Practice Test Geeks(VDV) Voice Data Video Technician Certified Practice Test
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Cabling Infrastructure Flashcards

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

Read the first 7 Cabling Infrastructure flashcards as text

  1. What is the minimum separation distance required between unshielded communications cables and open fluorescent lighting fixtures per TIA-569?

    Answer: 150 mm (6 inches)

    TIA-569 requires at least 150 mm (6 inches) of separation between unshielded communications cables and open (unshielded) fluorescent light fixtures to reduce electromagnetic interference.

  2. A VDV technician is asked to install cabling in a riser between floors. Which cable jacket rating is required?

    Answer: CMR

    CMR (Communications Riser) rated cable is required for vertical runs between floors because it is designed to resist flame spread in vertical shafts without the full plenum rating.

  3. Which fiber optic test instrument measures the end-to-end insertion loss of a fiber link using a known light source?

    Answer: Optical Power Meter with Light Source (OLTS)

    An OLTS (Optical Loss Test Set) consisting of a calibrated light source and power meter measures total insertion loss through the entire fiber link, which is the required acceptance test per TIA-568.

  4. When pulling fiber optic cable through conduit, which method best protects the cable from damage?

    Answer: Using a Kellems mesh grip sized to the cable OD

    A Kellems (woven wire mesh) pulling grip distributes tension evenly along the cable jacket rather than concentrating stress at a single point, preventing damage to the fiber strands inside.

  5. What is the purpose of a telecommunications bonding backbone (TBB) conductor being sized larger as it gets longer per TIA-607?

    Answer: To compensate for increased resistance over longer lengths and maintain bonding effectiveness

    TIA-607 requires the TBB conductor to increase in cross-sectional area as its length increases so that DC resistance remains low, ensuring effective equalization of ground potential throughout the building.

  6. A coaxial cable measures 75 ohms impedance. For which application is this impedance standard most commonly specified?

    Answer: RF and video signal distribution

    75-ohm coaxial cable (e.g., RG-6, RG-59) is the industry standard for CATV, satellite, and video distribution systems, while 50-ohm coax is used for data and RF transmission equipment.

  7. Which of the following is a key advantage of using pre-terminated fiber trunk cables in a data center installation?

    Answer: They reduce installation time and minimize splice loss by factory-polishing connectors

    Factory pre-terminated trunks arrive with precisely polished connectors and factory-tested performance, significantly reducing on-site labor and providing consistent, low-loss terminations compared to field work.