Design And Implementation Of TTE Network Monitoring Switch

Time Triggered Ethernet(TTE)can not only provide users with high-bandwidth,highdeterminism,and high-reliability network transmission services,but also provide TT/RC/BE and other services in the same network.Integrated transmission will surely become the nextgeneration new aerospace bus network technology.The TTE network monitoring switch is mainly used to monitor,collect and record the working data flow of TTE network products.By analyzing the data,we can better understand and grasp the synchronization workflow,service performance and network running status of the TTE network.TTE network monitoring switches can also be used to locate network faults to find incompatibility problems in the networking of equipment from different manufacturers,and can monitor network protocol inconsistencies,which has very important practical value.Based on the scientific research project "Airborne Bus Network Data Interface Design and Verification Environment",this thesis focuses on the design and implementation of key technologies of TTE network monitoring switches.This thesis firstly introduces the research background of time-triggered Ethernet and the development status at domestic and abroad,and points out the necessity and importance of this research content.Secondly,the thesis introduces the working principle of TTE network,three business service attributes,and three core network technologies such as 6802 synchronization protocol,1588 synchronization protocol,and network monitoring.Thirdly,the overall design scheme of TTE network monitoring switch is proposed,and the detailed design and implementation of key modules such as receiving queue,network aggregation,definition of monitoring frame secondary encapsulation format,and aggregation flow interface processing module are expounded.Fourth,the simulation environment of TTE network monitoring switch was built to simulate and verify each functional module.Finally,a board-level test platform for TTE network monitoring switches was built.The actual test results show that the implementation scheme of the TTE network monitoring switch designed and implemented in this thesis is correct and reasonable,and it can monitor the TTE network service flow in real time according to the expected goals,and successfully locate the fault cause of the monitored switch.The innovation of this thesis includes three aspects.Firstly,a monitoring field suitable for TTE network is designed based on AS6802 and IEEE 1588 protocol,so that each input frame can carry the information of relative timestamp and absolute timestamp.Secondly,by inserting and connecting TTE network monitoring switch to multiple links of the TTE network,the aggregation of multiple network links is realized.The aggregated data stream can be transmitted to the data recorder through the 10 G optical port.Record data frames on all links connected to the monitoring switch,provide data analysis support for TTE product compatibility test.Thirdly,the real-time monitoring function is realized.It can be connected to the host computer through the 10 G aggregation optical port or 1G mirror optical port of the monitoring switch,and view the data stream which we want to monitor in real time through the Wireshark monitoring software.