The TTC (or TT&C) is responsible for making the communication between the Earth (aground station) and the satellite and is divided into two sub-modules: Beacon and down-link/uplink.

The beacon is an independent sub-module that transmits a periodic signalcontaining satellite identification data (ID) and some basic telemetry data. The down-link/uplink sub-module is theprimary communication device.

It has a bidirectional datalink to receive telecommands from the Earth and transmit all available data back to Earth.