Integration and commissioning of the ATLAS Muon-to-Central-Trigger-Processor Interface for Run-3

<!--HTML-->The Muon-to-Central Trigger Processor Interface (MUCTPI) was completely redesigned as part of the ATLAS Level-1 trigger upgrade for Run 3 of the LHC. The new system is implemented as a single ATCA module, using three large state-of-the-art FPGAs and high-density fibre-optic modules. 208 high‑speed links receive trigger information from the muon trigger detectors, while 60 links are used to send processed trigger information to the Topological Trigger and the Central-Trigger-Processor. Extensive integration tests with all input and output systems have shown that the data transfer is stable and reliable. We will also report on the commissioning of the MUCTPI.