Abstract:This paper presents a balancing admission mechanism of wide band and narrow band calls in ATM networks. The combination of the mechanism with CAC can guarantee the fair admission of all kinds of calls. This paper also analyzes the probabilities of wide band calls blocking the narrow band calls in ATM networks under the mechanism when the traffic approaching to the system capacity. The analysis exposes that the proposed balancing mechanism can avoid the phenomena of one kind calls blocking the other kind calls. The result of the analysis is helpful for choosing a reasonable call admission and call refusing policy in practice.