Supermicro SYS-521C-NR User Manual page 59

Power Fail
The Power Fail LED connection is located at pins 5 and 6. Refer to the table below for pin
definitions.
Information LED (OH/Fan Fail/PWR Fail/UID LED)
The Information LED (OH/Fan Fail/PWR Fail/UID LED) connection is located on pins 7 and
8 of JF1. The LED on pin 7 is active when the UID switch on the rear I/O panel is pressed.
The LED on pin 8 provides warnings of overheat, power failure, or fan failure. Refer to the
table below for more information.
Status
Solid Red
Blinking Red (1Hz)
Blinking Red (0.25Hz)
Solid Blue
Blinking Blue (300msec)
NIC1/NIC2 (LAN1/LAN2)
The Network Interface Controller (NIC) LED connection for LAN port 1 is located on pins
11 and 12 of JF1, and LAN port 2 is on pins 9 and 10. Attach the NIC LED cables here to
display network activity. Refer to the table below for pin definitions.
Power Fail LED
Pin Definitions (JF1)
Pin# Definition
5 3.3V
6 Power Fail LED
Information LED-UID/OH/PWR Fail/Fan Fail LED
Pin Definitions (JF1)
Description
An overheat condition has occured. This may be caused by cable congestion.
Fan failure: check for an inoperative fan.
Power failure: check for a non-operational power supply.
Local UID is activated. Use this function to locate a unit in a rack mount
environment that might be need of service.
Remote UID is on. Use this function to identify a unit from a remote location
that might be in need of service.
NIC1/NIC2 LED
Pin Definitions (JF1)
Pin# Definition
9 NIC 2 Activity LED
11 NIC 1 Activity LED
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Chapter 4: Motherboard Connections