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QSFP Pin Description

QSFP Pin Description

Connector Pin NumberPin NameSignal Description
1GNDGround
2Tx2nTransmitter Inverted Data Input
3Tx2pTransmitter Non-Inverted Data Input
4GNDGround
5Tx4nTransmitter Inverted Data Input
6Tx4pTransmitter Non-Inverted Data Input
7GNDGround
8Mod-SelLModule Select
9ResetLModule Reset
10Vcc Rx+3.3 V Power supply receiver
11SCL2-wire serial interface clock
12SDA2-wire serial interface data 
13GNDGround
14Rx3pReceiver Non-Inverted Data Output
15Rx3nReceiver Inverted Data Output
16GNDGround
17Rx1pReceiver Non-Inverted Data Output
18Rx1nReceiver Inverted Data Output
19GNDGround
20GNDGround
21Rx2nReceiver Inverted Data Output 3
22Rx2pReceiver Non-Inverted Data Output 3
23GNDGround
24Rx4nReceiver Inverted Data Output 3
25Rx4pReceiver Non-Inverted Data Output 3
26GNDGround
27ModPrsLModule Present
28IntLInterrupt
29Vcc Tx+3.3 V Power supply transmitter
30Vcc 1+3.3 V Power Supply
31LPModeLow Power Mode
32GNDGround
33Tx3pTransmitter Non-Inverted Data Input
34Tx3nTransmitter Inverted Data Input
35GNDGround
36Tx1pTransmitter Non-Inverted Data Input
37Tx1nTransmitter Inverted Data Input
38GNDGround

QSFP Connector Male and Female Views

RJ45 to DB9 Harness Pinout

In order to connect a host PC to the Console RJ45 port of the system, a RS232 harness cable (DB9 to RJ45) is supplied.

RJ45 to DB9 Harness Pinout

RJ-45 Console and I²C interfaces are integrated in the same connector. Due to that, connecting any cable other than the Mellanox supplied console cable may cause an I²C hang. 

Using uncertified cables may damage the I²C interface.  Refer to the Replacement Parts Ordering Numbers appendix for harness details.