Fujitsu SPARC ENTERPRISE M9000 Service Manual page 211

IOU Mounting Locations (Rear of M9000 with the Expansion Cabinet)
FIGURE 7-5
IOU#15
IOU#13
IOU#11
IOU#9
IOU#7
IOU#5
IOU#3
IOU#1
lists the abbreviated names and component numbers of the IOUs.
TABLE 7-1
Abbreviated Names and Component Numbers of IOUs
TABLE 7-1
Model name
M8000
M9000 base cabinet
M9000 expansion cabinet
Abbreviated names and numbers
IOU#0 to 3
IOU#0, 2, 4, and 6 (front)
IOU#1, 3, 5, and 7 (rear)
IOU#8, 10, 12, and 14 (front)
IOU#9, 11, 13, and 15 (rear)
Chapter 7 I/O Unit (IOU) Replacement 7-7