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Coaxial Cabling

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Coaxial cabling is a type of cable used for transmitting high-frequency signals (such as radio or television) and data. It consists of a central copper conductor surrounded by a layer of insulating material, a conductive shield, and a final insulating outer layer. The shielding in coaxial cables pr…

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CompTIA A+ - Coaxial Cabling Example Questions

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Question 1

When considering the deployment of internet services in an area with high electrical interference, which type of coaxial cable should be recommended to ensure signal integrity?

Correct Answer: RG-11

RG-11 coaxial cable is recommended when deploying internet services in areas with high electrical interference due to its thicker dielectric insulation and better shielding, which result in lower signal loss. This makes it more resistant to interference compared to other types of coaxial cables. RG-58 and RG-59 cables are thinner and commonly used for low-power applications; they do not offer the same level of interference resistance as RG-11 and are not as suitable for environments with high electrical noise. RG-8 is a thicker cable often used for ham radio transmissions and can be equivalent in shielding to RG-11, but it is less commonly used for internet services, and might not always be as readily available as RG-11.

Question 2

A technician is assessing a coaxial cable installation for a client's network. They notice impedance mismatches causing signal reflection. Which tool should the technician use to identify the location of the mismatch?

Correct Answer: Time Domain Reflectometer (TDR)

A Time Domain Reflectometer (TDR) is the best tool to identify the location of impedance mismatches causing signal reflection in a coaxial cable installation. A TDR sends a pulse down the cable and measures the time and amplitude of any reflections caused by impedance mismatches. By analyzing the reflected signals, the technician can determine the exact location of the mismatch along the cable length. An ohmmeter or multimeter cannot pinpoint the location of the mismatch, as they only measure the overall resistance or impedance of the cable. A signal generator is used to inject signals into the cable but does not provide information about the location of any reflections or mismatches.

Question 3

You have been asked to replace an old coaxial cable running from the demarcation point to the customer premises. The old cable was installed under the ground. What type of cable should you use for the replacement?

Correct Answer: Direct Burial Coaxial

A Direct Burial Coaxial cable is the best type of cable for replacing the old one in this scenario. This is because this specific cable has been designed and constructed to withstand outdoor elements, including the persistent moisture in the ground, making it the most suitable for underground installation. The RG-6, RG-8, and RG-11 cables, while all types of coaxial cables, are not specifically designed for direct burial applications, making them more susceptible to damage when installed underground.

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