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Appendix E Cabling recommendations
When an S7500E switch is mounted in a 19” 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 right-rear 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, and connector strip, etc.) of the exchange office.
General cabling requirements
Minimum curvature radius of cables
• The curvature radius of a fixed 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 fixed 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.
• The curvature radius of a high-speed cable (for example, SFP+ cable) should be at least five 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 fixed, 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, 2.0 mm, or 3.0 mm (0.04 in, 0.08 in, or 0.12 in).
Correct use of labels
Before binding the cables, fill in the labels for them correctly and stick them to the right position on the
cables.
Cable management requirements
• Bind and put the cables inside the rack in an organized manner. Make sure the cables do not have
any kinks or sharp bends.
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