Cetis Scitec 2554E Red Scitec 2554E Red The 2554E telephone is designed for use behind a registered PBX system. The telephone user or system installer must supply an RJ-11W modular wall jack to connect this telephone to the PBX system. The PBX station port type must be Industry Standard Analog or POTS. This telephone cannot be used with digital PBX station ports.