Appendix D Cable management

When the router 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, depending on the available equipment room condition. The power cables run along the two sides of the front 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 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).

Labeling cables

Label cables before you route or bundle them. Labels are typically affixed 20 mm (0.79 in) to cable plugs.

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