Versiv Series Cabling Certification Product Family
Technical Reference Handbook
120
Impedance
Notes
Most test limits do not require the impedance
measurement. For these limits, the tester does not
make the measurement or it shows an for the
result
For cables shorter than approximately 13 ft (4 m),
the tester shows Cable too short for the impedance
measurement.
Impedance results show the approximate characteristic
impedance of each wire pair. Figure 50 shows the impedance
results.
Characteristic impedance is the impedance a cable would have if
the cable were infinitely long. Correct operation of the network
depends on constant characteristic impedance throughout the
system’s cables and connectors. Sudden changes in characteristic
impedance, called anomalies, cause signal reflections that can
cause network faults.
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