SUMMARYWe consider an ADSL access network consisting of subscribers, digital subscriber line access multiplexers (DSLAMs), metro Ethernet switches and a broadband remote access aggregation server (BRAS). We obtain expressions for dimensioning the access network in the upstream direction. Specifi cally, we show that the bandwidth required at each DSLAM, metro Ethernet switch, and BRAS can be expressed as an exponential function of the subscribers in a log scale when the number of subscribers does not surpass a certain value. After this value, it grows linearly as a function of the subscribers.

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Broadband ATM networks at multi-megabit data rates will provide the necessary bandwidth for highquality interactive video applications. Performance requirements for high quality video services are introduced. Results of statistical simulations of broadband networks transmitting video signals are shown to demonstrate that VBR coding provides gains in multiplezed channel utilization and in BISDN link capacity.Issues relating to protocol design for ATM networks, particularly congestion control and error control are introduced. Finally various techniques for handling cell loss are compared.