The CMS Regional Calorimeter Trigger Electronics Integration

The electronics for the regional calorimeter trigger (RCT) of the Compact Muon Solenoid experiment (CMS) at the Large Hadron Collider (LHC) have been produced and tested, and are being integrated with the experiment at CERN. The RCT hardware consists of 18 double-sided crates containing custom boards, ASICs, and backplanes all running at 160 MHz frequency. The RCT receives 8 bit energies and a data quality bit on 1008 4times1.2 Gbaud copper links from the hadron calorimeter (HCAL) and the electromagnetic calorimeter (ECAL) trigger primitive generators (TPGs), accepting new events every 25 ns. RCT processing determines the jet region energies, and, sorted isolated and non-isolated electromagnetic objects, which are sent to the CMS global calorimeter trigger (GCT) for further processing. Before installation, both self-tests, using RCT jet capture card, and integration tests with TPG and GCT systems were performed. Their results of these tests and the RCT installation experience are described.