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Title page
Approval Page
List of Acronyms
Table of Contents
List of figures
List of Tables

1.0 Introduction
1.1       Historical Background
1.2       Problem statement
1.3       Aims and objectives of the research
1.4       Scope of the research
1.5       Methodology
1.6       Thesis Outline

2.0       Introduction
2.1       Local Area Network
2.1.1    LAN protocol and the OSI model
2.1.2    LAN media access methods
2.1.3    LAN Transmission Method
2.1.4    LAN Topologies
2.1.5    Types of LAN Ethernet Fast Ethernet (IEEE 802.3u) Gigabit Ethernet (IEEE 802.3z) Token Ring Network (IEEE 802.5) Token Bus (IEEE 802.4)
2.2       Metropolitan Area Network
2.2.1 Fiber Distributed Digital Interface (IEEE 802.8)
2.2.2 Switched multimegabit data service (IEEE 802.6)
2.3       Wide Area Network
2.3.1 WAN Connection Technologies
2.3.1 Switched WAN Connection Technologies  Integrated service digital networks X.25 Frame Relay 4 Asynchronous Transfer Mode
2.4       Public Switched Telephone Networks (PSTNs)
2.4.1 PSTN Technologies
2.4.1 PSTN Systems
2.4.2 Public Telephone System Interconnection
2.4.1 PSTN Service
2.4       Resource Allocation Schemes in Public Data Network
2.5       Review Of Related Work
2.6       Conclusion

3.0 Introduction
3.1       Network Architecture
3.2       Physical Model
3.3       Analytical And Computer Simulation Model
3.4       conclusion

4.0       Introduction
4.1       Cell loss rate and Delay as a function Traffic Intensity for varying Buffer Capacity for Homogeneous Traffic Source
4.2       Cell loss rate and Delay as a function Traffic Intensity for varying Buffer Capacity for Heterogeneous Source (Data and Voice)
4.3       Cell loss rate and Delay as a function Traffic Intensity for varying Buffer Capacity for Heterogeneous Source (Data, Voice and Video)
4.4       Performance Analysis of the Network with respect to Cell Loss Rate and Traffic Intensity            at Buffer Capacity of 10
4.5.      Cell loss rate as a function of Buffer Capacity at varying Traffic Intensity for the different Traffic Source
4.6       Performance Analysis of the Network with respect to Cell Loss Rate and Buffer Capacity at a Traffic Intensity of 2.80E05

5.0       Conclusion
5.1       Observation
5.2       Recommendations


Asynchronous Transfer Mode (ATM) has been recommended and has been accepted by industry as the transfer mode for Broadband network. Currently, large scale effort has been undertaken both in the industry and academic environment to design and build high speed ATM networks for corporate bodies. These networks are meant to support both real-time and non-real time applications with different quality of service (QoS) requirements. The resources to support the applications QOS requirements are typically limited and therefore the need to dynamically allocate resource in a fair manner becomes inevitable. In this work, an evaluation is carried out on the performance of enterprise-wide network that its backbone is based on leased trunk. The performance of the leased trunk was evaluated when loaded with homogeneous and heterogeneous traffic. The evaluation was carried out in order to determine the exact effect of traffic overload on resources-trunk transmission capacity and buffer. The aim is to define the optimum loading level and the associated QoS parameter values. A typical network was adopted, modeled and simulated in MATLAB environment using Simulink tool and results obtained were analyzed using Microsoft Excel.



1.0 Introduction

Enterprise wide network also know as cooperate networks are private communication networks owned and run by enterprises. This kind of network provide communication platform for geographically separated site (offices) of an organization. The different offices of an enterprise could be within a locality, a state, a nation or distributed round all over the globe. An enterprise private network could also be seen as acomputer network built by a business to interconnect its various company sites (such as production sites, offices and shops) in order to share computer resources.’ Also and enterprise wide area network (WAN) is a corporate networkthat connects geographically dispersed users areas that could be anywhere in the world. Enterprise WAN links LANs in multiple locations. The enterprise in question often owns and manages the networking equipment within the LANs. However, the LANs are generally connected by a service provider through leased trunks thus providing connectivity to the geographically dispersed sites [1, 2].

Briefly we present an account of the key features of the current communication environment, namely the characterization of the communication services to be provided as well as the features and properties of the underlying communication network that is supposed to support the previous services.

1.1 Historical Background

The fundamental purpose of a communication system is to exchange information between two or more devices. Telecommunication has witnessed unprecedented and explosive growth overthe years in the area of services delivered and technology. The key parameters of telecommunication service cannot be easily identified, owing to the very different nature of the various services that can be envisioned. This is basically the reason for the rapidly change in the technological environment. In fact, a person living in the sixties, who faced the only provision of the basic telephone service and the first low-speed data services, could rather easily classify the basic parameters of these two services. The tremendous push in the potential provision of telecommunication services enabled by the current networking capability makes such classification harder year after year. In fact, not only are new services being thought and....

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