8-2
Routing power cords
When you route power cords, take consideration of the layout of the equipment room, including the
locations of the power distribution cabinet, AC power receptacles, and lightning protection box. Place
all re-connecting facilities, such as receptacles, at the rack bottom (Do not place them at a location
out of the rack and easy to reach.)
The power modules are located at the left and right sides of the rear panel. As a best practice, route
power cords from the left and right sides of the rear panel.
General cabling requirements
Minimum curvature radius of cables
•
The curvature radius of an attached power cord, communication cable, or ribbon cable should
be a minimum of five times the cable's outer diameter. If the cable is frequently bent, plugged
and unplugged, the curvature radius should be a minimum of seven times the cable's outer
diameter.
•
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.
•
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
•
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.
•
When the fiber is being moved, the curvature radius of the fiber should be a minimum of 20
times the fiber's diameter.
•
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:
•
Bind and route the cables neatly inside the rack, and make sure they are not kinked or bent.