IBM 440 - Manual (Page 147)

Chapter 5. Management 133
First Slot Label, Last Slot Label: The first and last slot labels in the server are
identified. When the RXE-100 is selected, the slot labels are A1 through A6
and B1 through B6. The labels correspond to the names of the slots as
printed on the chassis.
I/O Drawer: This value is only relevant when an RXE-100 is selected. The
number is unique and the first drawer will be number 0.
Unit Name, Unit Type: The unit name is IBM eServer xSeries 440 and the unit
type is Chassis. When you select the RXE-100, the unit name is IBM
RXE-100 and the unit type is I/O Drawer.
Selecting a slot results in the details of that slot appearing in the bottom right
pane, as shown in Figure 5-4.
Figure 5-4 Slot 3 details