https://en.wikipedia.org/wiki/10G-EPON donne 2 notions:
Forward error correction
The 10G-EPON employs a stream-based forward error correction (FEC) mechanism based on Reed-Solomon(255, 223). The FEC is mandatory for all channels operating at 10 Gbit/s rate, i.e., both downstream and upstream channels in symmetric 10 Gbit/s EPON and the downstream channel in the 10/1 Gbit/s asymmetric EPON. Upstream channel in the asymmetric EPON is the same as in 1 Gbit/s EPON, an optional frame-based FEC using Reed-Solomon(255, 239).
Usable bandwidth
10G-EPON uses 64B/66B line coding, thus encoding overhead is just 3.125% compared to 25% encoding overhead that 1G-EPON has due to its use of 8b/10b encoding. The usable bandwidth in 10G-EPON is 10 Gbit/s out of a raw bandwidth of 10.3125 Gbit/s.
Backward compatibility
le line coding est une implementation supérieure au FEC.... ce line coding est une FEC des signaux lumineux ?!