BICSI Certification BICSI Copper Cabling Systems

Question 1

What is the characteristic impedance of standard twisted-pair telecommunications cabling as specified in ANSI/TIA-568?

Accepted Answer

100 ohms

Answer

ANSI/TIA-568 specifies 100 ohms as the characteristic impedance for twisted-pair telecommunications cabling used in horizontal and backbone applications.

Question 2

Which test parameter measures the difference in attenuation between a pair and the crosstalk on that same pair, indicating signal-to-noise margin?

Accepted Answer

ACR-N (Attenuation-to-Crosstalk Ratio, Near-end)

Answer

ACR-N (Attenuation-to-Crosstalk Ratio, Near-end) measures the difference between signal attenuation and NEXT, indicating the available signal-to-noise margin at the near end.

Question 3

What is 'alien crosstalk' (AXT) in copper cabling systems, and which category of cable introduced it as a critical test parameter?

Accepted Answer

Crosstalk from adjacent cables in a bundle; became critical with Category 6A

Answer

Alien crosstalk is electromagnetic interference coupling from adjacent cables (rather than pairs within the same cable) and became a critical test parameter with the introduction of Category 6A cabling for 10GBASE-T.

Question 4

In a punch-down (IDC) termination, what is the correct technique to minimize crosstalk degradation?

Accepted Answer

Maintain pair twist as close to the termination point as possible (max 13 mm untwist)

Answer

To minimize crosstalk, pairs should be maintained with their twist as close to the termination point as possible, with a maximum untwist of 13 mm (0.5 inches) per ANSI/TIA-568.

Question 5

What is the maximum allowed propagation delay for a Category 6 channel at 100 MHz?

Accepted Answer

498 ns

Answer

The maximum allowed propagation delay for a Category 6 channel at 100 MHz is 498 nanoseconds, as specified in ANSI/TIA-568-C.2.

BICSI Certification Practice Test

BICSI Certification Practice Test

BICSI Certification BICSI Copper Cabling Systems