Which device is used to identify faults along copper cables by sending a pulse and observing reflections?

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This item tests using a pulse-and-reflection method to locate faults in copper cables. Time-Domain Reflectometry sends a fast electrical pulse along the cable and watches for reflections caused by impedance changes, such as opens, shorts, or damaged connectors. When the pulse hits a fault, part of it is reflected back. By measuring the time it takes for the reflection to return and knowing the signal’s propagation speed, you can calculate how far along the line the fault is. The strength and shape of the reflection also help identify the type of fault.

A cable tester checks basic continuity and correct mapping of pairs but doesn’t locate faults along a long run via reflections. A toner and probe helps trace a cable’s route but doesn’t reveal fault locations. A multimeter measures voltage, resistance, or current, but not locate faults along a line using reflection analysis.