Technologies

The technology marketed by TTTech Group companies today is based on research at the Vienna University of Technology. Research into time-scheduled distributed systems for the purpose of deterministic controls dates back to the early 1980s. Core elements of the architecture that came out of this research are clearly recognizable in Deterministic Ethernet such as Time Sensitive Networking (TSN) and Time-Triggered Ethernet today. These elements include network-based clock synchronization, scheduling of critical resources and redundancy management as a platform service.

Deterministic Ethernet technologies share the core concepts of deterministic and reliable operation, but also the requirement to build upon standard components. From the original development of Time-Triggered Ethernet in 2006 for the NASA Orion spaceship (launched in 2014), time scheduling of Ethernet has been used in a range of aerospace, automotive and industrial applications. The IEEE Time Sensitive Networking task group started standardizing the core mechanisms of time scheduling in IEEE 802.1 in 2012. To date, all of the mechanisms are published or are available in a mature version.

TTTech combines a deep knowledge of managing deterministic, high-availability networks with a long experience in delivering architectures and solutions for a wide spectrum of distributed applications.

Deterministic Ethernet

Deterministic Ethernet refers to a networked communication technology that uses time scheduling to bring deterministic real-time communication to standard IEEE 802 Ethernet. Deterministic Ethernet operates using a global sense of time and a schedule which is shared between network components.

By using Deterministic Ethernet customers can converge real-time controls traffic with regular best effort traffic on one Ethernet network. Time-scheduled traffic is partitioned from all other network traffic and is therefore immune from disturbance. This means that in a Deterministic Ethernet network, latency of critical scheduled communication is guaranteed.

Deterministic Ethernet is used in a wide range of applications where guaranteed latency is vital, either for reasons of operational efficiency or functional safety. These include autonomous driving, machine-to-machine communication and aerospace flight control. TTTech supports the Deterministic Ethernet technologies Time Sensitive Networking (IEEE TSN) and Time-Triggered Ethernet.

Time Sensitive Networking (IEEE TSN)

Time-Sensitive Networking (TSN) is a set of IEEE 802 Ethernet sub-standards that are defined by the IEEE TSN task group. These standards enable fully deterministic real-time communication over Ethernet. TSN achieves determinism over Ethernet by using a global sense of time and a schedule which is shared between network components.

Time-Triggered Ethernet

Fault-tolerant clock synchronization mechanism (SAE AS6802) is used to synchronize non-faulty networking components even in the present of faulty clocks. This provides Guarantee of Service for safety systems, even in the presence of faults (fail operationality). Messages are forwarded in an extremely precise way, down to the individual packet. This enables a granular control over time-scheduled traffic.

Time-Triggered Protocol (TTP)

The time-triggered communication protocol TTP® was designed to reduce the complexity of distributed fault-tolerant architectures. TTP is used in commercial applications since 2002. It enables reliable distributed computing and networking at lower lifecycle costs. This modular control system platform technology supports efficient system reconfiguration, upgrades and growth.