网络作为航电系统的核心部分，其性能直接影响航电系统。AFDX网络是新一代航空电子系统的传输网络技术，具有高速、确定性和稳定性的特点。在深入研究AFDX网络协议的基础上，结合航电网络的实际应用，根据AFDX端系统关于冗余管理、完整性检测和VL隔离的特点，提出了一种AFDX端系统协议软件的设计方法。该方法通过采样、队列和SAP 三类端口实现了AFDX标准数据的发送和接收功能，支持10 (Mb·s-1)/100 (Mb·s-1)的数据传输,并采用了VL管理、冗余管理和完整性检测方法，有效提高了数据传输的确定性和稳定性。多次的功能和性能测试表明，该软件设计方法实现了ARINC664 P7协议规定的AFDX端系统协议栈功能，具有良好的正确性和可靠性。

The networks performance may affect the avionic system directly as the key part of the later.Avionics Full Duplex Switched Ethernet (AFDX) is a new aircraft data networkwhich has the characteristics of high-speedreal-time and redundancy.According to the characteristics of AFDX end system in redundancy managementintegrity checkingand Virtual Link(VL) isolationa method for develop the AFDX End System protocol software was proposed according to avionics network application.The software implemented AFDX data transmitting and receiving functions through three types of portincluding samplingqueuing and SAP portwhich supported data transmission on speed of 10 (Mb·s-1) /100 (Mb·s-1).FurthermoreVL managementredundancy management and integrity checking were adopted to enhance the determinacy and reliability of data transmission.Extensive function tests and performance tests illustrated that the software can realize the end system function specified in ARINC664 P7which has fine determinacy and reliability.