VDV Cabling Standards 4 — Questions and Answers
Question 1: What is the maximum recommended distance between cable support points for horizontal UTP cable runs per TIA-569?
- 0.9 meters (3 ft) (Correct answer)
- 1.5 meters (5 ft)
- 2.4 meters (8 ft)
- 4.5 meters (15 ft)
Correct answer: 0.9 meters (3 ft)
TIA-569 recommends cable supports at no more than 0.9 meter (3 ft) intervals for horizontal UTP to prevent sagging and stress.
Question 2: In a TIA-568 structured cabling system, what is the purpose of the Intermediate Cross-Connect (IC)?
- To connect workstation equipment to the network
- To interconnect backbone cabling between the main and horizontal cross-connects (Correct answer)
- To terminate horizontal cable runs from work areas
- To house the demarcation point for outside plant
Correct answer: To interconnect backbone cabling between the main and horizontal cross-connects
The IC provides an optional third-level connection point between the MC (Main Cross-Connect) and HC (Horizontal Cross-Connect) in large campus backbones.
Question 3: Which parameter specifically measures the difference between the crosstalk introduced at the far end from multiple disturbing pairs?
- NEXT
- PS-FEXT (Correct answer)
- Return Loss
- PSNEXT
Correct answer: PS-FEXT
PS-FEXT (Power Sum Far-End Crosstalk) combines the crosstalk contributions from multiple disturbing pairs at the far end of the cable.
Question 4: What is the minimum separation between AC power conduit and telecommunications conduit when running parallel per TIA-569?
- 2 inches (50 mm)
- 6 inches (150 mm) (Correct answer)
- 12 inches (300 mm)
- 24 inches (600 mm)
Correct answer: 6 inches (150 mm)
TIA-569 requires a minimum 150 mm (6 inch) separation between power and telecommunications conduits running in parallel to reduce EMI.
Question 5: According to ANSI/TIA-568, which Cat cable category first introduced augmented specifications to support 10GBase-T at full 100-meter channel length?
- Cat5e
- Cat6
- Cat6A (Correct answer)
- Cat7
Correct answer: Cat6A
Cat6A (Augmented Category 6) was specifically designed to support 10GBase-T Ethernet at 100-meter channel distances.
Question 6: What type of connector is specified by TIA-568 as the standard 8-position modular connector for UTP data cabling?
- RJ-11
- RJ-45 (8P8C) (Correct answer)
- 110-block
- BNC
Correct answer: RJ-45 (8P8C)
TIA-568 specifies the 8P8C modular plug/jack (commonly called RJ-45) as the standard connector for horizontal UTP data cabling.
Question 7: When performing optical fiber end-face inspection per TIA-526, a scratched or contaminated connector will most directly affect which measurement?
- Wavelength
- Optical Return Loss and Insertion Loss (Correct answer)
- Cable bend radius compliance
- OTDR event spacing
Correct answer: Optical Return Loss and Insertion Loss
Contaminated fiber end-faces increase insertion loss and degrade optical return loss, causing link failures.
VDV Cabling Standards 4
What is the maximum recommended distance between cable support points for horizontal UTP cable runs per TIA-569?