ARINC 658 was prepared to recognize the expanding role of data communication technology and the evolutionary path forward starting from ACARS protocols, to ATN/OSI protocols, and eventually ATN/IPS protocols using highly secure networks. The ATN/IPS network will be implemented onboard an aircraft and in the ground infrastructure to support safety services, including Air Traffic Services (ATS) and Aeronautical Operational Control (AOC). As such it provides a so-called “roadmap” for the development of the aviation standards for ATN/IPS services. ATN/IPS standards will evolve in coming years and be coordinated with other international standards organizations such as ICAO, EUROCAE and RTCA.