High density communication system

A communication system includes a receptacle connector assembly including a receptacle cage and a communication connector having an inner receptacle connector and an outer receptacle connector. The communication system includes a pluggable module received in the receptacle cage to mate with the communication connector. The pluggable module includes a pluggable body defining a module cavity. The pluggable module includes a module circuit board having mating pads at a mating edge of the module circuit board plugged into the inner receptacle connector and connector pads at a mounting location remote from the mating edge. The pluggable module includes a plug connector mounted to the mounting location. The plug connector includes plug contacts extending between a plug mating end and a plug mounting end. The plug mating end is plugged into the outer receptacle connector.