The Timing, Trigger and Control (TTC) distribution system must ensure high-quality clocking of the CMS experiment to allow the physics potential of the LHC machine to be fully exploited. This key system provides the synchronization tools – bunch clock, first level Triggers and fast commands – that enable all sub-detector systems to take data for the same LHC collision. Its installation is described, along with the tools used to commission and synchronize the system
