H3C SecPath M9000-AI-E8 Installation Manual page 119

General cabling requirements
Minimum curvature radius of cables
•
The curvature radius of an attached power cord, communication cable, or ribbon cable should
be at least five times the cable's outer diameter. If the cable is frequently bent, plugged and
unplugged, the curvature radius should be at least seven times the cable's outer diameter.
•
The curvature radius of an ordinary attached coaxial cable should be at least seven times of the
cable's outer diameter. If the coaxial cable is frequently bent, plugged and unplugged, the
curvature radius should be at least 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 should
be at least 25 times the fiber's diameter.
•
When the fiber is being moved, the curvature radius of the fiber should be at least 20 times the
fiber's diameter.
•
When the fiber is attached, the curvature radius of the fiber should be at least 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:
•
Bind and route the cables neatly inside the rack, and make sure they are not kinked or bent.
Figure 2 Correct and incorrect cable binding
Tangled
•
The cable bend radius at connectors must be at least 5 times the cable diameter, and must be
at least twice the cable diameter away from the connectors.
•
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 at least 30 mm (1.18 in).
Bent
2