Interface Specifications

NVIDIA Spectrum SN2000 1U Switch Systems Hardware User Manual

image2018-11-14_14-24-7-version-1-modificationdate-1542658570887-api-v2.png

QSFP Pin Description

Connector Pin Number

Symbol

Signal Description

1

GND

Ground

2

Tx2n

Connected to Port 2 lane Rx

Inverted Data

3

Tx2p

Connected to Port 2 lane Rx

Non-Inverted Data

4

GND

Ground

5

Tx4n

Connected to Port 4 lane Rx

Inverted Data

6

Tx4p

Connected to Port 4 lane Rx

Non-Inverted Data

7

GND

Ground

8

Mod-SelL

Cable/Module Select

9

ResetL

Cable/Module Reset

10

Vcc Rx

+3.3 V Power supply receiver

11

SCL

2-wire serial interface clock

12

SDA

2-wire serial interface data

13

GND

Ground

14

Rx3p

Connected to Port 3 lane Tx

Non-Inverted Data

15

Rx3n

Connected to Port 3 lane Tx

Inverted Data

16

GND

Ground

17

Rx1p

Connected to Port 1 lane Tx

Non-Inverted Data

18

Rx1n

Connected to Port 1 lane Tx

Inverted Data

19

GND

Ground

20

GND

Ground

21

Rx2n

Connected to Port 2 lane Tx

Inverted Data

22

Rx2p

Connected to Port 2 lane Tx

Non-Inverted Data

23

GND

Ground

24

Rx4n

Connected to Port 4 lane Tx

Inverted Data

25

Rx4p

Connected to Port 4 lane Tx

Non-Inverted Data

26

GND

Ground

27

ModPrsL

Module/cable Present

28

IntL

Interrupt

29

Vcc Tx

+3.3 V Power supply transmitter

30

Vcc 1

+3.3 V Power Supply

31

LPMode

Low Power Mode

32

GND

Ground

33

Tx3p

Connected to Port 3 lane Rx

Non-Inverted Data

34

Tx3n

Connected to Port 3 lane Rx

Inverted Data

35

GND

Ground

36

Tx1p

Connected to Port 1 lane Rx

Non-Inverted Data

37

Tx1n

Connected to Port 1 lane Rx

Inverted Data

38

GND

Ground

image2018-11-14_14-37-8-version-1-modificationdate-1542658570997-api-v2.png

Rear View of Module with Pin Placement

image2018-11-14_14-37-29-version-1-modificationdate-1542658570947-api-v2.png

SFP Pin Description

Pin

Symbol Name

Description

Note

1

VeeT

Module Transmitter Ground

--

2

TX_Fault

Module Transmitter Fault

a

3

TX_Disable

Transmitter Disable. Turns off transmitter laser output

b

4

SDA

2-wire Serial Interface Data Line

c

5

SCL

2-wire Serial Interface Clock Line

d

6

MOD_ABS

Module Absent. Grounded within the module

d

7

RS0

No connection required

--

8

Rx_LOS

Loss of Signal indication. Logic 0 indicates normal operation.

d

9

RS1

No connection required

--

10

VeeR

Receiver Ground (Common with Transmitter Ground)

a

11

VeeR

Receiver Ground (Common with Transmitter Ground)

a

12

RD-

Receiver Inverted DATA out. AC Coupled

--

13

RD+

Receiver Non-inverted DATA out. AC Coupled

--

14

VeeR

Receiver Ground (Common with Transmitter Ground)

a

15

VccR

Receiver Power Supply

--

16

VccT

Transmitter Power Supply

--

17

VeeT

Transmitter Ground (Common with Receiver Ground)

a

18

TD+

Transmitter Non-Inverted DATA in. AC Coupled

--

19

TD-

Transmitter Inverted DATA in. AC Coupled

--

20

VeeT

Transmitter Ground (Common with Receiver Ground)

a

Notes:

  1. TFAULT is an open collector/drain output, which should be pulled up with a 4.7k-10k Ohms resistor on the host board if intended for use. Pull up voltage should be between 2.0V to Vcc + 0.3V. A high output indicates a transmitter fault caused by either the TX bias current or the TX output power exceeding the preset alarm thresholds. A low output indicates normal operation. In the low state, the output is pulled to <0.8V.

  2. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V

  3. Should be pulled up with 4.7kΩ-10kΩ on host board to a voltage between 2.0V and 3.6V. MOD_ABS pulls line low to indicate module is plugged in.

  4. LOS is open collector output. Should be pulled up with 4.7kΩ-10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

Important

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.

Signal

Pin#

Color

Not connected

1

G/W

I²C_SCL

2

G

TXD

3

O/W

Not connected

4

Bl

GND

5

Bl/W

RXD

6

O

I²C_SDA

7

Br/W

Not connected

8

Br

The RS232 harness cable (DB9 to RJ45) is provided within the package to connect a host PC to the system's Console RJ45 port.

RJ45 to DB9 Harness Pinout

image2022-7-18_15-38-55-version-1-modificationdate-1658185835090-api-v2.png

2m RJ45-to-RJ45 serial port cable is provided in the SN2410 and SN2700 packages.

The harness must be used when connecting the switch serial port with the terminal server/console server.

Warning

The new harness can be extended by an ordinary flat 1-to-1 RJ45 cable.

RJ45toRJ45-version-1-modificationdate-1568036626200-api-v2.png

© Copyright 2024, NVIDIA. Last updated on Mar 26, 2024.