MENU

System enables precision latency measurements for automotive Ethernet

System enables precision latency measurements for automotive Ethernet

New Products |
By Christoph Hammerschmidt



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.


The R&S RTx-K35 software option for the R&S RTO oscilloscope enables precision latency measurements, for example monitoring the communication between two devices for a long period, and provides statistics on error rates as well as frame timing on the packets. The R&S RT-ZF7 test fixture acts as the link in the middle and allows the full monitoring between the transmitter and receiver device in both directions using the oscilloscope.

In combination with the suitable decoding option, the 100BASE-T1 time data can be measured frame-to- frame, and engineers can get full bus error statistics such as frame error rate and rate of consecutive errors. Moreover, they can perform precise timing measurements for all automotive serial bus protocols such as automotive Ethernet, CAN, CAN-FD, LIN, I2C and more.

More information on Rohde & Schwarz solutions for automotive Ethernet: www.rohde-schwarz.com/automotive/ethernet  

More information on TSN System’s automotive solutions: https://tsn.systems/  

If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :    eeNews on Google News

Share:

Linked Articles
10s