Modelling and Performance Studies of ATM Networks Over Email & FTP

Modelling and Performance Studies of ATM Networks Over Email & FTP

Nurul I. Sarkar (Auckland University of Technology, New Zealand) and Kashif Nisar (Auckland University of Technology, New Zealand, & Universiti Utara Malaysia, Malaysia)
DOI: 10.4018/japuc.2012040102
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The Advanced Network Technologies is a research that investigates the technology(s) behind today’s modern networks and network infrastructures – one of these technologies being Asynchronous Transfer Mode (ATM); a technology commonly in place in networks all around the world today. Therefore, this paper focuses its attention on ATM. Dubbed “Modelling and Performance Studies of ATM Networks,” this research looks into the “impact of application segment length on the performance of an ATM network” and the “impact of traffic type data on the performance of an ATM network.” For this research, the authors have used the OPNET Modeler 14.0 Simulation software to create a network model that represents a real-life ATM network. By simulating an ATM network at AUT University New Zealand, the authors can change certain variables, and observe the effects the changes have on performance. As such, one of the impacts that will be explored is the effect that application segment length has on an ATM network. The second impact to be inspected is the impact of different traffic types on an ATM network. For example, Email traffic should theoretically affect an ATM network differently to the way that Voice traffic does. This way of thinking is what will be looked into further.
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1. Introduction

As stated in the abstract, this research deals with modelling an ATM network. To do this we used a piece of simulation software called OPNET Modeler 14.0. This application literally allows you to place such things as switches, servers, client workstations, etc., into a workspace and have them behave just as they would in real life. Hence this particular program is perfect for what we are trying to achieve in this research (Xiao, 2005; Floros, Avlonitis, & Vlamos, 2008; Yasukawa, Forte, & Schulzrinne, 2009; Wang & Zhuang, 2008; Leith, Clifford, Malone, & Ng, 2005; Li, Ni, Malone, Leith, Xiao, & Turletti, 2009).

As also stated earlier, our research on ATM model is based on the ATM model that we built in our research paper. The model is explained in-depth (Abusubaih, Wiethoelter, Gross, & Wolisz, 2008; Brian & Mark, 2007).

Figure 1 shows the high-level perspective of the ATM model that was produced in research Lab. The model consists of 8 main components: 2 central ATM cross connection switches, 4 subnets, an application config and a profile config.

Figure 1.

High level view of the ATM network model


As shown in Figure 1, the subnets are each connected to one of the cross connection switches (NorthWest & SouthWest to the CentralWest switch; SouthEast & NorthEast to the CentralEast switch). Both central switches are then connected to each other; utilising a total of 5 links altogether. These links are all full-duplex (bidirectional) ATM connection links. The application config “Applications” houses the definitions for all the applications that will be used in our model. In our research Lab ATM model three definitions have already been setup; these are definitions for Email, and FTP. The profiles config “Profiles” houses the rules and settings for applications. So in this case there will be four profiles – one for each application definition outlined in the application config.

Figure 2 shows the components and subsequent layout of the NorthWest subnet. Each of the subnets has identical components and layout as that of the Northwest subnet. Each has 2 ATM Data (Email & FTP) client workstations, a central ATM cross connection switch, and an ATM server. Each client is connected individually to the central switch; and so is the server. These links are also all full-duplex ATM connection links.

Figure 2.

Internal view of the “NorthWest” subnet


The central switch is then also connected to the network outside of the subnet. As stated each subnet is connected to a switch, so the central switch inside the subnet thus is connected to one of the central switches outside of the subnet (e.g., CentralWest switch). This connection is also made via a bidirectional ATM link. Thus, altogether, there are 8 links being utilised within a subnet


2. Node Configuration (Station, Switch, Server)

In this model, there are a total of 34 nodes. The categorical breakdown of them is as follows:

  • 8 Data clients

    • o

      2 per subnet

  • 8 Voice clients

    • o

      2 per subnet

  • 8 Video clients

    • o

      2 per subnet

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