FXT 5000 Series Installation Guide
5.4.1 Guidelines for 25GbE Optical Cables
This table shows the specifications and operating range for optical cables used with the FXT 5850 at the 25 Gigabit
Ethernet data rate.
Fiber Type
Overfilled Launch
(OFL) Bandwidth at
850 nm (MHz*km)
Effective Modal
Bandwidth (EMB)
at 850 nm (MHz*km)
Operating Range
(meters)
50/125
𝜇
m OM3/M5E MMF
1500
2000
2 to 70
50/125
𝜇
m OM4/M5F MMF
3500
4700
2 to 100
5.4.2 Guidelines for 10GbE Optical Cables
This table shows the specifications and operating range for optical cables used with the FXT 5200, FXT 5400, FXT
5600, and FXT 5850 at the 10 Gigabit Ethernet data rate.
10GbE Optical Cable Guidelines
Fiber Type
Overfilled Launch
(OFL) Bandwidth at
850 nm (MHz*km)
Effective Modal
Bandwidth (EMB)
at 850 nm (MHz*km)
Operating Range
(meters)
62.5/125
𝜇
m MMF
160
N/A
2 to 26
62.5/125
𝜇
m OM1/M6 MMF
200
N/A
2 to 33
50/125
𝜇
m MMF
400
N/A
2 to 66
50/125
𝜇
m OM2/M5 MMF
500
N/A
2 to 82
50/125
𝜇
m OM3/M5E MMF
1500
2000
2 to 300
5.4.3 Guidelines for 25GbE Copper Cables
When using 25GbE copper twinaxial cables with the FXT 5850 25GbE ports, the cables must meet these require-
ments to provide full 25GbE port speed:
• Use SFP28 direct-attach cables.
• Only passive type cables are supported. Active twinax and active optical cables (AOC) are not supported.
• For passive cables, the maximum length is 5 meters (16.4 feet).
• Cables must comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications.
• The cable’s SFF-8472 physical device identifier value must be 03h (SFP or SFP+). The value can be verified
with the cable manufacturer.
Note:
10GbE SFP+ direct-attach copper twinaxial cables are not forward-compatible with 25GbE SFP28 direct-
attach copper twinaxial cables. 10GbE SFP+ cables can be used with the dual rate 25GbE/10GbE ports in the FXT
5850, but the port speed will be limited to 10GbE. To obtain full 25GbE port speed, you must use 25GbE SFP28
direct-attach cables.
5.4. Cable Guidelines
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