Earners of this badge will understand that the TETRA core network, known as the Switching and Management Infrastructure (SwMI), is not defined in the TETRA standard. However, they will appreciate that core network elements must exist and they will be able to describe the NMC, OMC, Database, Switching, Processing and Gateway functionality required from the SwMI. They will also understand the functionality required from the base stations and mobile stations deployed within TETRA networks.