DTX Series CableAnalyzer
Technical Reference Handbook
3-16
Characteristic Impedance
Note
Most test limits do not require the characteristic
impedance measurement. Characteristic impedance
is not displayed for these limits.
Impedance measurements require a cable at least
13 ft (4 m) long. The tester shows Unknown for
cables shorter than this.
Characteristic impedance results show approximate
characteristic impedance of each cable pair.
Characteristic impedance is the impedance a cable would
have if the cable were infinitely long. Proper network
operation depends on constant characteristic impedance
throughout the system’s cables and connectors. Abrupt
changes in characteristic impedance, called anomalies,
cause signal reflections that can cause network faults.
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