VDV Copper Cabling 4

Question 1

When installing copper cabling near fluorescent lighting fixtures, what is the minimum separation distance recommended by TIA-569?

Accepted Answer

5 inches (12.7 cm)

Answer

TIA-569 recommends a minimum 5-inch separation between telecommunications cables and fluorescent fixtures to reduce EMI-induced noise.

Question 2

What is the purpose of the spline or cross-filler found inside some Cat6 cables?

Accepted Answer

Maintain pair separation to reduce crosstalk between the four pairs

Answer

The internal plastic spline physically separates the four pairs, maintaining consistent geometry that reduces near-end crosstalk in Cat6 cable.

Question 3

A field tester reports a 'split pair' fault. What wiring error causes this condition?

Accepted Answer

One conductor from two different pairs is wired together instead of using a matched pair

Answer

A split pair occurs when wires from two different pairs are used together as a pair, destroying the balanced transmission and drastically increasing crosstalk.

Question 4

Which copper cabling characteristic is expressed in decibels per 100 meters (dB/100m) and represents signal power lost along the cable?

Accepted Answer

Insertion loss (attenuation)

Answer

Insertion loss, also called attenuation, measures how much signal power is lost as it travels through the cable and is expressed as dB per unit length.

Question 5

In a T568A vs T568B comparison, which pairs are swapped between the two standards?

Accepted Answer

Pairs 2 and 3 (the green and orange pairs)

Answer

T568A and T568B differ only in the positions of the orange and green pairs (pairs 2 and 3); all other pairs remain in the same pin positions.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Copper Cabling 4