A connector assembly is provided with opposing and interengageable first and second connector components. Each of the two components has internal cavities that contain terminal assemblies of either plug or receptacle structure and may further include either a plurality of power terminals or differential signal terminals. The terminals have contact portions, tail portions and interconnecting portions that are partially encapsulated by an insulative outer support frames. The shell forms a wafer and two such wafers are combined together to form a terminal assembly. The terminal assemblies are identical in shape, other than for an engagement means that serves to hold two subframes together as a single assembly.