scope:

This ETS defines the interface between the Subscriber Identity Module (SIM) and the Mobile Equipment (ME) for use during the network operation phase of TETRA as well as those aspects of the internal organization of the SIM which are related to the network operation phase. This is to ensure interoperability between a SIM and an ME independently of the respective manufacturers and operators. The concept of a split of the MS into these elements as well as the distinction between the TETRA network operation phase, which is also called TETRA operations, and the administrative management phase is described in the User Requirement Specification ETR 295 [9].