IBM 74Y4064 Handbook

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 Cable type and distance
Rate OM1 OM2 OM3 OM4
4 Gbps 0.5 - 70 m (1.64 -
229.65 ft)
0.5 - 150 m (1.64 -
492.12 ft)
0.5 - 380 m (1.64 -
1246.71 ft)
0.5 - 400 m (1.64 -
1312.34 ft)
8 Gbps 0.5 - 21 m (1.64 -
68.89 ft)
0.5 - 50 m (1.64 -
164.04 ft)
0.5 - 150 m (1.64 -
492.12 ft)
0.5 - 190 m (1.64 -
623.36 ft)
16 Gbps 0.5 - 15 m (1.64 -
49.21 ft)
0.5 - 35 m (1.64 -
114.82 ft)
0.5 - 100 m (1.64 -
328.08 ft)
0.5 - 125 m (1.64 -
410.10 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 Yellow LED State
On 2 fast flashes 4 Gbps link rate: normal, link active
On 3 fast flashes 8 Gbps link rate: normal, link active
On 4 fast flashes 16 Gbps link rate: normal, link active
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 Yellow LED State
Off Off Wake-up failure of the adapter board
Off On POST failure of the adapter board
Off Slow flash Wake-up failure monitor
Off Fast flash Failure in post
Off Flashing Postprocessing in progress
On Off Failure while functioning
On On Failure while functioning
Slow flash Off Normal, link down
Slow flash On Not defined
Slow flash Slow flash Offline for download
Slow flash Fast flash Restricted offline mode, waiting for
restart
Slow flash Flashing Restricted offline mode, test active
148 Managing PCIe adapters

IBM 74Y4064 Specifications

General

Brand	IBM
Model	74Y4064
Category	Adapter
Language	English