Video Distribution Flashcards
7 cards from real VDV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Video Distribution flashcards as text
In a CATV (cable television) distribution system, what device is used to combine multiple channel frequencies onto a single coaxial cable?
Answer: Combiner/multiplexer
A combiner (or RF multiplexer) passively merges multiple RF channel signals onto one coaxial cable for distribution without interference between channels.
What is the function of a directional coupler in a CATV distribution system?
Answer: Tap off a portion of signal with minimal main-line loss
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.
Which fiber optic connector type is most commonly used in professional video distribution over fiber?
Answer: SC or LC
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.
A video over IP (VoIP video) system using MPEG-4 compression for distribution requires which network infrastructure consideration?
Answer: Sufficient bandwidth and QoS prioritization
Compressed video streams require guaranteed bandwidth and QoS (Quality of Service) settings to prevent packet loss, jitter, and latency that cause video artifacts.
What is the purpose of a video equalizing amplifier in long-haul coaxial cable installations?
Answer: Compensate for frequency-dependent cable losses
Coaxial cable attenuates high frequencies more than low frequencies; an equalizing amplifier boosts higher frequencies proportionally to flatten the overall frequency response.
In an AV-over-IP distribution system, what protocol is commonly used for multicast video streaming to multiple displays?
Answer: IGMP-managed multicast
IGMP (Internet Group Management Protocol) enables managed multicast, allowing a single video stream to be received by multiple endpoints without duplicating unicast traffic for each display.
When a video technician notices picture rolling or loss of vertical sync on an analog monitor, what is the most likely cause?
Answer: Corrupted or missing vertical sync pulses
Vertical sync pulses instruct the display when to begin each new frame; if they are missing or corrupt, the display cannot lock onto the frame timing and the picture rolls.