A cassette includes a housing having a front and a rear. The housing has a plurality of plug cavities open at the front for receiving plugs therein, and the housing has a rear chamber open to the plug cavities. The cassette also includes a contact subassembly having a circuit board and a plurality of contacts arranged in contact sets coupled to the circuit board. Each contact set is configured to mate with a corresponding plug, where the contact subassembly is loaded into the rear chamber such that the contact sets are received in different corresponding plug cavities. The circuit board is oriented generally parallel to the front of the housing when the contact subassembly is loaded into the rear chamber.