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Chapter 4: Motherboard Connections
Universal Serial Bus (USB) Ports
There are four USB 3.0 ports (USB0/1/2/3) on the I/O back panel. There is one USB 3.0
header (USB4/5) on the motherboard to provide front access USB connection.
Front Panel USB 4/5 (3.0/2.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
11
In
2
IntA_P1_SSRX-
12
IntA_P2_D-
3
IntA_
13
GND
4
GND
14
IntA_
5
IntA_P1_SSTX-
15
IntA_P2_SSTX-
6
IntA_
16
GND
7
GND
17
IntA_
8
IntA_P1_D-
18
IntA_P2_SSRX-
9
In
19
VBus
10
ID
Back Panel USB 2/3 (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
Ethernet Ports
Two LAN ports (LAN1/LAN2) and a dedicated IPMI LAN are located on the I/O back panel.
These LAN ports are supported by the onboard AST 2500 BMC and accepts an RJ45 type
cable. Refer to the LED Indicator Section for LAN LED information.
LAN Ports
Pin Definition
Pin#
Definition
Pin#
Definition
1
10
sgnd
2
TD0+
11
Act LED
3
TD0-
12
P3V3SB
4
TD1+
13
Link 100 LED
(Yellow, +3V3SB)
5
TD1-
14
Link 1000 LED
(Yellow, +3V3SB)
6
TD2+
15
Ground
7
TD2-
16
Ground
8
TD3+
17
Ground
9
TD3-
18
Ground