RCDD Question #336: Real Exam Question with Answer & Explanation

The correct answer is B. Radiating coaxial cable. Radiating coaxial cable, also called leaky feeder, acts as a bidirectional distributed antenna in a DAS by using slots in its outer conductor to simultaneously radiate and receive RF signals along its entire length.

Question

When considering the DAS, which component acts as a bidirectional antenna?

Options

AMultimode optical fiber cable
BRadiating coaxial cable
CShielded twisted pair (STP) cable
DSingle mode optical fiber cable
EScreened twisted pair (ScTP) cable

Explanation

Radiating coaxial cable, also called leaky feeder, acts as a bidirectional distributed antenna in a DAS by using slots in its outer conductor to simultaneously radiate and receive RF signals along its entire length.

Common mistakes.

A. Multimode optical fiber carries modulated light signals used for fiber-based DAS transport backhaul and has no RF radiating or receiving properties.
C. Shielded twisted pair cable is designed for structured cabling data and voice applications and cannot radiate or receive RF signals in a DAS.
D. Single mode optical fiber carries optical signals over long-distance fiber DAS transport links and does not function as an RF antenna.
E. Screened twisted pair cable is used for structured data cabling with EMI shielding and has no role as an RF antenna component in a DAS.

Concept tested. Radiating coaxial cable as DAS bidirectional distributed antenna

Reference. https://www.commscope.com/product-type/in-building-coverage/radiating-cables/

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