DCI Testing & Troubleshooting 4

Question 1

What is the TIA-568 maximum allowable permanent link length for Category 6 horizontal cabling?

Accepted Answer

90 meters

Answer

TIA-568 limits the permanent link (from telecommunications outlet to patch panel) to 90 meters, with the remaining 10 meters allocated for patch cords.

Question 2

A technician is troubleshooting intermittent network connectivity. The cable certifies cleanly when tested cold. What should be suspected?

Accepted Answer

Thermal expansion causing intermittent contact failure at a connection point

Answer

Temperature changes can cause marginal terminations to expand and contract, creating intermittent contacts that pass when cool but fail under load or heat.

Question 3

Which tool measures optical power at the end of a fiber to determine insertion loss during an OLTS test?

Accepted Answer

Optical power meter

Answer

An optical power meter, used with a light source, measures the received power at the far end to calculate insertion loss during Optical Loss Test Set (OLTS) testing.

Question 4

A fiber link passes insertion loss but shows high reflectance. What is the most likely cause?

Accepted Answer

Physical contact (PC) connectors that are not properly mating

Answer

Poor physical contact between connector end faces creates an air gap that causes Fresnel reflections, increasing reflectance even if enough light passes for acceptable loss.

Question 5

When performing a wire map test, pins 3 and 6 are shown swapped at the remote end. Which pair is affected?

Accepted Answer

Pair 2 (orange)

Answer

In T568B wiring, pins 3 and 6 carry pair 2 (orange/orange-white); swapping them on the same pair would be a reversal, but if they are from different pairs it is a split pair.

(DCI) Data Cabling Installer Practice Test

(DCI) Data Cabling Installer Practice Test

DCI Testing & Troubleshooting 4