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AFDX是双余度、可确定的数据传输网络。TAP卡是将设备接入网络中,在保证原来的双向通信正常进行的同时,将原来两个方向的数据分别复制一份输出到TAP端口上。为了研究AFDX网络特性,对AFDX网络的数据和流量进行监控与分析。文中介绍了AFDX网络基本特性,重点描述了AFDX网络TAP卡的设计实现。该TAP卡利用标准的以太网PHY接人AFDX网络,通过FPGA逻辑对接收到的网络数据进行存储,并通过USB接口上传给主机软件。测试结果表明,该TAP卡能够在不影响网络传输的前提下,正确全面地对AFDX网络的数据进行监控。
AFDX is a double redundancy, deterministic data transmission network. TAP card is the device access network, to ensure that the original two-way communication is normal at the same time, the original two directions of the data were copied a copy of the output to the TAP port. In order to study AFDX network characteristics, the AFDX network data and traffic monitoring and analysis. This paper introduces the basic characteristics of AFDX network, focusing on the AFDX network TAP card design and implementation. The TAP card accesses the AFDX network using a standard Ethernet PHY, stores the received network data through FPGA logic, and uploads it to the host software through the USB interface. The test results show that the TAP card can correctly and comprehensively monitor the data of the AFDX network without affecting the network transmission.