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Zorluk: ZorTroubleshooting Physical Cabling and Connectors

A network technician is troubleshooting an intermittent 10GBASE-LR single-mode fiber optic backbone link between two core switches. Interface telemetry reveals elevated bit error rates (BER) and an optical receiver power level well below the specified threshold. Which TWO of the following diagnostic steps or tools should the technician use to isolate the physical layer defect?

  1. Measure the optical power loss across the link using an optical power meter calibrated to the 1310 nm operating wavelength.Cevap
  2. Inspect the fiber connector ferrule end-faces using a specialized fiber inspection probe to check for dust or surface scratches.Cevap
  3. C
    Connect a copper Time Domain Reflectometer (TDR) to locate split pair conditions along the cabling run.
  4. D
    Use a tone generator and probe kit to trace the conductors and verify T568B pinout color coding.

Cevap

The technician should measure optical loss using an optical power meter calibrated to 1310 nm and inspect the fiber end-faces with a fiber inspection scope.
Measuring optical attenuation with an optical power meter set to 1310 nm directly quantifies signal loss on single-mode fiber links, while using a fiber inspection scope inspects connector end-faces for microscopic contamination or scratches that cause high insertion loss.

Adım Adım Çözüm

1
Identify the media type and reported symptoms.
The link uses 10GBASE-LR single-mode fiber operating at 1310 nm, experiencing low optical power and high BER.
Choosing the appropriate physical troubleshooting tools requires matching tools to optical fiber media characteristics rather than copper twisted-pair.
2
Evaluate optical signal testing methods.
An optical power meter (OPM) calibrated for 1310 nm verifies actual light levels arriving at the receiver.
OPMs measure absolute optical power and signal attenuation against baseline standards.
3
Evaluate physical connector inspection requirements.
A fiber inspection scope allows visual verification of the polished ferrule surface.
Microscopic dust, oils, or scratches on fiber end-faces attenuate light signals and introduce optical return loss.

Anahtar Kavram

Fiber Optic Physical Layer Diagnostics and Tool Selection
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Konular

Troubleshooting Physical Cabling and Connectors

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