Setting The Interface Options; Fibre Channel (Fc) Loop And Id Settings; Tray Number Settings - IBM EXP15 Hardware Maintenance Manual

Setting the interface options:

There are two rotary
tray number switches on each ESM board located on the
back of the expansion unit. It is easier to set these
switches before you install the expansion unit in a rack.
The switch on the left of the ESM board is for the
extended ID, which is the tens position (x10). The switch
on the right is for the base ID, which is the ones position
(x1). The tray number switches have 10 settings. Use
these settings (0–9) to identify the ID of the expansion unit.

Fibre Channel (FC) loop and ID settings:

When
you install a drive CRU in the expansion unit, the drive tray
plugs into a printed circuit board called the midplane. The
midplane sets the fibre channel loop ID automatically,
based on the setting of the tray number switch and the
physical location (bay) of the drive CRU.

Tray number settings:

Each ESM board has two tray
number switches. These rotary switches (values 0–9) set
various addresses and IDs. The base ID switch (x1) is for
the ones position and the extended ID switch (x10) is for
the tens position. The settings of the two switches, when
used together, provide a two-digit ID of the expansion unit.
The system management software uses this ID to provide
correlation between the system management graphics and
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IBM Netfinity EXP15, EXP200, EXP500 HMM