In the face of new technologies, TETRA is still important

Terrestrial trunked radio (TETRA) is a professional trunking standard used in the public safety sector. It is a mature and stable technology supporting flexible networking with a powerful error correction and anti-interference capabilities. It also possesses the advantages of a complete industry chain and wide coverage.

http://www.ee.co.za/article/in-the-face-of-new-technologies-tetra-is-still-important.html