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Avnu tests demonstrate the capabilities of TSN

Avnu tests demonstrate the capabilities of TSN

Avnu tests demonstrate the capabilities of TSN

The Avnu Alliance has carried out a range of tests to demonstrate how Time Sensitive Networking (TSN) enhances accuracy and reliability in time-critical industrial applications. Avnu members ran the tests to demonstrate the capabilities of TSN over wireless links for businesses using robotic control and industrial automation.

The TSN capabilities of time synchronisation (802.1AS) and traffic shaping (802.1Qbv) over Wi-Fi were tested in industrial automation applications. During testing, a remote-controlled robotic arm was made to perform several fine manipulation tasks demonstrating the use of time synchronisation and time-aware scheduling capabilities. Avnu members observed that without the 802.1Qbv capability, the task was severely impacted by competing traffic, however when the TSN capability was enabled, even whilst competing traffic was present the arm successfully completed the manipulation task. The robot control actuation and gripper status was consistently delivered over the wireless link, with most actuation commands arriving within 2 ms of the previous sample.

Avnu Alliance president and chair of the Wireless TSN working group, Dave Cavalcanti, said that he believed advances in wireless technologies could hold the potential to transform the industrial and pro AV applications, but that low latency and high reliability is required for these to be used successfully.

“The results, testbeds and application demonstrations showcased in our latest whitepaper proves the potential of TSN over Wi-Fi for industrial and pro AV use cases, validating capabilities such as time synchronisation and bounded latency,” he explained.

When testing TSN in industrial automation applications, Avnu members wanted to demonstrate that wireless TSN ensures high priority traffic benefits from low latency, resulting in a faster response time and safer automated operations. Throughout testing, the 802.1Qbv traffic shaping capability was used to schedule a time-sensitive queue to open whilst other queues closed to avoid conflict with high priority traffic. Measuring the end-to-end latency of the time critical traffic when background traffic was present, the lowest average latency was 1.1 ms, with a bounded latency of 2 ms.

When testing the benefits and capabilities of Wi-Fi TSN for pro AV applications, Avnu designed a testbed to stream audio from a P1 Talker to a Listener over Ethernet and Wi-Fi. Members experimenting with end-to-end 802.1AS-based time synchronisation found the maximum offset introduced by the wireless link was approximately 4 μs.

The Avnu Wireless TSN Working Group is also developing test specifications for TSN over Wi-Fi to ensure interoperability. As a member of the Avnu Alliance, Keysight play a role in standardising test methodologies for TSN over Wi-Fi, Keysight’s automated Wi-Fi compliance package, based on the Avnu TSN test plans will assist Avnu members and test houses advance the TSN Wi-Fi ecosystem.

Ram Periakaruppan, vice president and general manager, Keysight's Network Test and Security Solutions group commented: "Validation of TSN standards are increasingly important to ensure that network devices work together at the component level.”

The wireless capabilities of TSN are in play across Avnu Plugfest events, and ongoing work is being done to extend them to 5G systems.

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