DCI Copper Installation 3

Question 1

What is the primary reason copper cables should not be bundled tightly with cable ties over long runs?

Accepted Answer

It can deform the cable and increase alien crosstalk

Answer

Overtightening cable ties deforms the cable geometry, disrupts pair twists, and increases alien crosstalk (AXT) between adjacent cables.

Question 2

Which category of UTP cable first introduced alien crosstalk (AXT) testing as a required measurement?

Accepted Answer

Category 6A

Answer

Category 6A introduced mandatory alien crosstalk testing because at 10GBASE-T frequencies, interference between adjacent cables becomes significant.

Question 3

A cable tester reports 'FAIL – Wire Map: Pair Reversal on pair 2.' What does this indicate?

Accepted Answer

The two wires of pair 2 are swapped at one end

Answer

A pair reversal means the tip and ring (the two conductors) of a pair are swapped at one termination end.

Question 4

What does the acronym 'PSANEXT' stand for in copper cabling testing?

Accepted Answer

Power Sum Alien Near-End Crosstalk

Answer

PSANEXT (Power Sum Alien Near-End Crosstalk) measures the combined alien crosstalk interference from multiple surrounding cables at the near end.

Question 5

What is the standard maximum length for a horizontal cable run from the telecommunications room to the work area outlet?

Accepted Answer

90 meters

Answer

ANSI/TIA-568 specifies a maximum of 90 meters (295 feet) for permanent horizontal cabling, leaving 10 meters for patch cords and equipment cords.

(DCI) Data Cabling Installer Practice Test