This book presents recent and original state of the art research contributions relating to the modelling and performance of high speed multimedia networks Special emphasis is given to ATM networks It discusses common problems encountered from the design of switch architectures to high performance protocol implementation The book is divided into eight parts which explore the following topics This is the sixth conference in the series which started in 1981 in Paris followed by conferences held in Zurich 1984 Rio de Janeirio 1987 Barcelona 1991 and Raleigh 1993 The main objective of this IFIP conference series is to provide a platform for the exchange of recent and original contributions in communications systems in the areas of performance analysis architectures and applications There are many exiciting trends and developments in the communications industry several of which are related to advances in Asynchronous Transfer Mode ATM multimedia services and high speed protocols It is commonly believed in the communications industry that ATM represents the next generation of networking Yet there are a number of issues that has been worked on in various standards bodies government and industry research and development labs and universities towards enabling high speed networks in general and ATM networks in particular Reflecting these trends the technical program of the Sixth IFIP W G 6 3 Conference on Performance of Computer Networks consists of papers addressing a wide range of technical challenges and proposing various state of the art solutions to a subset of them The program includes 25 papers selected by the program committee out of 57 papers submitted This volume presents recent and original research relating to the modeling and performance of high speed multimedia networks in general and ATM networks in particular It addresses problems encountered from the design of switch architectures to high performance protocol implemen