IBM 3531 manual Front controls, indicators, and devices, Power-on LED green

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

0

8

7

65

1

2 3

External option switches

5 4 3 2 1

2 1

0

9 8

3 4

5 6 7

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
Power-on LED (green) error LED (amber)		card bay Filler panel

Drive CRU

Activity	Fault	Tray	Drive bays
LED (green)	LED (amber)	handle	Latch

Power-on LED (green)

This green light indicates that the unit has good dc power.

14IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual