Research On Time-triggered Network Preformance Monitoring Technology

In order to ensure that the end-to-end transmission delay in the network meets certain time constraints,and the transmitted messages can be sent and received in the order planned in advance,time-triggered technology has become a research hotspot in the field of avionics networks in recent years.And time-triggered Ethernet combines time-triggered technology with traditional Ethernet,which increases the real-time determinism of the network on the basis of Ethernet flexibility;while time-triggered FC network uses the high bandwidth,high rate,and low latency of FC network And other characteristics,both have a profound impact on the development of avionics networks.Based on the existing hardware technology and equipment of time-triggered network,this paper designs and implements a set of software platform suitable for both TTE and TTFC systems,mainly monitoring performance parameters include of the delay of sending and receiving node services in the network,synchronization state and basic state information of nodes,etc.Not only can it configure and monitor the parameters of each network node in the system,but also can verify the fault-tolerant synchronization function of the system.The main work of the paper includes:(1)Research event-triggered and time-triggered technology,introduce the existing time-triggered Ethernet and time-triggered FC network technical solutions and time synchronization methods,to provide a basis for software requirements and part of the functional design.(2)Research The specific process of the AS6802 fault-tolerant synchronization algorithm,which provides a theoretical basis for the design of the system's fault-tolerant verification scheme.(3)Deeply research the overall architecture and software implementation of the time-triggered network performance monitoring system.This includes the design and implementation of communication methods among computers and computers,among computers and switches,among computers and node cards or adapter cards in the network,design and implementation of functional modules such as physical topology of host computers,node configuration,and performance monitoring,the software design and implementation of the lower computer,and the design and implementation of driving each functional module.(4)Research time-triggered fault tolerance verification scheme of network system,which can test the fault-tolerant synchronization process of the system.(5)Based on the software implementation scheme designed in this paper and the existing time-triggered network equipment,complete the time-triggered performance monitoring system including upper computer interface,lower computer software and device driver software,and build the corresponding time-triggered network test environment.Finally,completed the function test of time-triggered performance monitoring system and the fault-tolerant verification of time-triggered network.