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 field tester reports a 'split pair' fault on a Cat 6 cable. Which symptom is most characteristic of this wiring error?

    Answer: Correct continuity but excessive near-end crosstalk (NEXT)

    A split pair passes continuity tests but causes severe NEXT because the twisted pairs are not maintained, disrupting the balanced transmission.

  2. During TDR testing of a coaxial cable, a reflected pulse appears with the same polarity as the transmitted pulse. What does this indicate?

    Answer: An open circuit fault

    An open circuit reflects the pulse with the same polarity because the impedance at the fault is higher than the cable's characteristic impedance.

  3. What does the 'PS NEXT' measurement evaluate in structured cabling testing?

    Answer: The combined crosstalk effect of all other pairs acting simultaneously on one pair

    Power Sum NEXT (PS NEXT) measures the cumulative near-end crosstalk induced on one pair by the simultaneous transmission on all other pairs in the cable.

  4. A technician measures a cable length of 312 feet using a TDR but the actual measured physical length is only 295 feet. What is the most likely cause?

    Answer: The NVP value entered is too high

    If the NVP entered is too high, the tester calculates a longer electrical length than the actual physical length, resulting in an over-reported distance.

  5. Which ANSI/TIA standard defines the performance parameters and test limits for Category 6A permanent links?

    Answer: TIA-568-D.2 / TIA-568.2-D

    TIA-568.2-D (formerly TIA-568-C.2) specifies balanced twisted-pair cabling components and performance limits including Category 6A.

  6. A patch panel port consistently fails the return loss test but passes all other parameters. Which condition is the most probable cause?

    Answer: An impedance mismatch at the punch-down termination

    Poor termination technique causing an impedance discontinuity at the punch-down point is a primary cause of return loss failures.

  7. What is the maximum allowed permanent link length for Category 6 cabling per TIA-568 when supporting 10GBASE-T?

    Answer: 90 meters

    The standard permanent link maximum is 90 meters regardless of application; 10GBASE-T may restrict channel length to 55 m in some environments, but the permanent link limit remains 90 m.