The requirements listed in this document aim at specifying interoperable functional elements:

• Data link: MAC, VL addressing concept

• Network: IP, ICMP

• Transport: UDP, TCP (optional)

• Network application layers: Sampling, Queuing, SAP, TFTP, and SNMP

This document will be limited to the description of the normative protocols listed above.

COMMENTARY

System designers may add other protocols on a case-by-case basis (example FTP at network application layer), but there is no requirement for an AFDX compliant LRU to implement this additional protocol.

Physical layer is not specified here, but should be any of the ARINC Specification 664, Part 2, defined solutions.

This means that any AFDX compliant LRU (including switch) can be connected to any AFDX network, as far as the Form and Fit requirements (specific to the System and not specified in this document) are respected.

Purpose of Document

The purpose of this document is to define a deterministic network: Avionics Full Duplex Switched Ethernet (AFDX™). AFDX™ is a trademark of Airbus and is used with permission. This document also highlights the additional performance requirements of avionics systems, within the context of AFDX.

This specification allows:

• System integrators to design flight critical systems using AFDX

• Equipment designers to specify equipment interoperable with AFDX