"Avionic Full-Duplex Switched Ethernet" (ARINC 664 Part 7) is a deterministic aircraft data network bus system for public avionic transportation, railway and military systems. The network is based on standard IEEE802.3 Ethernet technology.
The benefit of using commercial-off-the-shelf (COTS) Ethernet components is to lower overall costs for the aircraft network. Hardware components, cables and test equipment for Ethernet are field proven and much more affordable than the previously used Avionics specific solutions. Ethernet itself won't meet avionic network requirements.
Therefore, ARINC 664 Part 7 extends the Ethernet standard by adding Quality of Service (QoS) and deterministic behavior with a guaranteed dedicated bandwidth. This Avionics data network was first used in the Airbus A380 and A400M. Airbus and Boeing will extend the usage of ARINC 664 Part 7 in future developments.