The controller area network (CAN) communications protocol is used extensively in the automotive and industrial control sectors, Much work has been done to establish the bounded response time of transmissions in an event-triggered CAN. However, a new time-triggered architecture for CAN is being developed and will soon be available on the market. This new control network, referred to as time-triggered controller area network, defines a session layer protocol for CAN, which is based on a static schedule time-triggered paradigm and provides intrinsic deterministic behaviour. This paper describes the new protocol and provides some practical performance equations to calculate utilisation limits for this control network. (C) 2002 Elsevier Science B.V. All rights reserved.