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Chapter 4: Motherboard Connections
Universal Serial Bus (USB) Ports and Headers
Two USB 3.0 ports (USB0/1) are located on the rear I/O panel, and an internal Type A USB
3.0 header (USB2) is located on the motherboard to provide front access.
Rear I/O Panel USB 0/1 (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
Type A USB 2 (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
5
SSRX-
2
USB_N
6
SSRX+
3
USB_P
7
GND
4
Ground
8
SSTX-
9
SSTX+
UID LED
Pin Definitions
Color
Status
Blue: On
Unit Identified
Unit Identifier Switch and UID LED Indicator
A Unit Identifier (UID) switch and a rear UID LED (LED1) are located on the rear I/O panel.
The front UID LED is located on pins 7 & 8 of the front panel control header (JF1). When
you press the rear UID switch, both front and rear UID LEDs will be turned on. Press the UID
switch again to turn off the LED indicators. The UID indicators provide easy identification of
a system in a rack environment.
Note:
UID can also be triggered via BMC on the motherboard.