IEEE Std 802.3-2020 pdf free.IEEE Standard for Ethernet Amendment 7: Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber.
400GBASE.SR4.2 ability (1.24.7)
When read as a one, hit 1.24.7 indicates that the PMAPMD is able to operate as a 4OX1RASF.-SR4.2 PN’IAPMD type. When read as a zero, hit 1.24.7 indicates that the PMAP1D is not able to operate as a 4O(XJBASE-SR42 PMA’PMD type,
400GBASESR8 ability (1.24.6)
rhefl read as a one, hit 1.24.6 indicates that the PMAPMD is able to operate as a 4QOc.RASE-SR8 PMA/PMD type. When read as a zero, hit 1.24.6 indicates that the PMAPMD is no able to operate as a 4OOGBASF-SR PMA!PMD type.
Change the third, fourth, and fifth paragraphs of 138.1 as follows:
Figure 138-1 shows the relationship of the PMDs and MDIs (shown shaded) with other sublayers to the ISO/IEC Open System Interconnction (OSI) reference model. 50 Gigabit Ethernet is introduced in Clause 131 and the purpose of each PHY sublayer is summarized in 131.2. 100 Gigabit Ethernet is introduced in Clause 80 and the purpose of each PHY sublayer is summarized in 80.2. 200 Gigabit Ethernet and 400 Gigabit Ethernet areis introduced in Clause 116 and the purpose of each PHY sublayer is summarized in 116.2.
50GBASE-SR，100GBASE-SR2, and -200GBASE-SR4, and 400GBASE-SR8 PHYs with the optional Energy-Efficient Ethernet (EEE) fast wake capability may enter the Low Power Idle (LPI) mode to conserve energy during periods of low link utilization (see Clause 78). The deep sleep mode of EEE is not supported.Further relevant information may be found in Clause 1 (terminology and conventions, references, definitions and abbreviations) and Annex A (bibliography, referenced as [B1]， [B2]， etc.). The 50GBASE-SR, 100GBASE-SR2, and 200GBASE SR4 and 400GBASE- SR8 sublayers provide point-to-point 50, 100, and 200, and 400 Gigabit Ethernet links over one, two, or four,  eight pairs of multimode fiber, up to at least 100 m.
Change the second paragraph of 138.1.1 as follows:
For the 200GBASE-SR4 and 400GBASE-SR8 PMDs, the bit error ratio (BER) when processed by the PMA (Clause 120) shall be less than 2.4 x 10 4 provided that the error statistics are sufficiently random that this results in a frame loss ratio (see 1 .4.275) of less than 1.7x 10-12 for 64-octet frames with minimum interpacket gap when additionally processed by the PCS (Clause 119). For a complete Physical Layer, the frame loss ratio may be degraded to 6.2 x 10 for 64-octet frames with minimum interpacket gap due to additional errors from the electrical interfaces. If the error statistics are not sufficiently random to meet this requirement, then the BER shall be less than that required to give a frame loss ratio of less than 1.7x 10 12 for 64-octet frames with minimum interpacket gap.IEEE Std 802.3 pdf download.