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 |
SFP28 Module Pad Layout
Digital Diagnostic Monitoring Features
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