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Question

Difficulty: EasyTroubleshooting Physical Cabling and Connectors

A network technician is investigating a total signal loss along a long optical fiber cable run connecting two data center racks. Which diagnostic tool should the technician use to measure the exact distance to the location of the physical fiber break?

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

Answer

Optical Time-Domain Reflectometer (OTDR)
An Optical Time-Domain Reflectometer (OTDR) sends light pulses down an optical fiber and analyzes the backscattered light. By measuring the elapsed time of reflections, it accurately calculates the precise distance to splices, bends, or physical breaks along the cable.

Step-by-Step Solution

1
Identify the diagnostic requirement
The requirement is to locate the exact physical distance to a break in a fiber optic cable run.
The scenario specifically requests measuring the distance to a fault in optical fiber.
2
Select the appropriate physical layer fiber diagnostic tool
An Optical Time-Domain Reflectometer (OTDR) measures reflected light pulses over time to calculate the distance to optical cable splices and breaks.
OTDR is the standard instrument used for distance-to-fault measurements on fiber cabling.

Key Concept

Using an OTDR to measure distance to optical fiber cabling faults
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Topics

Troubleshooting Physical Cabling and Connectors

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