H3C Technologies H3C SecPath U200-A U200-M U200-S - Manual (Page 71)

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Appendix C Cabling recommendations
When a UTM device is mounted in a 19-inch standard rack, the interface cables are routed through the
cable management brackets, bound at cabling racks on chassis sides, and then routed up or down to
pass through the chassis top or the raised floor, depending on the available equipment room condition.
The power cables run along the two sides of the chassis and out of the chassis either from the chassis
top or the raised floor depending on the equipment room conditions (power distribution cabinet,
lightning protection box, connector strip, and so on) of the exchange office.
General cabling requirements
Minimum curvature radius of cables
• The curvature radius of an attached power cable, 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).
Before binding the cables, fill in the labels for them correctly and stick them to the right position on the
cables.
Cable management requirements
When you route and bundle up cables, follow these guidelines:
• Bind and route cables neatly inside the rack, and make sure they are not kinked or bent.