VDV Cabling Standards 5 — Questions and Answers
Question 1: Which TIA standard governs the design and layout of telecommunications rooms (TR) and equipment rooms (ER)?
- TIA-568-C
- TIA-569-D (Correct answer)
- TIA-606-B
- TIA-942
Correct answer: TIA-569-D
TIA-569 covers pathways and spaces including telecommunications rooms, equipment rooms, and entrance facilities.
Question 2: What is the correct term for the point in a structured cabling system where outside plant cabling transitions to inside plant cabling?
- Main Cross-Connect (MC)
- Intermediate Cross-Connect (IC)
- Entrance Facility (EF) (Correct answer)
- Horizontal Cross-Connect (HC)
Correct answer: Entrance Facility (EF)
The Entrance Facility is where outside plant cables enter the building and connect to the inside telecommunications infrastructure.
Question 3: In fiber optic testing, what does an OTDR measure to locate a splice or connector along a cable run?
- Voltage reflections on the fiber
- Time delay of backscattered light pulses (Correct answer)
- Power output at the far end
- Wavelength shift caused by bending
Correct answer: Time delay of backscattered light pulses
An OTDR sends light pulses and measures the time it takes for backscattered light to return, calculating distance to any event or fault.
Question 4: Which wiring standard requires that the green pair be placed on pins 1 and 2 of an 8P8C outlet?
- T568A (Correct answer)
- T568B
- USOC
- EIA-232
Correct answer: T568A
T568A places the green pair (pair 3) on pins 1-2 and the orange pair (pair 2) on pins 3-6.
Question 5: What is the maximum number of consolidation points (CPs) permitted in a single horizontal link per TIA-568?
- 1 (Correct answer)
- 2
- 3
- Unlimited
Correct answer: 1
TIA-568 permits only one consolidation point per horizontal link to limit the number of connection points and maintain performance.
Question 6: Which cabling component is used at the work area to transition from solid-conductor horizontal cable to stranded-conductor patch cords?
- Patch panel
- Telecommunications outlet/connector (TO) (Correct answer)
- Consolidation point
- Cross-connect block
Correct answer: Telecommunications outlet/connector (TO)
The telecommunications outlet (TO) provides the wall-mounted 8P8C jack where solid horizontal cable terminates and stranded patch cords connect equipment.
Question 7: What is the primary reason Cat6A UTP cables are physically larger in diameter than Cat6 cables?
- They use larger gauge conductors to reduce resistance
- They have additional insulation to improve fire ratings
- They use individual pair shielding within the cable
- They require thicker insulation and a larger pair separator to manage alien crosstalk (Correct answer)
Correct answer: They require thicker insulation and a larger pair separator to manage alien crosstalk
Cat6A cables are larger because they need a thicker jacket and internal pair separators to reduce alien crosstalk (AXT) at 500 MHz frequencies.
VDV Cabling Standards 5
Which TIA standard governs the design and layout of telecommunications rooms (TR) and equipment rooms (ER)?