This 24-page tutorial provides an in-depth technical review of AFDX protocols and implementations. One thousand times faster than previous ARINC 429 communications, Avionics Full DupleX Switched Ethernet (AFDX) builds upon the original AFDX concepts for using Ethernet in avionics, as introduced by Airbus. AFDX defines the electrical and protocol specifications (IEEE 802.3 and ARINC 664, Part 7) for the exchange of data be­tween Avionics Subsystems.