Supermicro H12SSL Series User Manual page 47

UID Switch and LED Indicator (UID LED & UID-SW)
The rear UID LED is located next to the UID switch. The front UID LED is located on the front
panel. When you press the UID switch, both rear and front UID LED indicators will turn on.
Press the UID switch again to turn off the LED indicators. Use this UID Indicator to 'mark' the
system, so the system can be easily identified whether on the front or back (e.g., a system
rack with multiple units installed).
BMC Hearbeat LED (LEDM1)
A BMC Heartbeat LED is located at LEDM1 on the motherboard. When LEDM1 is blinking,
the BMC is functioning normally. See the table below for more information.
Onboard Power OK LED (LE1)
LE1 is an onboard power OK LED. When this LED is lit, it means the system is turned on,
and all the system power rails are ready. When the system is turned off, or any one of the
system power rails fails, this LED will turn off. Turn off the system, and unplug the power
cord before removing or installing any component(s).
UID LED
LED Indicator
Color State
Blue Solid On
None Off
BMC Heartbeat
LED State
Color State
Green Solid On
Green Blinking
Green Fast Blinking
Onboard Power
LED Indicator
LED Color Definition
Off System Off (power cable not connected)
Green System On, Power OK
47
Chapter 2: Installation
Definition
Unit Identified
UID Off
Definition
BMC is not ready
BMC Normal
BMC: Initializing