scope:

This ETS defines the Terrestrial Trunked Radio (TETRA) system supporting Voice plus Data (V+D). In accordance with ITU-T Recommendations I.130 [28], the stage one, stage two and stage three of the three level structure is used to specify the TETRA gateway to Public Integrated Services Digital Network (ISDN): - Stage 1, is an overall service description, from the service subscriber s and user s standpoint; - Stage 2, identifies the functional capabilities and information flows needed to support the services described in stage 1, and