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RCDD · Question #187
RCDD Question #187: Real Exam Question with Answer & Explanation
The correct answer is A. Trunk and tap. Trunk and tap is the most cost-effective horizontal distribution design when serving a high density of outlets per floor from a single trunk cable already passing through each telecommunications room.
Question
A building has six floors plus a basement. Each floor is 10,000 square feet and has approximately 50 CATV outlets respectively. There is a single hardline trunk cable installed from the basement headend passing through the telecommunications room (TR) on each floor. What is usually the MOST cost effective coaxial cable design to implement on the horizontal distribution from the telecommunications room (TR)?
Options
- ATrunk and tap
- BHome run
- CVideo over balanced twisted-pair
- DVideo over optical fiber
Explanation
Trunk and tap is the most cost-effective horizontal distribution design when serving a high density of outlets per floor from a single trunk cable already passing through each telecommunications room.
Common mistakes.
- B. A home run design would require 50 individual coaxial cables from each outlet back to the TR on every floor, dramatically increasing cable, conduit, and labor costs for a 50-outlet-per-floor installation.
- C. Video over balanced twisted-pair requires replacing the coaxial infrastructure with UTP cabling and balun adapters at each outlet, adding equipment costs and deviating from the existing coaxial trunk plant.
- D. Video over optical fiber requires fiber cable, optical transmitters, and receivers at every endpoint, making it the most expensive option and impractical for a standard horizontal CATV distribution scenario.
Concept tested. Cost-effective CATV horizontal distribution design selection
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