Fault Handling in the Time-Triggered Architecture

The Time-Triggered Architecture (TTA) is a distributed computer architecture for the implementation of highly dependable real-time systems. The core building block of the TTA is the Time-Triggered Protocol (TTP), a communication protocol specifically designed for safety-critical fault-tolerant applications in the automotive and aerospace industry. A TTA system has fault tolerance implemented in both hardware and software. Whereas the hardware relies on redundant nodes and duplicated communication channels, the software uses algorithms that control such basic services as membership agreement, clique avoidance, and clock synchronization. Fault tolerance is dependent on the network topology used.

A TTA system consists of a set of TTA nodes connected by a replicated interconnection network. Each TTA node comprises a host computer, a communication network interface (CNI) and a communication controller with two bi-directional communication ports. Each of these ports is connected to an independent channel of the dual-channel interconnection network. The CNI is an interface between the application layer and protocol layer of a TTA node, with the TTP protocol running on the TTP communication controller and applications running on the host subsystem. All nodes communicate via these channels using the service of the communication controller that executes the time-triggered communication protocol TTP.

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