Port Connector Interfaces

The connector side of the switch has 20 leaf modules and each leaf module has 40 QSFP28 ports. The ports on each leaf module are placed in two rows, 20 ports to a row. The ports are labeled as shown below. The bottom row ports are flipped from the top row.

Port Numbering

Top and Bottom Ports

QSFP Interface

InfiniBand QSFP Connector Pin-out

Connector Pin Number	Connector Pin Name	Signal Description
1	GND	Ground
2	Tx2n	Transmitter Inverted Data Input
3	Tx2p	Transmitter Non-Inverted Data Input
4	GND	Ground
5	Tx4n	Transmitter Inverted Data Input
6	Tx4p	Transmitter Non-Inverted Data Input
7	GND	Ground
8	ModSelL	Module Select
9	ResetL	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	Receiver Non-Inverted Data Output
15	Rx3n	Receiver Inverted Data Output
16	GND	Ground
17	Rx1p	Receiver Non-Inverted Data Output
18	Rx1n	Receiver Inverted Data Output
19	GND	Ground
20	GND	Ground
21	Rx2n	Receiver Inverted Data Output 3
22	Rx2p	Receiver Non-Inverted Data Output 3
23	GND	Ground
24	Rx4n	Receiver Inverted Data Output 3
25	Rx4p	Receiver Non-Inverted Data Output 3
26	GND	Ground
27	ModPrsL	Module 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	Transmitter Non-Inverted Data Input
34	Tx3n	Transmitter Inverted Data Input
35	GND	Ground
36	Tx1p	Transmitter Non-Inverted Data Input
37	Tx1n	Transmitter Inverted Data Input
38	GND	Ground

InfiniBand QSFP Connector Symbol

QSFP Connector Male and Female Views

QSFP Cable Power Budget Classification

This switch systems is designed for active cable usage with a max power of 4.9W per module. This is power level 6 according to the QSFP Public Specification.

Air Flow

Approximately 10% of switch power is dissipated through the air. Switch comes with the air flow pattern of air entering through the spine side and exiting through the connector side. There are few fans within the system to manage air cooling:

Each PSU is having its own built in fan, this fan is under PSU control and monitoring. Its speed and health are monitored but can’t be altered.
MNG FRU is having 3 fans (2+1 redundant) at its front panel to take care of its own cooling.
MNG FRU is also having 2 additional fans (1 + 1 redundant) for chassis air cooling. Those fans are providing minimum airflow within the chassis to avoid air stagnation and system thermal runaway.

Warning

If there are plans to use system with not all FRUs installed (MNG, Spine or Leaf) the user must install the relevant blank unit into the unused slot/s

Liquid Cooling System Connectors

90% of the switch system's power is dissipated through a water cooling device. The switch's inner water loop is sourced by either the CDU or the AHX (depending on user’s facilities). There is a ball valve connector on incoming and outcoming hoses between the CDU and the switch to allow a leak-free connection and disconnection between the units. Also, Leaf and Spine FRUs are equipped with dripless quick-connect connectors to allow hot swapping operation. Connecting and disconnecting FRUs can be done under water pressure, there will be no leak from either the manifold nor the FRU.