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Chapter 4: Motherboard Connections
Unit Identifier Button/UID LED Indicator
A Unit Identifier (UID) button and an LED indicator are located on the motherboard. The UID
button is located next to the VGA port on the back panel. The UID LED is located at LED2,
next to the UID button. When you press the UID button, the UID LED will be turned on.
Press the UID button again to turn off the LED indicator. The LED indicator provides easy
identification of a system unit that may be in need of service.
Note:
UID can also be triggered via IPMI on the motherboard. For more information on IPMI,
please refer to the IPMI User's Guide posted on our website at
UID Button
Pin Definitions
Pin#
Definition
1
Ground
2
Ground
3
Button In
4
Button In
UID LED
Pin Definitions
Color
Status
Blue: On
Unit Identified
Universal Serial Bus (USB) Ports
There are two USB 3.0 ports (USB4/5) on the I/O back panel. The motherboard also has
two front access USB 2.0 headers (USB0/1, USB2/3). The onboard headers can be used to
provide front side USB access with a cable (not included).
Front Panel USB 0/1, 2/3 (2.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
+5V
2
+5V
3
USB_N
4
USB_N
5
USB_P
6
USB_P
7
Ground
8
Ground
9
Key
10
NC
Back Panel USB 4/5 (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
A1
VBUS
B1
Power
A2
D-
B2
USB_N
A3
D+
B3
USB_P
A4
GND
B4
GND
A5
Stda_SSRX-
B5
USB3_RN
A6
St
B6
USB3_RP
A7
GND
B7
GND
A8
Stda_SSTX-
B8
USB3_TN
A9
St
B9
USB3_TP
