RCDD Question #182: Real Exam Question with Answer & Explanation

The correct answer is B. 75. Coaxial cable used for broadband CATV distribution has a standardized impedance of 75 ohms. This impedance is distinct from the 50-ohm coax used in RF and data networking applications.

Question

What is the appropriate impedance of coaxial cable for use with broadband distribution?

Options

A50
B75
C100
D150

Explanation

Coaxial cable used for broadband CATV distribution has a standardized impedance of 75 ohms. This impedance is distinct from the 50-ohm coax used in RF and data networking applications.

Common mistakes.

A. 50-ohm coaxial cable is used in RF transmission, wireless antenna systems, and baseband data networking - not broadband CATV distribution.
C. 100-ohm is the impedance of balanced twisted-pair cabling such as Category cables used for Ethernet, not coaxial cable.
D. 150-ohm is not a standard impedance value for any common coaxial cable type used in commercial distribution systems.

Concept tested. Coaxial cable impedance for broadband CATV

Reference. https://www.scte.org/standards/library/catalog/scte-2-2020-environmental-qualification-testing-for-broadband-cable-telecommunications-equipment/

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