Lessons from integrating CMS Phase-2 back-end electronics and first results from Serenity-S1, a production optimised ATCA blade

The Serenity-S1 is a Xilinx VU13P based Advanced Telecommunications Computing Architecture (ATCA) processing blade that has been optimised for production. It incorporates many developments from prototype cards and where possible adopts solutions being used across CERN. It uses many new parts because commonly used parts have disappeared from the market during the semiconductor crisis with only some returning. We discuss improvements to simplify manufacture, the performance of new components, some of the more difficult aspects of procurement, the performance of production-grade Samtec 25 Gb/s optical firefly parts and issues with the rack cooling infrastructure.