System enables precision latency measurements for automotive Ethernet

July 15, 2020 //By Christoph Hammerschmidt
System enables precision latency measurements for automotive Ethernet
With radar, lidar and camera sensors present in automobiles, time sensitivity on networks becomes extremely important. Test and measurement expert Rohde & Schwarz and time-sensitive networks specialist, TSN Systems devised a solution for timing measurements on in-vehicle networks using automotive Ethernet 100BASE-T1.

Advanced driver assistance systems (ADAS) require high bandwidth and low latency communications. Automotive Ethernet is becoming the de-facto communication solution to handle these requirements by offering higher data rates as well as time-sensitive network capabilities.

Together, Rohde & Schwarz and TSN Systems provide a comprehensive test solution for engineers who need to perform precise timing measurements on in-vehicle networks with nanosecond accuracy for Layers 1-3. In the collaboration, Rohde & Schwarz provides a tailored oscilloscope solution based on the R&S RTO, while TSN Systems contributes TSN Box, a hardware interface to the network and TSN Tools, a measurement and analysis software.

The test setup monitors an automotive Ethernet 100BASE-T1 communication link consisting of TSN Box 3.0 acting as talker, listener and test access point (TAP) device. The TSN Box 3.0 TAP device provides information to a PC with TSN Tools based on Layers 2 and 3. The TAP introduced 2x PHY delay for 100BASE-T1 at around 1.5 μs ±10 ns. The combination at Hand provides a broad range of functions to address validation and testing for time sensitive automotive Ethernet. While TSN Tools is a PC based analysis software performing visualization and deep detail analysis, TSN Box serves as a precise interface to the link. Based on its configuration, it can act as a generic TSN Talker/Listener device with nanosecond precision. The TAP can transparently synchronize itself to the gPTP master in the network. This allows powerful applications that need correlation between payload time stamps and TAP time.


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