Traffic Management of Switch Port Time Firewall Based on Time-triggered Switch

Abstract

The invention discloses a traffic management method of a time firewall of a switch port in a time-triggered network. On the basis of providing time synchronization based on a switched network system, the synchronization clock of the switch performs periodic timing and exchange scheduling according to the communication cluster cycle, and adopts The virtual logical link is routed and forwarded, and the time slot allocated to the virtual logical link according to the offline time-sharing mechanism is used to realize the time firewall function: the logical link parameters of the switch generated by the offline configuration and the corresponding time slot are online Load the configuration to the space of the switch to store the routing configuration. This space is composed of an address list. Each address stores the time slot information corresponding to the ID number of the logical link. Each port of the switch receives the data frame to extract the ID information of the logical link. Obtain the time slot corresponding to the logical link as an address list query input, record the real-time receiving time window of the frame, and compare whether the receiving time window falls within the time slot range.

Description

【Technical field】 [0001] The invention belongs to the technical field of airborne bus communication in an avionics system, in particular to a design method for data communication fault isolation and flow control under a time-triggered communication architecture. 【Background technique】 [0002] With the rapid development of sensor technology in the field of avionics, the types and quantities of sensors integrated in the airborne aircraft system are increasing. System users do not have the characteristics of different sensor data transmission requirements, so avionics communication is required to be oriented to different safety criticality and real-time distributed communication. Traditional aviation airborne communication networks such as optical fiber Ethernet, AFDX, and FC adopt event-triggered communication mechanisms. Due to the random access transmission method, transmission competition will inevitably bring uncontrollable delay and jitter to the system. , unable to mee...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a time-triggered flow management method for a time firewall of a switch port in a time-triggered network, which is used to solve the problem of transmission competition caused by the use of random access transmission in the existing communication mechanism, which brings uncontrollable delay and delay to the system. The problem of jitter and not being able to meet safety-critical requirements at different times

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