BICSI Certification BICSI Copper Cabling Systems 2 — Questions and Answers
Question 1: What does 'return loss' measure in a copper cabling channel?
- The signal that returns to the source due to impedance mismatches (Correct answer)
- The signal that is lost during transmission due to cable attenuation
- The noise introduced by adjacent power cables
- The delay between pairs in a cable
Correct answer: The signal that returns to the source due to impedance mismatches
Return loss measures the ratio of the reflected signal to the incident signal, caused by impedance mismatches along the cabling channel.
Question 2: In BICSI copper cabling, what is the maximum frequency specified for Category 6A channel performance testing?
- 100 MHz
- 250 MHz
- 500 MHz (Correct answer)
- 1000 MHz
Correct answer: 500 MHz
Category 6A channel performance is specified and tested up to 500 MHz per ANSI/TIA-568-C.2.
Question 3: Which BICSI-recommended practice applies when copper cabling must cross an EMI source such as a fluorescent light ballast?
- Route cables parallel to the EMI source as long as possible
- Cross at a 90-degree angle and minimize parallel routing near the source (Correct answer)
- Increase cable pairs to offset interference effects
- Switch from UTP to coaxial cable for the full run
Correct answer: Cross at a 90-degree angle and minimize parallel routing near the source
BICSI recommends crossing EMI sources at a 90-degree angle and minimizing parallel routing near the source to reduce electromagnetic interference coupling.
Question 4: What is the minimum Category of twisted-pair cabling required to support PoE Type 4 (IEEE 802.3bt, 90W) per TIA recommendations?
- Category 5e
- Category 6 (Correct answer)
- Category 6A
- Category 7
Correct answer: Category 6
TIA recommends Category 6 or higher cabling for PoE Type 4 applications to handle the higher current and heat generated by 90W PoE systems.
Question 5: In a BICSI field test report for copper cabling, what does 'FAIL*' (with an asterisk) typically indicate?
- The channel passed all tests
- The result is within the measurement uncertainty margin (a marginal pass or fail) (Correct answer)
- The cable was not tested at all required frequencies
- The test instrument needs calibration
Correct answer: The result is within the measurement uncertainty margin (a marginal pass or fail)
A FAIL* (asterisk) result indicates that the measurement is within the instrument's measurement uncertainty margin, meaning the result is marginal and could be a pass or fail depending on actual conditions.
Question 6: What is the purpose of a 'wiremap' test in copper cabling certification?
- To measure signal attenuation across all pairs
- To verify that each conductor is connected to the correct pin at both ends (Correct answer)
- To determine the characteristic impedance of the cable
- To measure alien crosstalk between adjacent cables
Correct answer: To verify that each conductor is connected to the correct pin at both ends
A wiremap test verifies that each conductor is connected to the correct pin at both cable ends, detecting opens, shorts, reversed pairs, crossed pairs, and split pairs.
BICSI Certification BICSI Copper Cabling Systems 2
What does 'return loss' measure in a copper cabling channel?