The Inverse RS-FEC sublayer specifies a Reed-Solomon forward error correction (RS-FEC) sublayer for 100GBASE-R, 100GBASE-P, and 100GBASE-Z PHYs. This sublayer is used in cases where the RS-FEC specified in Clause 91 is used across a physically instantiated 100GAUI-n and a different FEC is used for the PMD.
IEEE 802.3ct-2021
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IEEE Standard for Ethernet Amendment 13: Physical Layers and Management Parameters for 100 Gb/s Operation over DWDM Systems