pair
2
Pair
1
The common-mode voltage on wire 8
induces voltage on wire 6, but not wire 3,
so pair 3 develops a differential voltage.