1. ETSI EN 300 396 (all parts): “Terrestrial Trunked Radio (TETRA), Technical requirements for Direct Mode Operation (DMO)”.
2. ETSI TS 100 392-2 (V3.1.1): “Terrestrial Trunked Radio (TETRA), Voice plus Data (V+D), Part 2: Air Interface (AI)”.
3. ETSI TS 101 747: “Terrestrial Trunked Radio (TETRA), Voice plus Data (V+D), IP Interworking (IPI)”.
4. ETSI TR 102 021-2: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 2: High Speed Data”.
5. ETSI TR 102 491 (V1.2.1): “TETRA Enhanced Data Service (TEDS); Electromagnetic compatibility and Radio spectrum Matters (ERM)”.