While 400G Ethernet optical transceivers are used in hyperscale data centers, and many enterprise businesses are currently operating on 40G or 100G, data center connectivity development is moving towards 800G. While “big picture” perspectives on the move to 800G are being discussed for some time, this presentation will talk about the choices in available tools and what network operators need to know to be ready for making the move. The question is not whether data center operators need to upgrade to meet the increasing demand for bandwidth, but when and how. The good news is that with a flexible infrastructure, it is possible to upgrade from 100 to 400 to 800G with surprisingly few changes.