15
2.
Clean the pins again by using lint-free cotton. If necessary, clean the pins by using an air gun.
Ensure that the pins are free from any fiber or debris.
To clean a fiber connector with guide pins:
1.
Fold a piece of lint-free cotton and dip it in alcohol. Then, use the cotton to clean the pins.
2.
Clean the pins again by using a new piece of lint-free cotton without alcohol.
3.
Use an air gun to remove any residual objects on the pins.
Managing cables
Figures in this section are for illustration only.
Label cables before you route or bundle them. For more information about labeling cables, see
"Appendix A Engineering labels."
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 of the cable’s outer diameter. If the cable is frequently bent,
connected and removed, 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, connected and removed,
the curvature radius should be a minimum of 10 times of the cable's outer diameter.
•
The curvature radius of a high-speed cable should be a minimum of five times of the cable's
outer diameter. If the coaxial cable is frequently bent, connected and removed, the curvature
radius should be a minimum of 10 times of 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 of the fiber's diameter.
•
When the fiber is being moved, the curvature radius of the fiber should be a minimum of 20
times of the fiber's diameter.
•
When the fiber is attached, the curvature radius of the fiber should be a minimum of 10 times of
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).
Cable management guidelines
When you route and bundle up cables, follow these guidelines:
•
Bind cables neatly for easy maintenance and expansion.
•
The cable management brackets and cable routing slots, inside or outside the rack, are smooth
and have no sharp edges or tips.
•
Route different types of cables (for example, power cords and signal cables) separately. If they
are close to one another, cross them over one another. If you route them in parallel, make sure
the space between a power cord bundle and a signal cable bundle is equal to or greater than 30
mm (1.18 in).
