The TIM (TTC Interface Module) is the interface between the SCT off-detector electronics and the ATLAS Level-1 trigger. Each crate of
ROD (Read-Out Driver) modules contains a TIM, which receives the TTC (Timing, Trigger and Control) signals, and transmits the required information to the RODs via a custom backplane. The TIM is also capable of stand-alone operation, generating the signals as requested by the local processor.
See http://www.hep.ucl.ac.uk/atlas/sct/tim/ for further details