scope:

This ETS applies to the TETRA Packet Data Optimized (PDO) radio air interface standard with the specifications of layer 1, 2, 3, following the ISO model. Concerning layer 1 it defines the radio aspects like modulation, radio transmission and reception, synchronization, channel coding and multiplexing, radio link control. It defines the layer 2 service and protocol with the Protocol Data Units (PDUs). Finally it specifies the layer 3 service and protocol of the packet connection mode and of the specific connectionless mode. It defines also the service and protocol of the Mobility Management (MM) entity and of the Mobile Link Entity (MLE) sub-layer. The annexes concern mainly the parameter values and layer 2 and 3 mechanisms.