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Chapter 4: Motherboard Connections
SFP28 Ports (JSFP0/JSFP1)
The motherboard supports two small form-factor pluggable (SFP28) optical transceiver ports
(JSFP0/JSFP1). These SFP28 ports provide up to 25GbE Ethernet network connections.
SFP28 Port
Pin Definitions
Pin#
Definition
Pin#
Definition
1
Ground
11
Ground
2
TX_Fault
12
SFP+_RX_P
3
TX_Disable
13
SFP+_RX_N
4
I2C_SDA
14
Ground
5
I2C_SCL
15
+3.3V_RX
6
MOD_DEF
16
+3.3V_TX
7
RS0
17
Ground
8
NC
18
SFP+_TX_P
9
RS1
19
SFP+_TX_N
10
Ground
20
Ground
Unit Identifier Switch/ UID LED Indicator
A rear Unit Identifier (UID) switch (JUIDB1) and a rear UID LED indicator (LE1) are located on
the rear side of the motherboard. The front UID LED is located on pin 7 of the Front Control
Panel header (JF1). When you press the UID switch, both front and rear UID LED indicators
will turn on. Press the UID switch again to turn off the LEDs. The UID indicators provide 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 Switch
Pin Definitions
Pin#
Definition
1
Ground
2
Ground
3
Button In
4
Button In
UID LED Indicator
LED Color
Definition
Blue: On
Unit Identified
