Connector Pinouts
QSFP28 Connectors
Pin Description
Pin Description
1
GND
(Module ground)
20 GND
(Module ground)
2
TX2-
(Transmitter inverted data input)
21 RX2-
(Receiver inverted data output)
3
TX2+
(Transmitter noninverted data input)
22 RX2+
(Receiver noninverted data output)
4
GND
(Module ground)
23 GND
(Module ground)
5
TX4-
(Transmitter inverted data input)
24 RX4-
(Receiver inverted data output)
6
TX4+
(Transmitter noninverted data input)
25 RX4+
(Receiver noninverted data output)
7
GND
(Module ground)
26 GND
(Module ground)
8
MODSEIL
(Module select)
27 ModPrsL
(Module Present, internal pulled
down to GND)
9
ResetL
(Module reset)
28 IntL
(Interrupt output, should be pulled up
on host board)
10
VCCRx
(+3.3V receiver power supply)
29 VCCTx
(+3.3V transmitter power supply)
11
SCL
(2-wire serial interface clock)
30 VCC1
(+3.3V power supply)
12
SDA
(2-wire serial interface data)
31 LPMode
(Low power mode)
13
GND
(Module ground)
32 GND
(Module ground)
14
RX3+
(Receiver noninverted data output)
33 TX3+
(Transmitter noninverted data input)
15
RX3-
(Receiver inverted data output)
34 TX3-
(Transmitter inverted data input)
16
GND
(Module ground)
35 GND
(Module ground)
17
RX1+
(Receiver noninverted data output)
36 TX1+
(Transmitter noninverted data input)
18
RX1-
(Receiver inverted data output)
37 TX1-
(Transmitter inverted data input)
19
GND
(Module ground)
38 GND
(Module ground)
LAN LED
Description
LAN LED
Description
Speed
(Left)
Green: 100Gbps data rate
Orange: other data rate
Link
(Right)
Yellow: Active
