M17 is an RF protocol that is:
Capable of doing the things hams expect their digital protocols to do:
To do this, the M17 protocol is broken down into three protocol layers, like a network:
This document attempts to document these layers.
.. [TETRA] Dunlop, John; Girma, Demessie; Irvine, James "Digital Mobile Communications and the TETRA System" Wiley 1999, ISBN: 9780471987925
.. [DMR] ETSI TS 102 361-1 V2.2.1 (2013-02): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital Mobile Radio (DMR) Systems; Part 1: DMR Air Interface (AI) protocol" https://www.etsi.org/deliver/etsi_ts/102300_102399/10236101/02.02.01_60/ts_10236101v020201p.pdf