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Difficulty: MediumTroubleshooting Physical Cabling and Connectors

A datacenter technician is troubleshooting a newly installed single-mode fiber optic link between two core switches that fails to establish a link status. A visual fault locator (VFL) confirms light continuity from end to end, but the switch transceivers report an absolute lack of signal. Which diagnostic instrument should the technician use to measure the exact optical loss in decibels (dB) and verify if the signal strength meets the transceiver operating specifications?

  1. An optical power meter paired with a calibrated optical light sourceAnswer
  2. B
    A metallic time-domain reflectometer (TDR)
  3. C
    A tone generator and inductive amplifier probe kit
  4. D
    A continuity wire mapper with a remote loopback adapter

Answer

An optical power meter paired with a calibrated optical light source
An optical power meter paired with an optical light source is designed specifically to test fiber optic runs by sending a light signal of known wavelength and power from one end and measuring the signal strength at the receiving end. This calculates total decibel (dB) loss to verify if the link complies with transceiver specifications.

Step-by-Step Solution

1
Identify the media type and symptom requirements
The link utilizes single-mode optical fiber cabling, and the task requires quantifying optical loss (attenuation in dB) against transceiver power tolerances.
While a visual fault locator verifies continuity by projecting visible light, it cannot measure optical power levels or decibel loss.
2
Evaluate diagnostic instruments for fiber optic signal strength measurement
An optical power meter (OPM) combined with a calibrated optical light source measures signal attenuation by comparing emitted power with received power across the cable run.
Instruments intended for copper media rely on electrical signals and cannot interface with optical strands.
3
Select the correct testing equipment
The optical power meter paired with a calibrated light source is the accurate diagnostic tool for determining decibel loss.
This tool directly measures dB loss to confirm whether insertion loss exceeds the optical budget.

Key Concept

Selecting proper fiber optic testing tools to measure decibel attenuation and optical power levels.
Estimated Time:1m 0s
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Topics

Troubleshooting Physical Cabling and Connectors

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