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Difficulty: MediumTroubleshooting Physical Cabling and Connectors

Following an office wall installation project, a workstation loses network access. A network technician suspects that a 120-meter Category 6 unshielded twisted-pair (UTP) cable running through the wall cavity has been physically severed by a drywall fastener. Which diagnostic tool should the technician use to determine the exact distance along the cable run to the location of the break?

  1. Time-Domain Reflectometer (TDR)Answer
  2. B
    Tone generator and probe kit
  3. C
    Optical Power Meter (OPM)
  4. D
    Basic wire mapper

Answer

Time-Domain Reflectometer (TDR)
A Time-Domain Reflectometer (TDR) functions by emitting high-frequency electrical pulses down copper cable conductors. When the pulse strikes an impedance anomaly—such as an open circuit caused by a severed wire—a portion of the signal reflects back to the instrument. By measuring the round-trip time of the reflection, the TDR accurately determines the distance to the fault.

Step-by-Step Solution

1
Analyze the physical failure scenario and requirement
The scenario identifies a physical break (open fault) inside a copper UTP cable run behind walls where the distance to the break must be accurately pinpointed.
Measuring distance to the break allows technicians to access and repair damaged cabling with minimal structural disruption.
2
Evaluate copper testing tool capabilities for fault location
A Time-Domain Reflectometer (TDR) sends electrical pulses down the copper wire and measures the return reflection caused by the open circuit to calculate exact distance.
TDR technology utilizes signal reflection and Nominal Velocity of Propagation (NVP) to measure distance to impedance changes.

Key Concept

Selecting Physical Cabling Diagnostic Tools
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Topics

Troubleshooting Physical Cabling and Connectors

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