SFP28 delivers 25 Gbps per lane in the SFP+ form factor. Four SFP28 ports aggregate to 100GbE for server-to-switch connections.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | VEET | TX ground | GND |
| 2 | TFAULT | TX fault | I/O |
| 3 | TDIS | TX disable | I/O |
| 4 | MOD_DEF2 | I2C SDA | BUS |
| 5 | MOD_DEF1 | I2C SCL | BUS |
| 6 | MOD_DEF0 | Module present | I/O |
| 8 | LOS | Loss of signal | I/O |
| 12 | RD- | RX data negative | BUS |
| 13 | RD+ | RX data positive | BUS |
| 15 | VCCR | RX power 3.3V | PWR |
| 16 | VCCT | TX power 3.3V | PWR |
| 18 | TD+ | TX data positive | BUS |
| 19 | TD- | TX data negative | BUS |