•
10 times the cable's outside diameter under no pull load
•
15 times the cable's outside diameter when subject to tensile load.
There are two types of bend radii:
•
The dynamic bend radius is the tightest recommended bend while installing cable at the maximum rated
tension. It is the larger of the two specified bend radii (see figure below). Throughout the pull, the
minimum bend radius must be strictly followed. If a location exists in the middle of a run where a
relatively tight bend is unavoidable, the cable should be hand-fed around the bend or a pulley can be
used.
•
The static bend radius is the tightest recommended bend while the cable is under a minimum tension. It
is the smaller of the two specified bend radii. After the pull is complete, the cable can be bent more
tightly to fit into existing space, but not to exceed the long term minimum bend radius.
Always follow the manufacturer's guidelines for minimum bend radius and tension. Failure to do so may
result in high attenuation (macrobends) and possible damage to the cable and fiber. Guidelines are normally
supplied with the cable manufacturer specification sheets. If the bend radius specifications are unknown, the
recommendation is to maintain a minimum radius of 20 times the diameter of the cable.
Figure 18: Recommended Fiber Optic Bend Radii
Bend-Insensitive Multimode Fiber
An alternative for maintaining tighter than recommended bend radii is use of Bend-Insensitive Multimode
Fiber (BIMMF). BIMMF is more impervious to bend loss than standard 50-micron multimode fiber (MMF)
cable.
BIMMF cables are only optimized for 850nm wavelengths and not for 1300nm wavelengths.Important
ASR 5500 Installation Guide
69
MIO Port Cabling
Bend-Insensitive Multimode Fiber
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