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The standards that define DMR consist of four documents:
TS 102 361-1: the DMR air interface protocol
TS 102 361-2: the DMR voice and generic services and facilities
TS 102 361-3: the DMR data protocol
TS 102 361-4: the DMR trunking protocol
http://www.etsi.org/deliver/etsi_ts/102300_102399/