Analytical modeling and performance of dual-bus high-speed networks under the Adaptive Cycle Cell Insertion (ACCI) protocol

Adaptive Cycle Cell Insertion (ACCI) is a MAC protocol which has been introduced by Baiocchi et al. in 1990. It was designed for use in high-speed (broadband) MANs utilizing a dual-bus topology and to be compatible for operation in an ATM environment. The performance evaluation of ACCI has been provided in terms of simulations; in addition, the mean access delay was evaluated only for the case of single cells. We present in this paper an analytical model to estimate the average frame delays in a dual-bus network operating under the ACCI protocol. Moreover, the model incorporates the case where the number of cells in a frame is given by a general, positive integer, random variable. Results for several different traffic patterns are presented and the accuracy of the analytical estimates for frame delays at arbitrary stations is compared with simulations.