Upgrades to CMS Cathode Strip Chambers' electronics with a focus on ODMB7/5s

As the LHC prepares for the high luminosity runs (HL-LHC) all detector systems have to brace for around 5 times the LHC's nominal instantaneous luminosity. With higher luminosity the particle flux in the muon Cathode Strip Chambers (CSC) closest to the beamline is expected to quadruple from Run 2 levels. This presents two larger needs: higher bandwidths for an increased amount of data and electronics boards that can withstand high doses of radiation. To address these needs upgrades to the CSC are divided into two sections; an extensive program of primarily upgrading the front-end electronics has been accomplished during Long Shutdown 2, and remaining upgrades to the back-end boards will be installed during Long Shutdown 3. We present these planned upgrades, current state of testing, and planned installation for the CSC electronics boards. A focus of this poster will be on the Optical Data Acquisition MotherBoards (ODMBs) which collect data from anode-wire and cathode-strip boards on the CSC detector. The ODMB upgrade is for 180 boards used by parts of the CSC closest to the beamline and can support data rates of up to 50 Gb/s.