Pin Descriptions

QSFP56 Pin Description for 200Gb/s End

The pin assignment is SFF-8679 compliant.

Pin	Symbol	Description	Pin	Symbol	Description
1	GND	Ground	20	GND	Ground
2	Tx2n	Connected to Port 1 lane Rx2 Inverted Data	21	Rx2n	Connected to Port 1 lane Tx2 Inverted Data
3	Tx2p	Connected to Port 1 lane Rx2 Non-Inverted Data	22	Rx2p	Connected to Port 1 lane Tx2 Non-Inverted Data
4	GND	Ground	23	GND	Grounds
5	Tx4n	Transmitter Inverted Data Input	24	Rx4n	Connected to Port 1 lane Tx2 Inverted Data
6	Tx4p	Transmitter Non-Inverted Data Input	25	Rx4p	Connected to Port 1 lane Tx2 Non-Inverted Data
7	GND	Ground	26	GND	Ground
8	ModSelL	Module Select	27	ModPrsL	Module Present
9	ResetL	Module Reset	28	IntL	Interrupt
10	Vcc Rx	+3.3V Power Supply Receiver	29	Vcc Tx	+3.3V Power Supply Transmitter
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	GND	32	GND	Ground
14	Rx3p	Receiver Non-Inverted Data Output	33	Tx3p	Connected to Port 1 lane Rx1 Non-Inverted Data
15	Rx3n	Receiver Inverted Data Output	34	Tx3n	Connected to Port 1 lane Rx1 Inverted Data
16	GND	Ground	35	GND	Ground
17	Rx1p	Connected to Port 1 lane Tx1 Non-Inverted Data	36	Tx1p	Connected to Port 1 lane Rx1 Non-Inverted Data
18	Rx1n	Connected to Port 1 lane Tx1 Inverted Data	37	Tx1n	Connected to Port 1 lane Rx1 Inverted Data
19	GND	Ground	38	GND	Ground

QSFP56 Module Pad Layout for 200Gb/s End

QSFP56 Pin Description for 100Gb/s End

Pin	Symbol	Description	Pin	Symbol	Description
1	GND	Ground	20	GND	Ground
2	Tx2n	Connected to lane Rx2 Inverted Data	21	Rx2n	Connected to lane Tx2 Inverted Data
3	Tx2p	Connected to lane Rx2 Non-Inverted Data	22	Rx2p	Connected to lane Tx2 Non-Inverted Data
4	GND	Ground	23	GND	Grounds
5	Tx4n	Not connected	24	Rx4n	Not connected
6	Tx4p	Not connected	25	Rx4p	Not connected
7	GND	Ground	26	GND	Ground
8	ModSelL	Module Select	27	ModPrsL	Module Present
9	ResetL	Module Reset	28	IntL	Interrupt
10	Vcc Rx	+3.3V Power Supply Receiver	29	Vcc Tx	+3.3V Power Supply Transmitter
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	GND	32	GND	Ground
14	Rx3p	Not connected	33	Tx3p	Not connected
15	Rx3n	Not connected	34	Tx3n	Not connected
16	GND	Ground	35	GND	Ground
17	Rx1p	Connected to lane Tx1 Non-Inverted Data	36	Tx1p	Connected to lane Rx1 Non-Inverted Data
18	Rx1n	Connected to lane Tx1 Inverted Data	37	Tx1n	Connected to lane Rx1 Inverted Data
19	GND	Ground	38	GND	Ground

QSFP56 Module Pad Layout for 100Gb/s End

The Pinout of the 100Gb/s ends of the cable is identical to the 200Gb/s end except that RF lanes 3 and 4 (pins 5, 6, 14, 15, 24, 25, 33, 34) are not connected.

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QSFP56 Pin Description for 200Gb/s End

QSFP56 Module Pad Layout for 200Gb/s End

QSFP56 Pin Description for 100Gb/s End

QSFP56 Module Pad Layout for 100Gb/s End