In general, EOS always configures the PHYs to have the correct polarity to match that of the standard, such that if a standard compliant transceiver is plugged in and the peer is standard compliant everything will work.

This document describes the configuration and behavior of physical interfaces on the DCS-7060X6-series switches including: Speed, Forward Error Correction (FEC), FEC histograms, Logical ports, Precoding, Transceiver Online Insertion and Removal (OIR).

Precoding is used to help reduce the burst error length of DFE (Decision Feedback Equalizer) error events with PAM-4 modulation