Table 31: Qsfp Pin Description 1-20 - Mellanox Technologies Spectrum SN2740 Hardware User Manual

Appendix C: Interface Specifications
C.1 QSFP28 Pin Description
Table 31 - QSFP Pin Description 1-20
Connector
Pin Symbol
Number
1 GND
2
3
4 GND
5
6
7 GND
Mod-
8
9 ResetL
10 Vcc Rx
11
12
13 GND
Rx3p
14
Rx3n
15
16 GND
Rx1p
17
Rx1n
18
19 GND
20 GND
Rev 2.2
Signal Description
Ground
Tx2n Connected to Port 2 lane Rx
Inverted Data
Tx2p Connected to Port 2 lane Rx
Non-Inverted Data
Ground
Tx4n Connected to Port 4 lane Rx
Inverted Data
Tx4p Connected to Port 4 lane Rx
Non-Inverted Data
Ground
Cable/Module Select
SelL
Cable/Module Reset
+3.3 V Power supply receiver
SCL 2-wire serial interface clock
SDA 2-wire serial interface data
Ground
Connected to Port 3 lane Tx
Non-Inverted Data
Connected to Port 3 lane Tx
Inverted Data
Ground
Connected to Port 1 lane Tx
Non-Inverted Data
Connected to Port 1 lane Tx
Inverted Data
Ground
Ground
Mellanox Technologies
J3 and J6
J3 and J6
20
20
GND
GND
21
21
Rx2n
Rx2n
22
22
Rx2p
Rx2p
23
23
GND
GND
24
24
Rx4n
Rx4n
25
25
Rx4p
Rx4p
26
26
GND
GND
27
27
ModPrsL
ModPrsL
28
28
IntL
IntL
29
29
VccTx Vcc Rx
VccTx Vcc Rx
30
30
Vcc1 ResetL
Vcc1 ResetL
31
31
LPMode ModSelL
LPMode ModSelL
32
32
GND
GND
33
33
Tx3p
Tx3p
34
34
Tx3n
Tx3n
35
35
GND
GND
36
36
Tx1p
Tx1p
37
37
Tx1n
Tx1n
38
38 GND
GND
19
19
GND
GND
18
18
Rx1n
Rx1n
17
17
Rx1p
Rx1p
16
16
GND
GND
15
15
Rx3n
Rx3n
14
14
Rx3p
Rx3p
13
13
GND
GND
12
12
SDA
SDA
11
11
SCL
SCL
10
10
9
9
8
8
7
7
GND
GND
6
6
Tx4p
Tx4p
5
5
Tx4n
Tx4n
4
4
GND
GND
3
3
Tx2p
Tx2p
2
2
Tx2n
Tx2n
1
1
GND
GND
92