Communication system having coaxial connector assembly

A coaxial connector assembly includes a connector module having a connector body having contact channels holding coaxial contacts and a mounting frame defining a passage having a recess that receives the connector body. The mounting frame has a pocket open to the recess and a backing plate removably received in the pocket. The backing plate is coupled to the mounting frame to at least partially block the recess. The mounting frame includes blocking surfaces and the backing plate includes a blocking surface defining a confined space oversized relative to the connector module to allow a limited amount of floating movement in the confined space in a lateral direction that is perpendicular to the mating axis.