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RCDD · Question #189
RCDD Question #189: Real Exam Question with Answer & Explanation
The correct answer is B. Directional coupler. In a trunk-and-tap CATV distribution system, the device that introduces the least signal loss to the through (trunk) signal at each telecommunications room is a directional coupler.
Question
A building has six floors plus a basement. Each floor is 929 sq m (10,000 sq ft) 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. In order to maintain the LEAST signal loss passing through each telecommunications room (TR) to the next telecommunications room (TR), what device should you specify for use within each telecommunications room (TR)?
Options
- ASplitter
- BDirectional coupler
- CMultiport tap
- DCombiner
Explanation
In a trunk-and-tap CATV distribution system, the device that introduces the least signal loss to the through (trunk) signal at each telecommunications room is a directional coupler.
Common mistakes.
- A. A splitter divides the input signal equally among all output ports, imposing a 3.5 dB or greater loss on every port including the through path, causing cumulative loss that is unacceptable across six floors.
- C. A multiport tap is designed to branch signal to multiple outlets on a single floor and imposes higher through-loss than a directional coupler, making it unsuitable for maintaining trunk signal strength between TRs.
- D. A combiner is used to merge multiple input signals onto one output; it does not pass a trunk signal forward and cannot serve a distribution function in this context.
Concept tested. CATV directional coupler vs. splitter trunk signal loss
Reference. https://www.scte.org/documents/pdf/Standards/ANSI_SCTE%2060%202017.pdf
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