NEC Express5800 series User Manual page 45

Identification of Servers ~ UID Switch ~
An "UID (Unit ID) lamp" is provided on the front panel and rear panel. If more than one server
is mounted in a single rack, the lamp identifies the server you are going to maintain.
The UID lamp goes on when the UID (Unit ID) switch on the front panel is pressed. It goes off
when the switch is pressed again.
Maintenance from the rear of the rack has to be carried out in a dark, narrow space. The
interface cable of a server or power supply unit in normal state may be disconnected by
accident in this situation. To prevent this problem, you should start maintenance after
confirming the target server by using the UID switch.
UID lamp
UID switch
UID lamp (Visible through the clearance between
the frame and the lamp on the motherboard)
System Overview 35