CDCP Structured Cabling and Standards 5

Question 1

What is the recommended maximum fill ratio for a cable tray carrying data cables in a data centre?

Accepted Answer

50%

Answer

Industry best practice and most standards recommend filling cable trays to no more than 50% capacity to allow for heat dissipation and future cable additions.

Question 2

What does 'return loss' measure in a structured cabling link?

Accepted Answer

Signal energy reflected back toward the transmitter due to impedance mismatches

Answer

Return loss measures the amount of signal reflected back toward the transmitter caused by impedance discontinuities at connectors, splices, or changes in cable type.

Question 3

In TIA-942, what is the Main Distribution Area (MDA) responsible for?

Accepted Answer

Central cross-connection point for core networking equipment and the primary entrance facility

Answer

The MDA is the core distribution area that houses main switching and routing equipment and serves as the primary cross-connection point for the entire data centre.

Question 4

Which standard defines the color-coding and administration requirements for data centre telecommunications infrastructure?

Accepted Answer

ANSI/TIA-606

Answer

ANSI/TIA-606 'Administration Standard for Telecommunications Infrastructure' defines the labeling, color-coding, and record-keeping requirements for structured cabling systems.

Question 5

What is the maximum distance specified for horizontal cabling in a data centre under ANSI/TIA-942?

Accepted Answer

100 meters (328 ft)

Answer

ANSI/TIA-942 adopts the ANSI/TIA-568 channel limit of 100 meters for horizontal copper cabling, which includes 90m of permanent link plus up to 10m for patch cords.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP Structured Cabling and Standards 5