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Difficulty: MediumTroubleshooting Physical Cabling and Connectors

A network administrator is troubleshooting an unbundled Category 6 copper cable run passing through a ceiling plenum that suddenly lost connectivity. The administrator suspects the cable was damaged or cut at an unknown point along its 85-meter length. Which diagnostic instrument should be utilized to measure the exact distance to the cable fault?

  1. Time-Domain Reflectometer (TDR)Answer
  2. B
    Tone generator and probe
  3. C
    Basic continuity wire mapper
  4. D
    Loopback plug

Answer

Time-Domain Reflectometer (TDR)
A Time-Domain Reflectometer (TDR) sends an electrical pulse down a copper cable and records signal reflections caused by impedance anomalies. By measuring the time delay of the returned signal, the device calculates the precise distance to a physical break or open circuit.

Step-by-Step Solution

1
Identify the primary diagnostic requirement from the scenario.
The goal is to determine the exact distance along a copper cable run where a physical break or severance occurred.
The cable run is 85 meters long and hidden behind ceiling plenum spaces, making visual inspection inefficient.
2
Evaluate testing tools based on their operating principles.
A Time-Domain Reflectometer (TDR) sends signal pulses down copper conductors and analyzes the timing of reflected signals to calculate distance to impedance disruptions (opens or shorts).
Only a TDR (or OTDR for optical fiber) provides distance-to-fault measurements.

Key Concept

Using TDR to locate physical copper cabling faults
Estimated Time:1m 0s
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Topics

Troubleshooting Physical Cabling and Connectors

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