DOWNLOAD MY Ph.D Thesis - UNAM

Chapter 4Simulation and analytical modelling p4.3.1 DVB/DAVIC network descriptionThe DVB/DAVIC simulation model uses a similar network topology as proposed byNarayanaswamy [77] for the CSF. This network topology is presented in Figure 4.3a. Itconsists of two logical buses (upstream and downstream) and Network Interface Units(subscribers) which are connected to the upstream and downstream channels tocommunicate with the Interactive Network Adaptor (HE). It also contains an INAmodule, which processes upstream data, evaluates upstream requests and sends data andsignalling information to all NIUs listening downstream.The corresponding representation into an OPNET model is as illustrated in Figure 4.3b.Several network models were created containing different number of nodes (rangingfrom 6 to 700 nodes), according to the performance analysis addressed.a) Network Topology b) OPNET Network ModelDownstream channelStatsCollectionINA NIU NIU NIUn1n6INAUpstream channelNetwork CloudFigure 4.3 – Network topology.4-7