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It is important to clarify that the 100GBase-SR4 mode is mentioned in sections 7.2, 7.7.1, and 12.9.1; on pages 302, 311, and 834 of the Intel(R) Ethernet Switch FM10000 Datasheet document # 333497. The other mode is unmentioned on the cited document.
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It is important to clarify that the unmentioned information in the documentation of the Intel devices has not been tested or validated with them.
Due to this fact, the cited mode should be tested and validated by your own.