The document introduces the ADVA MicroMux, which enables 100GbE ports to support legacy 10GbE or 40GbE clients without loss of total system capacity. It can fit into existing QSFP28 cages without modification. The MicroMux is part of ADVA's FSP 3000 CloudConnect system, which offers high power efficiency, scalability from gigabits to terabits, and open hardware and software. The CloudConnect combined with the MicroMux allows for flexible client port configurations from 20 to 52 ports of 100GbE or 200 to 520 ports of 10GbE in a single system.