Talks and Poster Presentations (with Proceedings-Entry):
G. Bauer, T. Frenning, A.K. Jonsson, H. Kopetz, C. Temple:
"A Centralized Approach for Avoiding the Babbling-Idiot Failure in the time-Triggered Architecture";
New York, USA;
2000-06-01; in: "Proceedings of the ICDSN 2000",
A babbling-idiot - a node that transmits at random instants for an arbitrary duration - is one of the most serious failures in a distributed system, where nodes communicate by means of a multiaccess broadcast network. This is because a single babbling-idiot has the capability of preventing correct nodes from successfully exchanging messages.
In the "Time-Triggered Architecture" the communications media is arbitrated using a time-division multiple access (TDMA) scheme, a time multiplexing strategy with a statically scheduled periodic media access pattern. Since in TDMA based communication it is known a-priori when a subscriber is granted access to the communication media it is possible to build a supervisor unit preventing subscribers from sending messages outside of their assigned time slots, thus guarding against babbling-idiots.
In "Avoiding the babbling-idiot failure in a time-triggered communication system" an approach to build such a supervisor is presented: it is based on the idea to equip every subscriber with an independent additional unit - the bus guardian - that grants bus access to the respective subscriber during its assigned time slots.
However, when the physical network topology is changed from a bus topology to a star topology (which in some sense is only a very short bus) it is reasonable to introduce a central bus guardian that acts as a supervisor for all of the subscriber nodes at the star point of the network.
In the following we want to present the basic functionality of such a central bus guardian and discuss some of the properties that are related with this type of supervisor unit.
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.