A wire containment cap includes a first side having a plurality of retainers for retaining wires, and a second side opposite the first side. Two sidewalls extend between the first side and the second side, and a support rib extends between the two sidewalls. The support rib includes two pair separators for separating wire pairs. In one embodiment, a plurality of sloped pair splitters is located between two of the retainers and includes a sharp point for cutting through insulation material on a pair of bonded wires. A communication jack assembly including a front portion and the wire containment cap is also described.