Renesas TSN demonstrations
At the AVnu Plugfest, Renesas has demonstrated standard compliance and interoperability for frame preemption, an essential feature for TSN Time Sensitive Networking. Ethernet TSN standards are currently under development by the TSN task group of IEEE802.1. Their goal is to pave the way for seamless deterministic communication via Ethernet for automotive in-vehicle networking and within the industrial internet.
Recently, the extension of the Ethernet AVB (Audio Video Bridging) standards for professional audio and in-vehicle networks, etc. is progressing. The standards cover several features, including time synchronization as well as traffic scheduling, frame preemption and ingress policing. With these features, the TSN technology is expected to accelerate the harmonization of Ethernet technologies in Industry 4.0 applications.
Renesas has developed a demonstration for industrial networking to illustrate the potential benefits of the TSN standard. This TSN demonstration is designed with the factory network in mind where various devices are connected. This demonstration showcases the effects of TSN features on motor control for which real time control is essential, on a network where traffic from various devices coexists.
Along with many standard switch features, the TSN demonstrations specifically includes:
- Forwarding and Queuing Enhancements for Time-Sensitive Streams (IEEE 802.1Qav): This is a mechanism to shape the traffic by establishing a fairness transmission of priority traffic by reservation of limited bandwidth per traffic class; this is also known as “Credit-Based Shaping”
- Enhancements for Scheduled Traffic (IEEE 802.1Qbv): With this feature, the traffic can be classified to one of the eight traffic classes, and the classes can then be scheduled to allow for them to communicate at a fixed repetitive cycle.
- Timing and Synchronization (IEEE 1588v2 / IEEE 802.1AS): This is the classic master-slave protocol to synchronize the clocks between the network participants
- Frame Preemption/Interspersing Express Traffic (IEEE 802.1Qbu/802.3br): A new mechanism that allows a time-critical frame to interrupt a non-time-critical frame in order to reduce latency.
Renesas intends to continue to support promotion of the Ethernet TSN standard and its adoption in the industrial fields to contribute to the development of Industry 4.0.