IBM 74Y4064 Handbook page 158

placement rules and slot priorities (http://www.ibm.com/support/knowledgecenter/POWER9/
p9eab/p9eab_mtm_pciplacement.htm) and select the system that you are working on.
Voltage
3.3 V, 12 V
Form factor
Short, MD2
FC compatibility
4, 8, 16 Gb
Cables
Cables are the responsibility of the customer. Use multimode fiber optic cables with shortwave
lasers that adhere to the following specifications:
v OM4: Multimode 50/125 micron fiber, 4700 MHz x km bandwidth
v OM3: Multimode 50/125 micron fiber, 2000 MHz x km bandwidth
v OM2: Multimode 50/125 micron fiber, 500 MHz x km bandwidth
v OM1: Multimode 62.5/125 micron fiber, 200 MHz x km bandwidth
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 42. Supported distances for cables
Header
Rate OM1
4.25 Gbps 0.5 - 70 m (1.64 -
229.65 ft)
8.5 Gbps 0.5 - 21 m (1.64 -
68.89 ft)
14.025 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 43 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 43. Normal LED states
Green LED
On
On
On
Power-on-self-test (POST) conditions and results are summarized in Table 44. These states can be used to
identify abnormal states or problems.
Table 44. POST conditions and results
Green LED
Off
142
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
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