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200-301 · Question #974
200-301 Question #974: Real Exam Question with Answer & Explanation
The correct answer is B: Both have a 50 micron core diameter.. Both OM3 and OM4 fiber optical cables are types of multimode fiber that share a common core diameter of 50 microns. This characteristic allows them to transmit multiple light modes, distinguishing them from single-mode fiber.
Submitted by andreas_gr· Mar 5, 2026DOMAIN_LIST_MISSING_FOR_QUESTION
Question
What is a similarity OM3 and OM4 fiber optical cable?
Options
- ABoth have a 62.5 micron core diameter.
- BBoth have a 50 micron core diameter.
- CBoth have a 100 micron core diameter.
- DBoth have a 9 micron core diameter.
Explanation
Both OM3 and OM4 fiber optical cables are types of multimode fiber that share a common core diameter of 50 microns. This characteristic allows them to transmit multiple light modes, distinguishing them from single-mode fiber.
Common mistakes.
- A. A 62.5 micron core diameter is characteristic of older multimode fiber types, specifically OM1, not OM3 or OM4.
- C. A 100 micron core diameter is an older, less common multimode fiber size and not standard for OM3 or OM4.
- D. A 9 micron core diameter is characteristic of single-mode fiber (OS1/OS2), which transmits a single light mode over much longer distances than multimode fiber.
Concept tested. Multimode fiber core diameter (OM3, OM4)
Topics
#Multimode fiber#OM3#OM4#Fiber core diameter
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