The Tetra system, which will allow the transmission of voice and data services, comprises one main controller and one redundant controller, six base stations, 80 train-mounted radios and a CeCoCo integrated command and control solution.

Teltronic says the new system will modernise voice and data communication along the metro lines, replacing the legacy analogue system. Tetra meets the requirements of the Brazilian National Telecommunications Agency (Anatel) and includes functions such as GPS positioning, transmission of data messages, and secure communication.