Upgrade of the second level of the readout electronics for the CMS drift tubes subdetector

The readout server (ROS), which constitutes the second level of the CMS drift tubes (DT) subdetector readout architecture, is a complex VME 9U board, currently placed in the CMS cavern, in the racks on one side of the detector wheels. The planned upgrade of DT electronics for 2013-2014 includes the relocation of all the second level of readout and trigger electronics in the CMS counting room, allowing among others, the future redesign of a higher performance ROS board based on commercial devices with no radiation tolerance requirements.