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Chapter 4: Motherboard Connections
4.5 LED Indicators
LAN LEDs
The Ethernet ports each have two LEDs. One LED indicates activity when flashing, while the
other LED may be green, amber or off to indicate the speed of the connection.
LAN LED
(Connection Speed
Indicator)
LED Color
Definition
Off
10 Mb/s
Green
25 Gb/s
Amber
1 Gb/s
System Failure LED
LED3 indicates an overheated system, a power supply failure or fan failure.
System Overheat/Power Failure/Fan
Failure LED Indicator
LED Color
Definition
Solid Red
System Overheat
Blinking Red Power or Fan Failure
Off
Normal operation
Dedicated IPMI LAN LEDs
A dedicated IPMI LAN port is on the I/O back panel. The amber LED on the right of the IPMI
LAN port indicates activity, while the LED on the left indicates the link speed of the connection.
IPMI LAN Activity LED (Right)
LED
Color/State
Definition
Activity (Right)
Green: Blinking
100 Mbps
Activity (Right)
Amber: Blinking
1G
Unit ID LED
A rear unit identifier (UID) indicator at LE2 is located near the UID switch on the I/O back
panel. It provides easy identification of a unit in a rack.
BMC Heartbeat LED
BMC_HB_LED1 is the BMC heartbeat LED. When the LED is blinking green, BMC is
functioning normally.