VDV Cabling Infrastructure 5

Question 1

What is the minimum separation distance required between unshielded communications cables and open fluorescent lighting fixtures per TIA-569?

Accepted Answer

150 mm (6 inches)

Answer

TIA-569 requires at least 150 mm (6 inches) of separation between unshielded communications cables and open (unshielded) fluorescent light fixtures to reduce electromagnetic interference.

Question 2

A VDV technician is asked to install cabling in a riser between floors. Which cable jacket rating is required?

Accepted Answer

CMR

Answer

CMR (Communications Riser) rated cable is required for vertical runs between floors because it is designed to resist flame spread in vertical shafts without the full plenum rating.

Question 3

Which fiber optic test instrument measures the end-to-end insertion loss of a fiber link using a known light source?

Accepted Answer

Optical Power Meter with Light Source (OLTS)

Answer

An OLTS (Optical Loss Test Set) consisting of a calibrated light source and power meter measures total insertion loss through the entire fiber link, which is the required acceptance test per TIA-568.

Question 4

When pulling fiber optic cable through conduit, which method best protects the cable from damage?

Accepted Answer

Using a Kellems mesh grip sized to the cable OD

Answer

A Kellems (woven wire mesh) pulling grip distributes tension evenly along the cable jacket rather than concentrating stress at a single point, preventing damage to the fiber strands inside.

Question 5

What is the purpose of a telecommunications bonding backbone (TBB) conductor being sized larger as it gets longer per TIA-607?

Accepted Answer

To compensate for increased resistance over longer lengths and maintain bonding effectiveness

Answer

TIA-607 requires the TBB conductor to increase in cross-sectional area as its length increases so that DC resistance remains low, ensuring effective equalization of ground potential throughout the building.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Cabling Infrastructure 5