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Difficulty: MediumTroubleshooting Physical Cabling and Connectors

A network technician is investigating performance issues on several newly installed cabling runs connecting a distribution switch to server racks. The technician needs to identify appropriate diagnostic procedures and remedies for physical layer faults. Which of the following actions and tool selections correctly resolve these physical layer problems? (Select TWO.)

  1. Use an Optical Power Meter (OPM) to measure signal power loss across a fiber optic patch link suspect of excessive attenuation.Answer
  2. Reterminate an RJ-45 connector on a Category 6 UTP cable using consistent T568B pinouts on both ends to resolve a split pair condition.Answer
  3. C
    Use a tone generator and inductive probe kit to pinpoint the exact distance to a severed conductor inside a copper conduit.
  4. D
    Use a basic continuity wiremapper to calculate Near-End Crosstalk (NEXT) and attenuation on high-speed copper cabling drops.

Answer

The correct responses are using an Optical Power Meter (OPM) to measure light attenuation across a fiber link, and reterminating Category 6 UTP cable connectors with consistent T568B pinouts to correct split pairs.
Measuring fiber power loss requires an Optical Power Meter (OPM) to test light intensity, while resolving split pairs on twisted-pair cables requires reterminating connectors consistently to a standard such as T568B so that signals travel along paired twists.

Step-by-Step Solution

1
Evaluate fiber optic diagnostic requirement
Identify that light loss / attenuation along a fiber link is directly measured in dB or dBm using an Optical Power Meter combined with a light source.
OPM is the standard instrument for validating fiber optic power levels and decibel loss.
2
Identify corrective action for split pairs on copper twisted-pair cabling
Recognize that split pairs result from incorrect pin assignment configurations across twisted pairs and require proper retermination according to TIA/EIA-568 standards.
Reterminating both ends to standard T568B ensures corresponding signals travel along correctly twisted pairs, minimizing NEXT.
3
Analyze incorrect tool selection choices
Distinguish between wire tracing tools (tone probe), basic continuity testers (wiremapper), and distance/performance diagnostics (TDR / Cable Certifier).
Tone probes trace cables and wiremappers check simple continuity, but neither locate fault distances or measure high-frequency noise.

Key Concept

Selecting accurate testing equipment (OPM vs TDR vs tone probe) and applying standard cable termination (T568A/B) to resolve copper and fiber physical layer faults.
Estimated Time:1m 30s
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Troubleshooting Physical Cabling and Connectors

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