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The SDM (Synchronous Data Manager) application optimises data transmission over the air interface from the on-board equipment to the Control Centre. The application is based on standard TETRA service SDS and consists of a smart polling of the whole fleet of terminals (vehicles/trains and others).

In the transport sector, this application is usually used for the transmission of:

  • Alarms
  • Events
  • Operational vehicle information
  • Status of on-board subsystems
  • Position information

This application guarantees an efficient use of TETRA control channels (MCCH/SCCH) so that voice and data services coexist simultaneously and the quality of them is not undermined.