Exin Certified Data Centre Professional (CDCP) CDCP Question # 6 Topic 1 Discussion
CDCP Exam Topic 1 Question 6 Discussion:
Question #: 6
Topic #: 1
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?
A.
The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.
B.
The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.
C.
The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.
D.
The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
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 (μm), which are one millionth of a meter. For example, a 50/125 μm cable has a core diameter of 50 μm and a cladding diameter of 125 μm. The coating diameter is usually 250 μm, but it is not part of the specifications.
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