来自IEEE Xplore官网，IEEE Std 802.3cm-2020 (Amendment to IEEE Std 802.3-2018 as amended by IEEE Std 802.3cb-2018, IEEE Std 802.3bt-2018, IEEE Std 802.3cd-2018, IEEE Std 802.3cn-2019, IEEE Std 802.3cg-2019, and IEEE Std 802.3cq-2020)，开发400GBASE-SR8、400GBASE-SR4.2等产品必备