Hardware Installation and Reference Guide Appendixes
27
7.2 Cabling Recommendations
During installation, route cable bundles upward or downward along the sides of the rack
depending on the actual situation in the equipment room. All cable connectors used for transit
should be placed at the bottom of the cabinet rather than be exposed outside of the cabinet.
Power cords are routed beside the cabinet, and top cabling or bottom cabling is adopted
according to the actual situation in the equipment room, such as the positions of the DC power
distribution box, AC socket, or lightning protection box.
7.2.1 Requirements for Cable Bend Radius
The bend radius of a fixed power cord, network cable, or flat cable should be over five times
greater than their respective diameters. The bend radius of these cables that are often bent
or plugged should be over seven times greater than their respective diameters.
The bend radius of a fixed common coaxial cable should be over seven times greater than
its diameter. The bend radius of the common coaxial cable that is often bent or plugged
should be over 10 times greater than its diameter.
The bend radius of a fixed high-speed cable (such as an SFP+ cable) should be over five
times greater than its diameter. The bend radius of the fixed high-speed cable that is often
bent or plugged should be over 10 times greater than its diameter.
7.2.2 Precautions for Bundling up Cables
Before cables are bundled, mark labels and stick the labels to cables wherever appropriate.
Cables should be neatly and properly bundled in the rack without twisting or bending.
Figure 7-3 Bundling up Cables (1)
Cables of different types (such as power cords, signal cables, and grounding cables) should
be separated in cabling and bundling. Mixed bundling is disallowed. When they are close to
each other, you are advised to adopt crossover cabling. In the case of parallel cabling,
maintain a minimum distance of 30 mm (1.18 in.) between power cords and signal cables.
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