Pin Description

The SFP28 pin assignment is SFF-8419 compliant.

SFP28 Function Definition

Pin	Connector Pin Name	Port A Signal Name
1	VeeT	Module Transmitter Ground
2	Tx_Fault	Module Transmitter Fault
3	Tx_Disable	Transmitter Disable. Turns off transmitter laser output
4	SDA	2-wire Serial Interface Data Line
5	SCL	2-wire Serial Interface Clock
6	Mod_ABS	Module Absent. Grounded within the module
7	RS0	Rate Select 0, optionally controls SFP+ module receiver
8	Rx_LOS	Receiver Loss of Signal Indication
9	RS1	Rate Select 1, optionally controls SFP+ module transmitter
10	VeeR	Module Receiver Ground
11	VeeR	Module Receiver Ground
12	RD-	Receiver Inverted Data Output
13	RD+	Receiver Non-Inverted Data Output
14	VeeR	Module Receiver Ground
15	VccR	Module Receiver Power Supply
16	VccT	Module Transmitter Power Supply
17	VeeT	Module Transmitter Ground
18	TD+	Transmitter Non-Inverted Data Input. AC coupled
19	TD-	Transmitter Inverted Data Input. AC coupled
20	VeeT	Module Transmitter Ground

The transceiver’s management functions comply with SFF-8472.

Physical layer link tuning
- Tx input equalization programmable in 11 levels up to 10 dB
- Rx output pre-emphasis programmable in 8 levels up to 7 dB
- Tx/Rx CDR control, refer to ‎Appendix
DDM – Readout and Warning/Alarm Indication
- Rx receive optical power monitor
- Tx transmit optical power monitor
- Tx bias current monitor
- Module supply voltage monitor
- Module case temperature monitor
MSA supported features and interrupt indications
- Tx & Rx LOS
- Tx & Rx LoL
- Tx fault
- Tx & Rx disable