The main objectives of traffic management in ATM networks are to protect the user and the network in order to achieve network performance objectives and to use the available resources in an efficient way. In order to achieve these objectives the profile of the cell stream of each connection needs to be described adequately by means of a set of traffic parameters, together with an indication of the required level of QoS. The relationship between network performance and traffic characteristics and QoS is structured by means of ATM layer Service Categories and Transfer Capabilities. Each Category/Capability is provided with a number of traffic congestion and traffic control mechanisms needed to guarantee the required QoS of the category while achieving a high level of efficiency. This paper presents a state-of-the-art of traffic management in ATM networks. An overview is given of the Service Categories, together with the most important control and congestion schemes: CAC, UPC, traffic shaping, priority control, resource management, flow control, packet discarding schemes.
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