Queueing behavior under flow control at the subscriber-to-network interface for high speed metropolitan area networks

A credit manager algorithm (CMA) is introduced and used to control the flow of packets between a subscriber station (or a local area network) and the access to a high-speed metropolitan area network. The parameters of the algorithm are used to regulate the mean throughput and the level of burstiness at the subscriber-to-network interface (SNI). Simulation results are presented for the average system size at the SNI, representing the packet delays at the sender´s buffer. The regulated output traffic across the SNI is statistically characterized by categorizing its states into three modes; idle, burst, and restricted modes. Presented also is a model for the queueing behavior of an asynchronous transfer mode (ATM)-type system, where single segment packets (cells) are served. A numerical method is used to solve for the underlying system state probabilities