The CMS Inner Tracker electronics system development and tests

<!--HTML-->A new Silicon Tracker will be built for the Phase 2 Upgrade of the CMS experiment. The innermost part, called the Inner Tracker, will be featuring high-granularity pixelated silicon sensors and will need to cope with extreme radiation levels and hit rates. The pixel electronics system is based on innovative solutions such as a new pixel ASIC developed by the RD53 collaboration, the novel serial powering scheme and advanced technologies for the high bandwidth readout system. The recently optimised design of the CMS Inner Tracker electronics system will be presented along with system test results with prototype components.