Practice Test Geeks(CPCT) Certified Premises Cabling Technician Practice Test
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Cable Testing & Troubleshooting Flashcards

7 cards from real CPCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Cable Testing & Troubleshooting flashcards as text

  1. A technician is troubleshooting a Cat 6A channel where 10GBASE-T is experiencing frequent errors. All individual pair parameters pass certification. Which additional test should be performed?

    Answer: Alien crosstalk (ANEXT/AACR-F) on the channel

    10GBASE-T is highly susceptible to alien crosstalk; ANEXT and AACR-F testing evaluates interference from adjacent cables that internal pair tests do not capture.

  2. What does the term 'headroom' mean in the context of cable certification testing?

    Answer: The margin by which a measured value exceeds (or falls short of) the pass/fail limit

    Headroom is the difference between the measured performance value and the test limit, indicating how much margin exists before the parameter would fail.

  3. During fiber certification, an OTDR event table shows a reflective event followed immediately by a non-reflective event at the same location. What does this combination most likely represent?

    Answer: A connector mated to a bulkhead adapter

    A connector in a bulkhead adapter produces a reflective event (Fresnel reflection at the glass-air interface) and the loss appears as a non-reflective loss at the same location.

  4. Which test instrument would be BEST suited to identify the specific location of a coax cable fault in a CATV distribution system within a building?

    Answer: Time domain reflectometer (TDR)

    A TDR sends electrical pulses into the coaxial cable and measures reflections to locate impedance discontinuities such as opens, shorts, or damage.

  5. A Cat 5e cable link passes all parameters except for pair delay skew, which measures 60 ns. What is the TIA-568 maximum allowed pair delay skew for this category?

    Answer: 50 ns

    TIA-568 specifies a maximum pair-to-pair delay skew of 50 ns for Category 5e and Category 6 cabling.

  6. When troubleshooting an intermittent connectivity problem on a copper link, a technician suspects a failing connector. Which test method is most effective for revealing an intermittent fault?

    Answer: Dynamic stress test — flexing connectors and cables during continuous link monitoring

    Flexing the cable and connector during testing stresses the intermittent connection, causing it to open or short and be captured by the tester.

  7. A link tester displays 'FAIL — Propagation Delay' on a Category 6 run. Which condition would most commonly cause this failure?

    Answer: The cable run exceeds the maximum length, increasing travel time beyond the limit

    Propagation delay increases proportionally with cable length; a run exceeding 100 meters will typically produce a propagation delay failure.