DCI Copper Cable Termination 3

Question 1

Which of the following is a characteristic unique to shielded twisted pair (STP) termination compared to UTP?

Accepted Answer

The shield must be bonded to the connector's grounding point

Answer

STP terminations require the foil or braid shield to be properly bonded to the connector's grounding element to maintain EMI protection.

Question 2

A Cat 6 horizontal link passes all wire-map tests but fails the NEXT (near-end crosstalk) limit. The MOST likely cause is:

Accepted Answer

Excessive pair untwisting at the termination point

Answer

Untwisting pairs beyond the 13 mm limit significantly degrades NEXT performance at the termination.

Question 3

When does a 'crossed pair' fault appear on a cable tester?

Accepted Answer

When conductors from two different pairs are terminated on pins belonging to a third pair

Answer

A crossed pair occurs when wires from two pairs swap their pin positions, mixing pair identities across the termination.

Question 4

What is the recommended minimum distance between copper data cable and a 120V electrical conduit running parallel?

Accepted Answer

50 mm (2 in)

Answer

TIA-569 specifies a minimum 50 mm (2-inch) separation from unshielded power conductors carrying 120V.

Question 5

A technician terminates both ends of a cable using T568A at one end and T568B at the other. The result is:

Accepted Answer

A crossover cable

Answer

Mixing T568A at one end and T568B at the other reverses pairs 2 and 3, creating a crossover cable.

(DCI) Data Cabling Installer Practice Test