Like other mobile addresses, the TSI address consists of the Mobile Country Code( MCC), the Mobile Network Code( MNC) and the Short Subscriber Identity( SSI). The MCC code comprises 3 digits (10 bits), the MNC code comprises 4 digits (14 bits) and the SSI code comprises 7 or 8 digits (24 bits). So that the total tetra address is 48 bits.
The subscriber short identifier, Short Subscriber Identity (SSI), can distinguish four receiver groups in its coding: An individual radio, Individual Short Subscriber Identity (ISSI), a talkgroup (GSSI) within a Tetra network, and foreign network subscribers that can be addressed by means of alias addresses, Alias Short Subscriber Identity (ASSI). The Tetra system addresses( TS) are also included.