Because core sizes are different, OM1 cables can only be connected to other OM1 cables. For best
results, OM2 cables should not be connected to OM3 cables. However, if an OM2 cable is
connected to an OM3 cable, the characteristics of the OM2 cable apply to the entire length of the
cables. The following table shows the supported distances for the different fiber optic cable types
at different link speeds.
Table 11. Supported distances for multimode fiber optic cables
Header Cable Type and Distance
Rate OM1 OM2 OM3
2.125 Gbps 0.5 meters to 150 meters
(1.64 feet to 492.12 feet)
0.5 meters to 300 meters
(1.64 feet to 984.25 feet)
0.5 meters to 500 meters
(1.64 feet to 1640.41 feet)
4.25 Gbps 0.5 meters to 70 meters
(1.64 feet to 229.65 feet)
0.5 meters to 150 meters
(1.64 feet to 492.12 feet)
0.5 meters to 380 meters
(1.64 feet to 1246.71 feet)
8.5 Gbps 0.5 meters to 21 meters
(1.64 feet to 68.89 feet)
0.5 meters to 50 meters
(1.64 feet to 164.04 feet)
0.5 meters to 150 meters
(1.64 feet to 492.12 feet)
Adapter LED
Green and yellow LEDs can be seen through openings in the mounting bracket of the adapter. Green
indicates firmware operation and yellow signifies port activity. Table 12 summarizes the link rate
conditions. There is a 1-second pause when the LED is off between each group of fast flashes (2, 3, or 4).
Observe the LED sequence for several seconds to be sure that you have correctly identified the state.
Table 12. Normal LED states
Green LED Yellow LED State
Slow flash Off Normal, link inactive or not started
On 2 fast flashes 2 Gbps link rate - normal, link active
On 3 fast flashes 4 Gbps link rate - normal, link active
On 4 fast flashes 8 Gbps link rate - normal, link active
Power-on self test (POST) conditions and results are summarized in Table 13. These states can be used to
identify abnormal states or problems. Follow the action to be taken for each condition.
Table 13. POST conditions and results
Green LED Yellow LED State Action to be taken
Off Off Wake-up failure (dead board) Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Off On POST failure (dead board) Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Off Slow flash Wake-up failure monitor Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Off Fast flash POST failure Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Off Flashing POST processing in progress None
On Off Failure while adapter
functioning
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
On On Failure while adapter
functioning
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Slow flash Slow flash Offline for download None
22 Managing PCIe adapters
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