System-management software, such as IBM Netfinity Manager™, uses the ID when it
provides data and alerts for the expansion unit.
For more information on option switch settings, see "Setting the interface options and
ID settings" on page 10.
The following illustration shows the location of the switch card on the expansion unit.
Switch card
External option switches
Unit ID switch
Front controls, indicators, and devices
The primary controls on the front of the expansion unit are shown in the following
illustration.
General-system-
Bridge
error LED (amber)
card bay
Filler panel
Power-on LED (green)
Drive CRU
Activity
Drive bays
Fault
Tray
LED (green)
LED (amber)
handle
Latch
Power-on LED (green)
This green light indicates that the unit has good dc power.
14
IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual
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