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Chapter 4: Motherboard Connections
Universal Serial Bus (USB) Ports
Four USB 3.0 ports (USB1/2, 3/4) are located on the I/O back panel. A Type A internal USB
2.0 header provides front access. Connect appropriate cables here to use USB support. (USB
cables are not included).
Back Panel USB (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
10
Power
2
D-
11
USB 2.0 Differential Pair
3
D+
12
4
Ground
13
Ground of PWR Return
5
StdA_SSRX-
14
SuperSpeed Receiver
6
St 15
Differential Pair
7
GND_DRAIN
16
Ground for Signal Return
8
StdA_SSTX-
17
SuperSpeed Transmitter
9
St
18
Differential Pair
USB (2.0)
Pin Definitions
Pin#
Definition
1
Vcc
2
Data-
3
Data+
4
Ground
Unit Identifier Switch/UID LED Indicator
A Unit Identifier (UID) switch and a rear UID LED (LE1) are located on the I/O back panel.
A front UID switch is located on pins 7 & 8 of the front panel control (JF1). When you press
the front or 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 that may be in need of service. (
Note:
UID can also be triggered via IPMI on
the motherboard. For more information, please refer to the IPMI User's Guide posted on our
website at
.)
UID Switch
Pin Definitions
Pin#
Definition
1
Ground
2
Ground
3
Button In
4
Button In
UID LED
Pin Definitions
Color
Status
Blue: On
Unit Identified
