Verifying the effect of electro-magnetic noise on an in-vehicle Ethernet network

The uses of new test methods and test equipment

Automotive noise white paper coverThe Time-Sensitive Networking (TSN) extension of the standard Ethernet protocol is gaining widespread support in the automotive sector as a backbone network technology. Since Ethernet uses a switch-based architecture, it enables manufacturers to increase the number of nodes in new vehicle designs while reducing the number and length of their data cables.

Unlike older automotive network technologies such as CAN and FlexRay buses, which used a balanced electrical interface, Ethernet components and systems typically use an unbalanced interface which is more susceptible and vulnerable to interference from electromagnetic noise sources. It is crucial for manufacturers of electronic control and infotainment modules, and for the vehicle manufacturers which use them, to carefully verify that the Ethernet networking interface performs as specified under all operating conditions.

This paper describes how the principles of laboratory testing of electrical noise impairment can be followed in the automotive sector in order to dramatically reduce the manufacturer’s development time and effort while providing comprehensive verification of the safe and predictable performance of Ethernet networks under any realistic real-world conditions.

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