Summary

Recommendation ITU-T G.709.6 specifies 400G and 800G FlexO Beyond 400G (B400G) long-reach interfaces. The Recommendation specifies the structure using forward error correction (FEC) codes with a higher coding gain suitable for longer reach applications, and references common elements from Recommendation ITU-T G.709.1 and FEC structures from Recommendation ITU-T G.709.3.