Juniper Ethernet Universal Physical Interface Modules (UPIMs) are a set of common Ethernet interface modules that are shared between the Juniper Networks Secure Services Gateway 140, 520, 520M, 550, 550M, J4350 & J6350. These modules implement the full set of layer 3-7 services offered in the Screen OS & JUNOS operating systems & alternatively implement Ethernet switching for connecting local servers & PCs to the network.