This paper conskiers preventive load control in ATM networks. A one link performance evaluation based on onloff trafic sources is carried out. Approximative modek are derive4 and a specific admksion control algorithm based on one of the modeh is presented and the obtained transfer eficiency is derived. A Flow Enforcement function to supervise each connection is suggested and the correspondence between modelling parameters, flow enforcement parameters and parameters used by the admission control algorithm is considered

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