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Evaluating and Meeting Cable Requirements
BlackDiamond 8800 Series Switches Hardware Installation Guide
63
Fiber Optic Cable
Fiber optic cable must be handled carefully during installation. Every cable has a minimum bend
radius, for example, and fibers will be damaged if the cables are bent too sharply. It is also important
not to stretch the cable during installation. We recommend that the bend radius for fiber optic cable
equal 2 inches (5.08 cm) minimum for each 90 degree turn as shown in Figure 32.
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.
Figure 32: Bend Radius for Fiber Optic Cable
Cable Distances
Table 12 shows cable media types and maximum distances that support reliable transmission in
accordance with international standards, except where noted.
Table 12: Media Types and Maximum Distances
Standard Media Type
Mhz•Km
Rating
Maximum Distance
(Meters)
1000BASE-SX
(850 nm optical
window)
50/125 μm multimode fiber
50/125 μm multimode fiber
62.5/125 μm multimode fiber
62.5/125 μm multimode fiber
400
500
160
200
500
550
220
275
1000BASE-LX
(1300 nm optical
window)
50/125 μm multimode fiber
50/125 μm multimode fiber
62.5/125 μm multimode fiber
10/125 μm single-mode fiber
10/125 μm single-mode fiber*
400
500
500
–
–
550
550
550
5,000
10,000
1000BASE-LX70
(1550 nm optical
window)
10/125 μm single-mode fiber – 70,000
SPG_002
Minimum
2-in. (5.08-cm)
radius
in 90∞ bend
90∞
Optical fiber cable