this book constitutes the refereed proceedings of the 1996 international zurich seminar on digital communications, izs96, held in zurich, switzerland, in february 1996 and focusing on broadband communications.the 26 revised papers were selected from a total of some 70 submissions and give a snapshot of the state of the art in broadband communications. the book is divided into sections on broadband network architectures, designing for quality of service guarantees, protocol support for multimedia/multipoint services, traffic modeling and performance evaluation, fairness in resource allocation, applications, server functions in atm, satellite and wireless networks, broadband access and switching, and acceptance and congestion control.