Exam CDCP Topic 8 Question 6 Discussion

Actual exam question for EXIN's CDCP exam
Question #: 6
Topic #: 8
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?

Suggested Answer: B Vote an answer

Optical fiber cables are composed of a core, a cladding, and a coating. The core is the central part of the fiber that carries the light signal. The cladding is the layer surrounding the core that reflects the light back into the core and prevents signal loss. The coating is the protective layer that covers the cladding and provides mechanical strength and environmental protection. The specifications of an optical fiber cable indicate the dimensions of the core and the cladding in microns (#m), which are one millionth of a meter. For example, a
50/125 #m cable has a core diameter of 50 #m and a cladding diameter of 125 #m. The coating diameter is usually 250 #m, but it is not part of the specifications.
References: Multimode Optical Fiber Selection & Specification - Corning, Optical Fiber OM3 (50/125µm Multimode Fiber), 50/125 Graded-Index OM2 Optical Fiber - OFS

by Caesar at Mar 09, 2026, 06:08 AM

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