CMS Phase-2 data acquisition, clock distribution, and timing: prototyping result and perspectives

<!--HTML-->The CMS detector will undergo a major upgrade for Phase-2 of the LHC program: the HiLumi LHC. The Phase-2 CMS back-end electronics will be based on the ATCA standard, with node boards receiving the detector data from the front-ends via custom, radiation-tolerant, optical links. An ATCA hub board, the DAQ and Timing Hub, will provide the interface between the back-end nodes and the central Trigger, Timing, and DAQ systems. This paper presents the progress on the development towards the DTH design. Measurements are presented showing the performance achieved for all main DTH tasks: clock distribution, DAQ throughput, and hub-to-node networking.