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11
Appendix B Cable management
General cabling requirements
Minimum curvature radius of cables
•
Attached power cord, communication cable, or ribbon cable—A minimum of five times the
cable's outer diameter. If the cable is frequently bent, connected and removed, the curvature
radius must be a minimum of seven times the cable's outer diameter.
•
Ordinary attached coaxial cable—A minimum of seven times the cable's outer diameter. If the
coaxial cable is frequently bent, connected and removed, the curvature radius must be a
minimum of 10 times the cable's outer diameter.
•
High-speed cable (SFP+ cable for example)—A minimum of five times the cable's outer
diameter. If the coaxial cable is frequently bent, plugged and unplugged, the curvature radius
must be a minimum of 10 times the cable's outer diameter.
Minimum curvature radius of fibers
•
When the fiber is wrapped up around the cabling plate, the diameter of the cabling plate must
be a minimum of 25 times the fiber's diameter.
•
When the fiber is being moved, the curvature radius of the fiber must be a minimum of 20 times
the fiber's diameter.
•
When the fiber is attached, the curvature radius of the fiber must 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).
Cable binding guidelines
When you route and bundle up cables, follow these guidelines:
•
Label cables before you route or bundle them. For more information about labeling cables, see
"Appendix E Engineering labels."
•
Bind and route the cables neatly inside the rack, and make sure they are not kinked or bent.
Figure11-1 Correct and incorrect cable binding
Tangled
Bent
11-1
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