ATP Structured Cabling & Connectivity 3 — Questions and Answers
Question 1: Which type of fiber optic cable is designed for long-distance backbone runs exceeding 2 km and uses a 9/125 µm core/cladding specification?
- Single-mode (OS2) (Correct answer)
- Multimode OM3
- Multimode OM4
- Multimode OM1
Correct answer: Single-mode (OS2)
OS2 single-mode fiber with a 9/125 µm specification supports transmission distances well beyond 2 km and is used for campus and long-haul backbone applications.
Question 2: In TIA-568 structured cabling, what does 'ELFEXT' measure?
- Equal Level Far-End CrossTalk, measuring far-end crosstalk relative to insertion loss (Correct answer)
- Electrical Low-Frequency Extinction Test for shielded cables
- End-Loop Fiber Extension Transmission test
- Equal Load Frequency Extension of crosstalk at near end
Correct answer: Equal Level Far-End CrossTalk, measuring far-end crosstalk relative to insertion loss
ELFEXT (Equal Level Far-End CrossTalk) measures far-end crosstalk normalized against insertion loss, providing a true signal-to-interference ratio at the far end.
Question 3: A technician is terminating a 110-style punch-down block. Which tool is required for proper termination?
- 110 punch-down tool with 110 blade (Correct answer)
- Krone punch-down tool
- BIX punch-down tool
- 66-block punch-down tool with 66 blade
Correct answer: 110 punch-down tool with 110 blade
A 110 punch-down tool with the correct 110-style blade is required; using a 66-blade or Krone blade will result in improper termination and potential damage to the IDC connector.
Question 4: What is the maximum pulling tension allowed for a 4-pair Cat 6 UTP cable during installation?
- 25 lbf (110 N) (Correct answer)
- 50 lbf (222 N)
- 10 lbf (44 N)
- 100 lbf (445 N)
Correct answer: 25 lbf (110 N)
TIA-568 limits maximum pulling tension to 25 lbf (110 N) for 4-pair UTP cable to prevent stretching the conductors and degrading electrical performance.
Question 5: Which structured cabling standard defines the specifications for telecommunications pathways and spaces (cable trays, conduits, equipment rooms)?
- TIA-569 (Correct answer)
- TIA-568
- TIA-606
- TIA-607
Correct answer: TIA-569
TIA-569 (Commercial Building Standard for Telecommunications Pathways and Spaces) governs the physical spaces and pathways through which cabling is routed.
Question 6: What is the maximum recommended fill ratio for a cable tray carrying only UTP horizontal cables?
- 50% (Correct answer)
- 100%
- 75%
- 25%
Correct answer: 50%
TIA-569 recommends a maximum 50% fill ratio for cable trays carrying UTP cables to allow for heat dissipation and future cable additions.
Question 7: A structured cabling installer needs to support 10GBASE-T at 100 meters. Which minimum cable category is required?
- Cat 6A (Correct answer)
- Cat 5e
- Cat 6
- Cat 7
Correct answer: Cat 6A
Cat 6A (Augmented Category 6) is the minimum category specified in IEEE 802.3an to support 10GBASE-T at the full 100-meter channel distance.
ATP Structured Cabling & Connectivity 3
Which type of fiber optic cable is designed for long-distance backbone runs exceeding 2 km and uses a 9/125 µm core/cladding specification?