IFATCA Policy is:

Control of aircraft via ADS and Controllers/Pilot Data Link Communication (CPDLC) is sufficiently different to other forms of ATC rating to warrant comprehensive training and a separate rating.

The training syllabus should inter alia contain instruction in:

• Aircraft Situational Displays and Degraded Operational Modes;
• the CPDLC equipment and protocols including failure modes and procedures;
• ADS separation standards and, where applicable, ADS/Radar/Flight Data, Processor Track separation standards;
• aircraft emergency protocols and procedures. (Toulouse 98.C.6)