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Chapter 4: Motherboard Connections
4.4 LED Indicators
IPMI LAN Port LEDs
The IPMI Ethernet port has two LED indicators. The Activity LED is yellow and indicates
connection and activity. The Link LED may be green, amber, or off to indicate the speed of
the connection. Refer to the tables below for more information.
BMC Heartbeat LED
The BMC Heartbeat LED is a green LED located at BMC LED1 on the motherboard. When
BMC LED1 is blinking, the BMC is functioning normally. See the table below for more
information.
BMC Heartbeat
LED State
State
Definition
Solid On
BMC is not ready
Blinking
BMC Normal
Fast Blinking
BMC: Initializing
UID Switch and LED Indicator
The rear UID LED2 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).
UID LED
LED Indicator
Color
State
Definition
Blue
Solid On
Unit Identified
None
Off
UID Off
Link LED
Connection Link Speed Indicator
LED Color
Definition
Off
10 Mb/s
Green
100 Mb/s
Amber
1 Gb/s
Activity LED
Color
State
Definition
Off
No Connection
Yellow
Solid On
Link
Yellow
Flashing
Active
Activity LED
Link LED
