DCI Copper Installation 2 — Questions and Answers
Question 1: What is the maximum allowable pair untwist at a termination point for Category 6 copper cabling?
- 1/4 inch (6 mm) (Correct answer)
- 1/2 inch (13 mm)
- 3/4 inch (19 mm)
- 1 inch (25 mm)
Correct answer: 1/4 inch (6 mm)
ANSI/TIA-568 limits untwisting to no more than 1/4 inch (6 mm) at terminations to maintain crosstalk performance.
Question 2: Which tool is used to properly seat an RJ-45 plug onto a solid copper conductor?
- Punchdown tool
- Cable stripper
- Crimping tool (Correct answer)
- Krone tool
Correct answer: Crimping tool
A crimping tool is used to mechanically seat and lock the RJ-45 modular plug onto the cable conductors.
Question 3: What does 'pulling tension' refer to when installing copper cable?
- The force applied to strip cable jacket
- The maximum tensile load allowed during cable pull (Correct answer)
- The bend radius at a pull point
- The torque used on connector screws
Correct answer: The maximum tensile load allowed during cable pull
Pulling tension is the maximum force that can be applied to a cable during installation without damaging its electrical or mechanical characteristics.
Question 4: Which wiring standard uses the color sequence White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, Brown?
- T568A
- T568B (Correct answer)
- USOC
- EIA-310
Correct answer: T568B
T568B is the wiring standard with White/Orange on pin 1, which is the most commonly used standard in commercial US installations.
Question 5: What is the minimum bend radius for a 4-pair UTP cable during installation (under tension)?
- 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
Under tension during a pull, UTP cable must maintain a minimum bend radius of 8 times the cable's outer diameter.
Question 6: What test parameter measures the signal loss experienced as a signal travels along a copper cable?
- NEXT
- Return loss
- Insertion loss (attenuation) (Correct answer)
- Propagation delay
Correct answer: Insertion loss (attenuation)
Insertion loss (also called attenuation) measures the reduction in signal strength as it travels from one end of the cable to the other.
Question 7: When installing copper cable through a fire-rated wall, what is required?
- Use plenum-rated cable only
- Apply firestop material to seal the penetration (Correct answer)
- Install a metal conduit sleeve
- Mark the cable with red tape
Correct answer: Apply firestop material to seal the penetration
Any penetration through a fire-rated barrier must be sealed with approved firestop material to restore the fire rating of the assembly.
DCI Copper Installation 2
What is the maximum allowable pair untwist at a termination point for Category 6 copper cabling?