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Zorluk: OrtaTroubleshooting Physical Cabling and Connectors

A network technician is troubleshooting a complete link failure across a 500-meter single-mode fiber-optic run that connects two building distribution switches through an underground conduit. The technician needs to determine whether the fiber core has suffered a physical break and measure the exact distance to the fault location from the patch panel. Which diagnostic tool should the technician use?

  1. An optical time-domain reflectometer (OTDR)Cevap
  2. B
    An optical power meter (OPM) with a calibrated light source
  3. C
    A visual fault locator (VFL)
  4. D
    A tone generator and inductive amplifier probe

Cevap

An optical time-domain reflectometer (OTDR) is the correct tool to locate the distance to a fault in a long fiber-optic cable run.
An optical time-domain reflectometer (OTDR) transmits light pulses down an optical fiber and analyzes the Rayleigh backscattering and Fresnel reflections. By measuring the elapsed time of returned reflections, it accurately plots attenuation along the cable and calculates the precise distance to physical breaks, splices, or microbends.

Adım Adım Çözüm

1
Identify the key requirement in the troubleshooting scenario
The technician needs to locate the exact distance to a physical break in a long (500-meter) fiber-optic cable run.
Different optical diagnostic tools serve distinct purposes such as measuring total loss versus pinpointing specific fault distances.
2
Evaluate optical testing tool capabilities
An optical time-domain reflectometer (OTDR) sends high-frequency light pulses into the fiber and measures the time and intensity of reflected light backscatter, calculating the exact distance to high-reflection anomalies like breaks or splices.
Only reflectometry tools (TDR for copper, OTDR for fiber) can calculate distance to a fault based on signal reflection velocity.
3
Eliminate inappropriate tools for distance-to-fault determination
Optical power meters only measure overall decibel loss end-to-end; visual fault locators only work for nearby visible breaks; tone probes only work on copper wire.
Selecting the incorrect tool results in ineffective diagnostic testing and unnecessary downtime.

Anahtar Kavram

Fiber Optic Fault Location with Optical Time-Domain Reflectometry (OTDR)
Tahmini Süre:1m 0s
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Troubleshooting Physical Cabling and Connectors

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