Ethernet concentrator with fault diagnosis and isolation function

Abstract

The invention provides an Ethernet concentrator with a fault diagnosis and isolation function and belongs to the technical field of airborne network communication. According to the concentrator, a network communication system can be changed from a bus topology to a star topology. The concentrator has the advantages of convenient connection and high expandability. Influences of bus circuit break onthe whole communication system are reduced. However, a whole communication network still can be paralyzed due to faults such as link short circuit or node disordered distribution. For the problem, the invention provides a fault diagnosis and isolation scheme. Whether communication nodes and links are normal or not is monitored in a mode that Ethernet data transceiving modules communicate with each node independently, and the influences of fault nodes on the communication links are shielded through utilization of control switches. The fault diagnosis and isolation scheme has the advantages that the fault diagnosis accuracy is high, the detection speed is fast, the fault nodes and links can be effectively isolated, and the reliability and the fault-tolerant capability of the communication system can be improved.

Description

technical field [0001] The invention belongs to the technical field of airborne network communication, and relates to a highly reliable Ethernet hub. Background technique [0002] The time-triggered bus has the advantages of high communication efficiency and easy monitoring of faults, and is widely used in safety-critical systems in the aerospace field. However, the time-triggered bus only considers the problem of fault monitoring at the link layer, and does not consider the problem of node or link faults at the physical layer. Since the bus-type topology shares the same physical link, it is greatly affected by faults such as open circuit and short circuit. Using a hub to change the bus-type topology into a star-type topology can realize the mutual independence of some physical links, but it still cannot deal with the impact of random communication nodes or link short-circuit failures on the entire communication system. In addition, there are various types and modes of fau...

AI Technical Summary

Problems solved by technology

However, the time-triggered bus only considers the problem of fault monitoring at the link layer, and does not consider the problem of node or link faults at the physical layer.

Since the bus-type topology shares the same physical link, it is greatly affected by faults such as open circuit and short circuit

Using a hub to change the bus-type topology into a star-type topology can realize the mutual independence of some physical links, but it is still unable to deal with the impact of random communication nodes or link short-circuit failures on the entire communication system

In addition, network communication links have various fault types and modes, and the fault time is seriously uncertain. How to quickly and accurately detect and judge the fault location is also an important problem.

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