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Difficulty: HardNetwork Cable Types and Connectors

A network engineer is designing cabling infrastructure for a manufacturing facility expansion. The project requires two specific cabling runs: Run 1 is a 75-meter horizontal drop routed through an environmental air plenum space adjacent to high-voltage industrial motors generating severe electromagnetic interference (EMI). Run 2 is a 400-meter inter-building backbone connection between two separate facilities with differing electrical ground potentials.

Which of the following cabling specifications and standards should the engineer select to meet all distance, fire safety, noise immunity, and grounding requirements? (Select TWO.)

  1. CMP-rated (Plenum) Shielded Twisted Pair (STP) Category 6a cabling for Run 1Answer
  2. Single-Mode Fiber (SMF) optical cabling with LC connectors for Run 2Answer
  3. C
    CMR-rated (Riser) Unshielded Twisted Pair (UTP) Category 6 cabling for Run 1
  4. D
    RG-6 coaxial cable terminated with F-type connectors for Run 2

Answer

The network engineer should deploy CMP-rated Shielded Twisted Pair (STP) Category 6a cabling for the horizontal plenum run (Run 1) and Single-Mode Fiber (SMF) optical cabling for the inter-building backbone connection (Run 2).
Deploying CMP-rated Shielded Twisted Pair (STP) Category 6a satisfies the 75-meter length requirement while adhering to strict plenum fire code regulations and insulating data signals against motor-induced EMI. Deploying Single-Mode Fiber (SMF) for the 400-meter inter-building backbone overcomes the 100-meter copper distance limitation and eliminates risk from electrical ground potential differences.

Step-by-Step Solution

1
Analyze the requirements for Run 1 (75m, environmental air plenum space, high EMI).
Identify that plenum spaces require CMP-rated jackets to meet building fire codes, high EMI requires Shielded Twisted Pair (STP) or fiber, and a 75m distance is supported by copper twisted-pair cables up to 100m.
Plenum spaces exchange air for HVAC; non-CMP cables release toxic fumes during fires. Industrial machinery produces severe EMI that degrades signals on unshielded cabling.
2
Analyze the requirements for Run 2 (400m inter-building backbone, distinct electrical grounds).
Select Single-Mode Fiber (SMF) optic cable.
Copper twisted-pair cable maxes out at 100m. Inter-building runs over 100m require fiber optic cable. Single-mode fiber supports long distances and uses light instead of electricity, avoiding electrical ground loops.

Key Concept

Selecting network cable types, plenum ratings, EMI shielding, and fiber optic standards based on environmental and physical limits.
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Topics

Network Cable Types and Connectors

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