H3C S12500G-EF Series Installation Manual page 88

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The curvature radius of an ordinary attached coaxial cable should be a minimum of seven times
of the cable's outer diameter. If the coaxial cable is frequently bent, plugged and unplugged, the
curvature radius should be a minimum of 10 times the cable's outer diameter.
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The curvature radius of a high-speed cable (for example, SFP+ copper cable) should be a
minimum of five times of the cable's outer diameter. If the coaxial cable is frequently bent,
plugged and unplugged, the curvature radius should be a minimum of 10 times the cable's outer
diameter.
Minimum curvature radius of fibers
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When the fiber is wrapped up around the cabling plate, the diameter of the cabling plate should
be a minimum of 25 times the fiber's diameter.
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When the fiber is being moved, the curvature radius of the fiber should be a minimum of 20
times the fiber's diameter.
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When the fiber is attached, the curvature radius of the fiber should be a minimum of 10 times
the fiber's diameter.
NOTE:
The fiber's diameter refers to the outer diameter of the fiber jacket. Typically, the diameter of a
single-core fiber is 0.9 mm (0.04 in), 2.0 mm (0.08 in), or 3.0 mm (0.12 in).
Prerequisites
Label cables before you route or bundle them.
Cable management guidelines
When you route and bundle up cables, follow these guidelines:
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Bind and route the cables neatly inside the rack, and make sure they are not kinked or bent.
Figure 8-2 Correct and incorrect cable binding
Tangled
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The cable bend radius at connectors must be a minimum of 5 times the cable diameter, and
must be a minimum of twice the cable diameter away from the connectors.
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Route different types of cables (for example, power cords and signal cables) separately. If they
are close to one another, cross them over one another. If you route them in parallel, make sure
the space between a power cord bundle and a signal cable bundle is a minimum of 30 mm (1.18
in).
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The cable management brackets and cable routing slots, inside or outside the rack, are smooth
and have no sharp edges or tips.
Bent
8-2