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Question

Difficulty: EasyTroubleshooting Physical Cabling and Connectors

A network administrator needs to determine the exact distance along a 90-meter copper Ethernet cable run to locate an open circuit break hidden inside a wall. Which tool should the administrator use to measure the distance to the fault?

  1. Time-Domain Reflectometer (TDR)Answer
  2. B
    Tone generator and probe
  3. C
    Optical power meter
  4. D
    Continuity wire mapper

Answer

Time-Domain Reflectometer (TDR)
A Time-Domain Reflectometer (TDR) sends high-frequency electrical pulses down copper cable pairs. When a pulse encounters an open break or short, energy reflects back to the source. By measuring the elapsed time of the reflection, the TDR calculates the precise distance to the cable defect.

Step-by-Step Solution

1
Identify the symptom and requirements
The scenario requires measuring the exact physical distance along a copper cable to locate a wire break.
Determining distance to a fault avoids tearing down wall sections unnecessarily.
2
Select the proper diagnostic tool for copper distance measuring
A Time-Domain Reflectometer (TDR) transmits electrical pulses down copper conductors and analyzes signal reflections.
The timing of signal reflections allows the device to compute the precise length to impedance changes or breaks.

Key Concept

Using a Time-Domain Reflectometer (TDR) to locate distance to copper cabling faults.
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Topics

Troubleshooting Physical Cabling and Connectors

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