The greatly variable requirements of different applications, particularly those of video and data sources, make high demands on the development of traffic control in ATM networks. Connection admission control is a traffic control function which requires knowledge of traffic behavior, switching architecture, etc. and its impact on Quality of Service (QoS). Development of CAC schemes depends on many factors and it is not possible to have one single universal method suitable for all instances. CAC method must be first verified, if it is suitable as traffic control in ATM node with specific input traffic behavior. In this paper the intensive and weak properties of three CAC methods are presented: Gaussian, effective bandwidth and diffusion approximation method.
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