DCI Testing and Certification 3

Question 1

Which fiber optic test method uses a light source and power meter to measure end-to-end insertion loss?

Accepted Answer

Optical Loss Test Set (OLTS) method

Answer

The Optical Loss Test Set (OLTS) method, also called the light source and power meter (LSPM) method, is the standard bidirectional method for certifying fiber insertion loss.

Question 2

What TIA standard defines the required test methods and pass/fail criteria for copper cabling certification?

Accepted Answer

TIA-568-C.2

Answer

TIA-568-C.2 (Balanced Twisted-Pair Telecommunication Cabling and Components Standard) specifies transmission performance and field test requirements for copper cabling.

Question 3

A cable technician measures propagation delay and delay skew. What is delay skew?

Accepted Answer

The difference in propagation delay between the fastest and slowest pair in a cable

Answer

Delay skew is the difference in signal travel time between the fastest and slowest pairs in a cable, which must be within limits to ensure proper signal reconstruction.

Question 4

When certifying a fiber link per TIA-526-14, the bidirectional average insertion loss is required. Why are measurements taken in both directions?

Accepted Answer

Connector and splice losses can vary depending on the direction light travels

Answer

Connector losses are directional because the physical alignment of fiber cores at a mated pair can differ depending on which way light travels through the connection.

Question 5

What is the significance of the 'headroom' value reported by a cable certification tester?

Accepted Answer

The margin between the measured result and the pass/fail limit

Answer

Headroom indicates how far the measured performance is above or below the specification limit, with positive values indicating a margin of safety above the minimum requirement.

(DCI) Data Cabling Installer Practice Test

(DCI) Data Cabling Installer Practice Test

DCI Testing and Certification 3