IBM 74Y4064 Handbook page 168

The following table shows the supported distances for the different cable types at the different
link speeds.
Table 48. Supported distances for cables
Header
Rate OM1
4 Gbps 0.5 - 70 m (1.64 -
229.65 ft)
8 Gbps 0.5 - 21 m (1.64 -
68.89 ft)
16 Gbps 0.5 - 15 m (1.64 -
49.21 ft)
Adapter LED states
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 49 summarizes normal LED states.
A 1 Hz pause occurs when the LED is off between each group of fast flashes (2, 3 or 4). Observe the LED
sequence for several seconds to ensure that you correctly identify the state.
Table 49. Normal LED states
Green LED
On
On
On
Power-on-self-test (POST) conditions and results are summarized in Table 50. These states can be used to
identify abnormal states or problems.
Table 50. POST conditions and results
Green LED
Off
Off
Off
Off
Off
On
On
Slow flash
Slow flash
Slow flash
Slow flash
Slow flash
Fast flash
Fast flash
Fast flash
152
Managing PCIe adapters
Cable type and distance
OM2
0.5 - 150 m (1.64 -
492.12 ft)
0.5 - 50 m (1.64 -
164.04 ft)
0.5 - 35 m (1.64 -
114.82 ft)
Yellow LED
2 fast flashes
3 fast flashes
4 fast flashes
Yellow LED
Off
On
Slow flash
Fast flash
Flashing
Off
On
Off
On
Slow flash
Fast flash
Flashing
Off
On
Slow flash
OM3 OM4
0.5 - 380 m (1.64 - 0.5 - 400 m (1.64 -
1246.71 ft) 1312.34 ft)
0.5 - 150 m (1.64 - 0.5 - 190 m (1.64 -
492.12 ft) 623.36 ft)
0.5 - 100 m (1.64 - 0.5 - 125 m (1.64 -
328.08 ft) 410.10 ft)
State
4 Gbps link rate: normal, link active
8 Gbps link rate: normal, link active
16 Gbps link rate: normal, link active
State
Wake-up failure of the adapter board
POST failure of the adapter board
Wake-up failure monitor
Failure in post
Postprocessing in progress
Failure while functioning
Failure while functioning
Normal, link down
Not defined
Offline for download
Restricted offline mode, waiting for
restart
Restricted offline mode, test active
Debug monitor in restricted mode
Not defined
Debug monitor in test fixture mode