After the modules and optional power supply are installed and you have verified the switch passes self test, you are ready to mount the switch in a stable location. The 5400R zl2 switches can be mounted in a 19-inch telco rack, in an equipment cabinet, or on a horizontal surface. An optional HPE X450 4U/7U Universal 4-Post Rack Mounting Kit (J9852A) is available for mounting 5400R zl2 switches in a cabinet. However, if you want to ship in a cabinet or rack, its recommended to use the 4-post kit in a HPE rack. See the installation details for more information.