The CMS Drift Tubes readout system has been upgraded during the 2017-2018 technical stop to
a new MicroTCA-based system to deliver the performance required by the increase of LHC
luminosity. It comprises 3 µTCA crates with up to 25 boards, each processing 3 sectors from
each CMS wheel. The µROS board is built around a Virtex-7 FPGA, and is able to receive 72
input links. The 240-Mbps inputs are deserialized using oversampling and adaptative phase
detection. Event building, synchronization, data integrity monitoring and error correction have
been implemented. The uROS system is fully operational, taking collision data satisfactorily.