The 40G/50G IP core has support for any one of three FEC modes of operation as defined in Schedule 3 of the 25G Consortium:
- No FEC
- Clause 74 FEC (shortened cyclic code (2112, 2080))
- Clause 91 FEC (Reed-Solomon (528,514))
The FEC mode is communicated to the link partner during the auto-negotiation phase.