Practice Test Geeks(DCI) Data Cabling Installer Practice Test
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Fiber Optic Installation 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 Fiber Optic Installation flashcards as text

  1. What is 'modal dispersion' and which fiber type is most affected by it?

    Answer: Pulse spreading from multiple light paths, primarily affecting multimode fiber

    Modal dispersion occurs in multimode fiber because different modes travel different path lengths, causing pulse spreading that limits bandwidth and distance.

  2. Which TIA standard specifies the color coding of optical fibers within a cable sheath?

    Answer: ANSI/TIA-598-D

    ANSI/TIA-598-D defines the color-coding scheme for optical fiber cables, ensuring consistent fiber identification across installations.

  3. A technician measures -18 dBm at the far end of a link with a launch power of -3 dBm. What is the total link loss?

    Answer: 15 dB

    Link loss = launch power − received power = -3 dBm − (-18 dBm) = 15 dB.

  4. What is the function of a fiber optic patch panel (also called a fiber distribution unit)?

    Answer: To provide a centralized termination and cross-connect point for fiber links

    A fiber patch panel provides organized termination points allowing technicians to cross-connect or interconnect fiber links with patch cords.

  5. During a fiber optic installation, what is the purpose of 'slack loops' left inside enclosures or splice trays?

    Answer: To provide extra fiber length for future re-splicing or re-termination

    Slack loops ensure enough extra fiber length is available if a splice or connector must be redone, preventing the need to replace the entire run.

  6. Which cleaning method is considered best practice for fiber optic connector end-faces before mating?

    Answer: Wet clean with IPA followed by a dry wipe, then inspect with a fiber scope

    Best practice is a wet-then-dry clean using IPA-moistened then dry lint-free wipes or a reel cleaner, followed by inspection with a 200×–400× fiber scope.

  7. What does a high 'reflection event' spike on an OTDR trace most likely indicate?

    Answer: A mechanical connector, air gap, or fiber end causing Fresnel reflection

    Fresnel reflections at air-glass interfaces (connectors, mechanical splices, or open fiber ends) produce sharp upward spikes on an OTDR trace.