Practice Test Geeks(DCI) Data Cabling Installer Practice Test
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Testing & Troubleshooting Flashcards

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

Read the first 7 Testing & Troubleshooting flashcards as text

  1. What is the TIA-568 maximum allowable permanent link length for Category 6 horizontal cabling?

    Answer: 90 meters

    TIA-568 limits the permanent link (from telecommunications outlet to patch panel) to 90 meters, with the remaining 10 meters allocated for patch cords.

  2. A technician is troubleshooting intermittent network connectivity. The cable certifies cleanly when tested cold. What should be suspected?

    Answer: Thermal expansion causing intermittent contact failure at a connection point

    Temperature changes can cause marginal terminations to expand and contract, creating intermittent contacts that pass when cool but fail under load or heat.

  3. Which tool measures optical power at the end of a fiber to determine insertion loss during an OLTS test?

    Answer: Optical power meter

    An optical power meter, used with a light source, measures the received power at the far end to calculate insertion loss during Optical Loss Test Set (OLTS) testing.

  4. A fiber link passes insertion loss but shows high reflectance. What is the most likely cause?

    Answer: Physical contact (PC) connectors that are not properly mating

    Poor physical contact between connector end faces creates an air gap that causes Fresnel reflections, increasing reflectance even if enough light passes for acceptable loss.

  5. When performing a wire map test, pins 3 and 6 are shown swapped at the remote end. Which pair is affected?

    Answer: Pair 2 (orange)

    In T568B wiring, pins 3 and 6 carry pair 2 (orange/orange-white); swapping them on the same pair would be a reversal, but if they are from different pairs it is a split pair.

  6. A technician must verify fiber polarity in an MPO trunk. Which standard describes the polarity methods A, B, and C?

    Answer: TIA-568

    TIA-568 defines MPO/MTP polarity methods A, B, and C to ensure consistent transmit-to-receive alignment across structured cabling systems.

  7. What does a 'short' fault on a wire map test indicate?

    Answer: Two or more conductors are electrically connected where they should not be

    A short (or short circuit) means two conductors that should be electrically isolated are making unwanted contact, often due to a damaged jacket or bad termination.