VDV Cabling Standards 3

Question 1

In the TIA-568 T568A and T568B wiring schemes, which pair is reversed between the two standards?

Accepted Answer

Pairs 2 and 3

Answer

T568A and T568B differ only in the position of pairs 2 (orange) and 3 (green), which are swapped between the two standards.

Question 2

What testing parameter measures the unwanted signal coupling from one pair to another at the near end of a cable?

Accepted Answer

Answer

NEXT (Near-End Crosstalk) measures electromagnetic coupling between pairs at the end closest to the signal source.

Question 3

According to TIA-569, what is the maximum fill ratio for conduit carrying communications cables?

Accepted Answer

53%

Answer

TIA-569 allows a maximum 53% fill ratio for conduit to allow cable movement and heat dissipation.

Question 4

Which fiber optic cable type is specified for backbone runs exceeding 300 meters per TIA-568?

Accepted Answer

OS1 singlemode

Answer

OS1 (or OS2) singlemode fiber supports backbone distances far exceeding 300 meters, up to kilometers depending on the application.

Question 5

What does 'ANSI/TIA-606' specifically govern in a structured cabling system?

Accepted Answer

Administration and labeling

Answer

TIA-606 covers the administration standard for telecommunications infrastructure, including labeling, records, and documentation.

(VDV) Voice Data Video Technician Certified Practice Test