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Question

Difficulty: EasyTroubleshooting Physical Cabling and Connectors

A network administrator suspects that a twisted-pair copper cable run inside a wall cavity has a broken conductor, causing a complete link failure. Which of the following tools should the administrator use to locate the exact distance to the break along the cable run?

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

Answer

Time-Domain Reflectometer (TDR)
A Time-Domain Reflectometer (TDR) issues electrical signals along copper wire pairs and calculates the precise distance to an open or short circuit based on signal reflections.

Step-by-Step Solution

1
Identify the primary diagnostic requirement in the scenario.
The goal is to measure the distance along a copper cable to locate a conductor break (open circuit).
Different testing tools serve distinct functions; finding the distance to a fault requires signal reflection measurements.
2
Evaluate the capabilities of metallic cable testing tools.
A Time-Domain Reflectometer (TDR) sends pulses down the cable and analyzes reflected signals to measure distance to cable anomalies.
Impedance changes from breaks or shorts reflect pulses back to the device, enabling accurate distance calculation.

Key Concept

Using a Time-Domain Reflectometer (TDR) to locate distance to faults in copper cabling
Estimated Time:45s
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Topics

Troubleshooting Physical Cabling and Connectors

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