IBM 74Y4064 Handbook page 38

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
Rate
2.125 Gbps
4.25 Gbps
8.5 Gbps
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
Slow flash
On
On
On
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
Off Off
Off On
Off Slow flash
Off Fast flash
Off Flashing
On Off
On On
Slow flash Slow flash
22
Managing PCIe adapters
OM1
0.5 meters to 150 meters
(1.64 feet to 492.12 feet)
0.5 meters to 70 meters
(1.64 feet to 229.65 feet)
0.5 meters to 21 meters
(1.64 feet to 68.89 feet)
Yellow LED
Off
2 fast flashes
3 fast flashes
4 fast flashes
State
Wake-up failure (dead board)
POST failure (dead board)
Wake-up failure monitor
POST failure
POST processing in progress
Failure while adapter
functioning
Failure while adapter
functioning
Offline for download
Cable Type and Distance
OM2
0.5 meters to 300 meters
(1.64 feet to 984.25 feet)
0.5 meters to 150 meters
(1.64 feet to 492.12 feet)
0.5 meters to 50 meters
(1.64 feet to 164.04 feet)
State
Normal, link inactive or not started
2 Gbps link rate - normal, link active
4 Gbps link rate - normal, link active
8 Gbps link rate - normal, link active
Action to be taken
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
None
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
Perform AIX, IBM i, or Linux operating system
diagnostics procedure.
None
OM3
0.5 meters to 500 meters
(1.64 feet to 1640.41 feet)
0.5 meters to 380 meters
(1.64 feet to 1246.71 feet)
0.5 meters to 150 meters
(1.64 feet to 492.12 feet)