DCI Testing & Troubleshooting 2

Question 1

A cable tester reports a 'split pair' fault. What does this indicate?

Accepted Answer

Two conductors from different pairs are wired together at one end

Answer

A split pair occurs when conductors from different pairs are used together, maintaining continuity but severely degrading crosstalk performance.

Question 2

What does OTDR stand for in fiber optic testing?

Accepted Answer

Optical Time Domain Reflectometer

Answer

An OTDR (Optical Time Domain Reflectometer) sends pulses of light and measures reflections to locate faults and measure loss along a fiber.

Question 3

When testing insertion loss on a fiber link, the measured value exceeds the channel limit. Which is the MOST likely cause?

Accepted Answer

Excessive number of connections or splices in the link

Answer

Each connector or splice adds loss; too many in a link can push total insertion loss beyond the channel budget.

Question 4

A technician finds that wire map shows pins 1 and 2 are reversed at the far end. This is called a:

Accepted Answer

Reversed pair

Answer

A reversed pair (also called a polarity reversal) occurs when both conductors of a pair are swapped at one end.

Question 5

Which parameter measures the signal strength difference between the transmitted signal and the near-end crosstalk?

Accepted Answer

Answer

NEXT (Near-End Crosstalk) measures unwanted signal coupling from one pair to another at the same end where the signal is transmitted.

(DCI) Data Cabling Installer Practice Test