n (DMO): Series 300 392 Voice plus data (V + D) Series 300 394 Conformance testing specification 300 395 Speech codec for a full-rate traffic channel 300 396 Technical requirements for a direct mode operation (DMO) 300 812 Security aspects; subscriber identity module to mobile equipment (SIM ME) interface TR 101 494 SIM review 01040 Security lawful interception (LI) interface TS 101 789 1 Trunked mode operation (TMO) repeaters. Part 1: requirements, test methods and limits EN 301 435 Attachment requirements for TETRA EN 303 035 Harmonised EN for TETRA equipment covering essential requirements under article 3.2 of the Radio and Telecommunications Terminal Equipment (R&TTE) Directive ETR/TR 300 Voice plus data (V + D) designer's guide TR 102 021 User requirement Specification TETRA release 2 ETR 300-1/2 is suggested as reading for beginners who are approaching the study of this system in order to gain an overview of the standard and the features of TETRA. TETRA Services TELESERVICES BEARER SERVICES NT or TETRA Possible transit Terminating NT or Network Network Network, ISDN or TETRA Network NT= Network Termination MT= Mobile Termination TE= Terminal Equipment Figure D.1 TETRA services D.2 TETRA Services The TETRA standard defines the following services (Figure D.1): Bearer services Teleservices Supplementary services A bearer service provides a communication capability between terminal network interfaces, excluding the functions of the terminal. It is characterised by some lower layer attributes (layers 1 to 3). The bearer service includes the individual call, group call, acknowledged group call and broadcast call for each of the following: Circuit mode unprotected data 7.2; 14.4; 21.6; 28.8 kbps Circuit mode protected data 4.8; 9.6; 14.4; 19.2 kbps Circuit mode protected data 2.4; 4.8; 7.2; 9.6 kbps Packet connection oriented data Packet connectionless data A teleservice provides the complete capability, including terminal functions, for communication be- tween users. Thus in addition to the lower layer attributes