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Modelling a Video-on-Demand Service over an Interconnected LAN and ATM Networks

High speed networks employing ATM technology are becoming necessary as a result of increased traffic load and the transfer of multimedia information on computer networks. However, there is a large base of machines connected to local area networks (LANs) using Ethernet and FDDI technology. Thus, it is important for ATM networks and LANs to inter-operate. This paper gives an analysis of the performance issues of interconnected LAN and ATM networks under low and high load conditions, using two different scenarios. In particular, we simulate Video-on-Demand (VOD) traffic on the network and attention is given to analyse the end-to-end delays at each section of the entire network model. It is found that a severe bottleneck is over the Ethernet segment since congestion on the Ethernet bus arises as packets are routed into the Ethernet network. Otherwise, ATM technology provides a very efficient high speed data network.