IBM 74Y4064 Handbook page 164

Because core sizes are different, OM1 cables can only be connected to other OM1 cables. For best
results, OM2 cables must 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 cable types at the different
link speeds.
Table 45. 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 46 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 46. Normal LED states
Green LED
On
On
On
Power-on-self-test (POST) conditions and results are summarized in Table 47. These states can be used to
identify abnormal states or problems.
Table 47. POST conditions and results
Green LED
Off
Off
Off
Off
Off
On
On
Slow flash
Slow flash
Slow flash
Slow flash
Slow flash
148
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
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