The ITSI consists of the Tetra Mobile Country Code (TMCC), the Tetra Mobile Network Code (TMNC) and the Short Subscriber Identity ( SSI).
The Tetra Mobile Country Code is the country code for Tetra networks. The country code comprises 10 bits and has the number 262 for Germany. The Tetra Mobile Network Code is 14 bits long and is used together with the country code for the ITSI block identifier. The Short Subscriber Identity consists of 24 bits and identifies the end subscriber.