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Chapter 4Simulation and analytical modelling pThe major data blocks are data structures and block diagrams. In order to build a modelin BONeS, one first defines a data structure that corresponds roughly to a message andits associated data field. The user then develops a block diagram that describes how thedata structures flow through the networks.The second language is SES/workbench, which is also a graphically-oriented, generalpurposesimulation language that contains many features for modelling computersystems and communications networks. The major building blocks are nodes, arcs andtransactions. To build a model in workbench, one defines a transaction that correspondsto a message. The user then develops a directed graph consisting of nodes and arcs,which describes how transactions flow through the network.The last simulation language is the OPtimised Network Engineering Tool (OPNET)Modeller. This software is a communication simulation language specially orientedtoward the modelling of communications networks that uses etwork, odes, andProcess Editors to build a simulation model.From these three simulation languages, OPNET Modeller (v6.0 [79]) has been used asthe simulation tool for the performance characterisation and optimisations of theDVB/DAVIC protocol because this simulation package contains an extensive set offeatures designed to support network modelling and provides an increased flexibility todevelop detailed custom models.4-2