The two main Telemetry functions

 * Immediate Visual Control (CVI)

Data extracted from the Telemetry chain for Immediate Visual Control provide Arianespace and Flight Safety with real-time information about how the launcher is performing and how the sequence of events is proceeding.   In addition, a CVI room is made available to Arianespace during the final rehearsal and launch: if the values provided by telemetry correspond to the predetermined values, then the Arianespace representative can give the Director of Operations (DDO) in the Jupiter room nominal information about the launcher's performance from T0 to the end of the mission after payload separation.

  Orbit insertion diagnostics: generated by the Telemetry department for Arianespace, the orbit insertion diagnostics for each payload indicate the orbits and attitudes into which the satellites have been inserted.  They provide tangible evidence of the mission's success.

 * Offline Visual Control (CVD)

Offline Visual Control consolidates the telemetry information from all the stations in the network called upon, anywhere between 1,200 and 1,500 parameters which vary according to the launch and the equipment used.  All these data are transmitted to the Offline Processing Centre in Toulouse, which reconstructs the entire flight and uses the data as references to enrich an enormous database for 'level 0 use' by Arianespace: these telemetry data will be carefully exploited to enable the next launch to be authorised.

The telemetry system may also be required to:

-          transmit information extracted from Immediate Visual Control to Toulouse in real time, while certain satellites are being positioned in orbit;

-          provide plots and detailed analyses in the event of any anomalies arising;

-          set up a shelter on a boat for observing fall-back from the solid booster stages (EAP);

-          set up a mobile land or naval  station, as well as head-end station telemetry kits which are interfaced with the antennas of overseas stations during launches involving atypical trajectories.