Controller–pilot datalink communications (CPDLC) is a method by which air traffic controllers can communicate with pilots over a datalink system in place of voice communication by data messages. The standard method of communication between an air traffic controller and a pilot is voice radio, using either VHF bands for line-of-sight communication or HF bands for long-distance communication.
The Network Manager provides data link performance monitoring at a European level to support all stakeholders. It provides both regular performance reports as well as ad-hoc performance reports on request for individual stakeholders to allow them to assess their own performance. NM also has activities to forecast the future load of data link as well as maintains a database of data link related avionics installed on aircraft operating in Europe.
The service is restricted to specific stakeholder groups.