CFOT Fiber Optic Standards and Regulations 2 — Questions and Answers
Question 1: The National Electrical Code (NEC) Article 770 specifically regulates which aspect of fiber optics?
- Installation of optical fiber cables in buildings (Correct answer)
- Fiber optic connector performance
- Wavelength standards for fiber systems
- OTDR testing procedures
Correct answer: Installation of optical fiber cables in buildings
NEC Article 770 covers the safe installation of optical fiber cables, including fire-resistance ratings and routing within buildings.
Question 2: What does the 'OM' classification system define for multimode fiber?
- Optical Multimode performance categories from OM1 to OM5 (Correct answer)
- Output Mode efficiency ratings
- Optical Manufacturer identification codes
- Outside Media cable ratings
Correct answer: Optical Multimode performance categories from OM1 to OM5
The OM classification (OM1–OM5) defines multimode fiber performance tiers based on bandwidth and supported transmission distances.
Question 3: Which standard defines the OS1 and OS2 categories for single-mode optical fiber?
- ISO/IEC 11801 (Correct answer)
- TIA-568-C
- IEC 60793-2-50
- ANSI/TIA-526-7
Correct answer: ISO/IEC 11801
ISO/IEC 11801 defines OS1 and OS2 as performance categories for single-mode fiber used in premises and outside plant applications.
Question 4: What is the minimum bend radius typically specified by TIA-568 for a 2mm fiber optic patch cord under load?
- 25 mm (Correct answer)
- 10 mm
- 50 mm
- 15 mm
Correct answer: 25 mm
TIA-568 specifies a minimum bend radius of 25 mm (about 1 inch) for 2mm fiber optic patch cords under tension.
Question 5: Under NEC Article 770, which cable jacket rating is required for fiber optic cables installed in plenums?
- OFNP (Optical Fiber Nonconductive Plenum) (Correct answer)
- OFNR (Optical Fiber Nonconductive Riser)
- OFN (Optical Fiber Nonconductive)
- OFCG (Optical Fiber Conductive General)
Correct answer: OFNP (Optical Fiber Nonconductive Plenum)
OFNP-rated cables have low-smoke, low-flame jackets required by the NEC for installation in air-handling plenum spaces.
Question 6: Which TIA standard specifically addresses OTDR measurements for single-mode fiber cable plants?
- ANSI/TIA-526-7 (Correct answer)
- ANSI/TIA-526-14
- TIA-568-C.3
- TIA-606-B
Correct answer: ANSI/TIA-526-7
ANSI/TIA-526-7 defines OTDR measurement methods for installed single-mode fiber optic cable plants.
CFOT Fiber Optic Standards and Regulations 2
The National Electrical Code (NEC) Article 770 specifically regulates which aspect of fiber optics?