VDV Video Distribution 4

Question 1

What is the purpose of an EDID (Extended Display Identification Data) in an HDMI distribution system?

Accepted Answer

Communicate display capabilities to the video source

Answer

EDID is a data structure that a display sends to the source device describing its supported resolutions, refresh rates, and audio formats so the source can output compatible signals.

Question 2

In a structured cabling environment, which TIA/EIA standard governs the installation of coaxial cable for video applications?

Accepted Answer

TIA-570

Answer

TIA-570 is the Residential Telecommunications Cabling Standard that covers coaxial and twisted-pair cabling for video, voice, and data in residential and light commercial buildings.

Question 3

What is the video bandwidth required for a standard definition NTSC composite video signal?

Accepted Answer

4.2 MHz

Answer

NTSC composite video has a maximum luminance bandwidth of 4.2 MHz, which defines the cabling and amplifier requirements for SD video distribution.

Question 4

A technician measures 0.3 Vp-p on a composite video signal that should be 1.0 Vp-p. What is the most likely cause?

Accepted Answer

Excessive cable attenuation or a missing DA

Answer

A drastically low signal level indicates cable loss has not been compensated, or a required distribution amplifier is absent from the signal path.

Question 5

Which video format carries both video and audio over a single cable using a BNC connector?

Accepted Answer

SDI (Serial Digital Interface)

Answer

SDI carries uncompressed digital video with embedded audio channels multiplexed into the serial bitstream over a single 75-ohm coaxial cable with BNC connectors.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Video Distribution 4