• Use plenum-rated cable when it is necessary for safety and fire rating requirements. Consult your
local building codes to determine when it is appropriate to use plenum-rated cable, or refer to IEC
standard 850.
• Keep all ports and connectors free of dust.
Figure 30: Properly Installed and Bundled Cable
1 = Ensure adequate slack and bend radius
Handling Fiber Optic Cable
Fiber optic cable must be handled carefully during installation.
Every cable has a minimum bend radius, example, and fibers will be damaged if the cables are bent too
sharply. It is also important not to stretch the cable during installation. Ensure that the bend radius for
fiber optic cables is equal to at least 5 cm (2 in) for each 90-degree turn as shown in Figure 31.
Note
Kinks and sharp bends can destroy or impair the cable’s ability to convey light pulses
accurately from one end of the cable to the other. Use care in dressing the optical fiber cables:
provide satisfactory strain relief to support the cable and maintain an adequate bend radius at
all cable turns, particularly where the cable connects to the I/O module.
Site Preparation Installing Cable
ExtremeSwitching 5420 Series Hardware Installation Guide 41
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