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Difficulty: MediumUtilizing Hardware Testers and Packet Analyzers

A network technician is troubleshooting an IP security camera that fails to power on when connected to an RJ-45 wall jack configured for Power over Ethernet (PoE). The technician needs to measure the precise electrical DC voltage output across the specific copper pins at the wall jack to confirm whether the switch port is supplying power. Which hardware tool should the technician use to perform this measurement?

  1. Digital multimeterAnswer
  2. B
    Time-Domain Reflectometer (TDR)
  3. C
    Tone generator and probe
  4. D
    Wiremap tester

Answer

A digital multimeter is the correct tool to measure electrical DC voltage across copper cable pins.
A digital multimeter measures electrical potential (DC voltage), current, and resistance. Placing the multimeter test leads across the active PoE conductor pins allows the technician to confirm whether adequate DC power is reaching the wall jack.

Step-by-Step Solution

1
Identify the primary diagnostic requirement specified in the scenario.
The requirement is to measure electrical DC voltage across specific cable pins providing Power over Ethernet (PoE).
Verifying voltage levels isolates power delivery failures from end-device hardware defects.
2
Evaluate the capabilities of standard hardware diagnostic tools.
A digital multimeter directly measures electrical voltage (volts), current (amperes), and resistance (ohms).
Cable testing tools such as TDRs, wiremappers, and tone probes test physical continuity, pin alignment, or cable tracing, but lack electrical voltage measurement functions.

Key Concept

Selecting appropriate hardware testing tools for physical layer electrical measurements
Estimated Time:1m 0s
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Topics

Utilizing Hardware Testers and Packet Analyzers

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