VDV Video Distribution 5

Question 1

In a CATV (cable television) distribution system, what device is used to combine multiple channel frequencies onto a single coaxial cable?

Accepted Answer

Combiner/multiplexer

Answer

A combiner (or RF multiplexer) passively merges multiple RF channel signals onto one coaxial cable for distribution without interference between channels.

Question 2

What is the function of a directional coupler in a CATV distribution system?

Accepted Answer

Tap off a portion of signal with minimal main-line loss

Answer

A directional coupler taps a small percentage of the signal power for a branch while allowing the majority of the signal to continue down the main cable with minimal loss.

Question 3

Which fiber optic connector type is most commonly used in professional video distribution over fiber?

Accepted Answer

SC or LC

Answer

SC and LC connectors are the standard single-mode and multimode fiber connectors used in professional video-over-fiber systems due to their low insertion loss and high precision alignment.

Question 4

A video over IP (VoIP video) system using MPEG-4 compression for distribution requires which network infrastructure consideration?

Accepted Answer

Sufficient bandwidth and QoS prioritization

Answer

Compressed video streams require guaranteed bandwidth and QoS (Quality of Service) settings to prevent packet loss, jitter, and latency that cause video artifacts.

Question 5

What is the purpose of a video equalizing amplifier in long-haul coaxial cable installations?

Accepted Answer

Compensate for frequency-dependent cable losses

Answer

Coaxial cable attenuates high frequencies more than low frequencies; an equalizing amplifier boosts higher frequencies proportionally to flatten the overall frequency response.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Video Distribution 5