VDV Cabling Standards 2 — Questions and Answers
Question 1: What is the maximum channel length for a Cat6A horizontal run per TIA-568 standards?
- 90 meters (Correct answer)
- 100 meters
- 110 meters
- 55 meters
Correct answer: 90 meters
TIA-568 specifies 90 meters for the permanent link (horizontal run), with the remaining 10 meters allocated for patch cords.
Question 2: Which ANSI/TIA standard specifically addresses grounding and bonding for telecommunications systems?
- TIA-568-C
- TIA-607-C (Correct answer)
- TIA-569-D
- TIA-606-C
Correct answer: TIA-607-C
TIA-607-C covers commercial building grounding and bonding requirements for telecommunications.
Question 3: What does the term 'permanent link' refer to in structured cabling?
- The cable from the demarcation point to the MDF
- The fixed installed cable from the telecommunications outlet to the patch panel, excluding patch cords (Correct answer)
- Any cable that cannot be moved after installation
- The backbone cable between floors
Correct answer: The fixed installed cable from the telecommunications outlet to the patch panel, excluding patch cords
The permanent link is the installed horizontal cabling segment tested without patch cords, measured from the back of the outlet to the back of the patch panel.
Question 4: According to TIA-568, what is the minimum bend radius for 4-pair UTP cable during installation?
- 4 times the cable diameter
- 8 times the cable diameter (Correct answer)
- 10 times the cable diameter
- 15 times the cable diameter
Correct answer: 8 times the cable diameter
TIA-568 requires a minimum bend radius of 8 times the cable outer diameter for 4-pair UTP during installation.
Question 5: Which cabling standard introduced the concept of the 'channel' measurement that includes patch cords?
- EIA-568A
- ANSI/TIA-568-B (Correct answer)
- ISO/IEC 11801
- BICSI TDMM
Correct answer: ANSI/TIA-568-B
TIA-568-B formalized the channel model that includes the permanent link plus all patch cords up to 100 meters total.
Question 6: What fire rating is required for plenum-rated cables installed in air-handling spaces per NEC Article 800?
- CM
- CMR
- CMP (Correct answer)
- CMX
Correct answer: CMP
CMP (Communications Multipurpose Plenum) is required in plenum air-handling spaces because it has low smoke and flame spread ratings.
Question 7: What is the maximum pulling tension allowed for 4-pair Cat6 UTP cable during installation?
- 25 lbf (Correct answer)
- 35 lbf
- 50 lbf
- 110 lbf
Correct answer: 25 lbf
TIA-568 limits pulling tension to 25 lbf (110 N) for 4-pair UTP to prevent stretching the conductors and degrading performance.
VDV Cabling Standards 2
What is the maximum channel length for a Cat6A horizontal run per TIA-568 standards?