Distributed CBO call set-up in a circuit emulation ATM switch

This paper deals with a fully distributed routing control scheme, called flooding technique, to be applied to an ATM switch architecture for the set-up of CBO calls. The main advantage of this technique with respect to a centralized solution consists in a sensitive improvement of the system performance, in particular as far as the fault-tolerance and the flexibility are concerned. Two service scenarios are considered: in the first one the CBO services are characterized by a burstiness equal to one, in the second one they have a burstiness greater than one. The implementation alternatives of the flooding technique relevant to both the scenarios are presented and their main characteristics arecompared. In the paper, the ATM switch architecture and its mode of operation are also described. In particular, the different strategies for the handling of CBO and non-isochronous classes of traffic are presented and some properties on the topology of the switching fabric are given.