There are 1 files which have been withheld at the author's request. Master of Science in Engineering - Engineering / Modelling of telecommunications access networks which concentrate traffic is essential for architectural studies, design and operational efficiency. This work develops the concept of an Intermediate Services Access Network (ISAN) that represents an enhanced narrowband synchronous transfer mode access network which provides an evolutionary step from the existing POTS and N-ISDN access networks to the Fibre to the x (FTTx) networks. Models of the ISAN are developed to support architectural and traffic studies. Generic components are identified from a study of several typical ISAN network architectures. The components include intelligent nodes, transmission links and exchange interfaces. The modelling methodology used seeks firstly to identify resources in the access network and then model them as object classes. Entity-Relationship diagram techniques, defined by the International Telecommunications Union, are used in this work to identify, decompose and represent components in an access network. Recurring components in this work are termed generic components and have attributes that make them reusable. The classes developed consist of generic classes, and technology or application specific classes. Software classes are developed to represent traffic sources with selectable parameters including Poisson arrivals, negative exponential or lognormal holding times and asymmetric originating and terminating models. The identified object classes are implemented using the object-oriented simulation language MODSIM III. An existing unidirectional ring network is simulated to quantify the traffic performance of this type of network under telephone traffic conditions. The ring network is further developed to enhance traffic capacity and performance under link failure conditions. As an economic consideration, this hypothetical ring network uses a single backup link in the event of link failure. The network is simulated with different types of types of traffic (telephone, payphone and Internet dial-up traffic) and under link failure conditions to establish the grade of service.

Context In the present world, there is an increase in the usage of the telecommunication networking services, as there is a need of efficient networking services in various fields which can be obtained by using the efficient networking components. For that purpose we have to know about the components parameters. One of the most important parameter is the energy usage of networking components. Therefore, there is a need in power profiling of the network switches. Objectives The objective of this research is to profile the power usage of different network components(Switches) for various load scenarios. Power measurements are done by using the open energy monitoring tool called emonpi. Methods The research method has been carried out by using an experimental test bed. In this research, we are going to conduct the experiments with different configurations to obtain different load conditions for sources and destinations which will be passed through DUT(Device Under Test). For that DUT’s we will measure power usage by monitoring tool called emonpi. Then the experiments are conducted for different load scenarios for different switches and results are discussed. Conclusion From the results obtained, the Power profiles of different DUT’s are tabulated and analyzed. These were done under different ports and load scenarios for Cisco2950, Cisco3560 and Netgear GS-724T. From the results and analysis it can be stated that the power usage of Cisco 2950 is having the maximum power usage in all the considered scenarios with respect to packet rate and also number of active ports. The Netgear-GS724T is having the minimum power usage from the three switches as it having the green switch characteristics in all scenarios. And the Cisco 3560 is in between the above two switches as it is having energy efficient management from Cisco. From this we have proposed a simple model for energy/power measurement.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / A large selection of hardware and software components are readily available for supporting Internet communication in the ground network environment. These components can be used to construct very powerful and flexible communication systems. The Operating Missions as Nodes on the Internet (OMNI) project at NASA/GSFC has been defining and demonstrating ways to use standard Internet technologies for future space communication. Theses concepts and technologies are also applicable to test range telemetry applications. This paper identifies the network equipment and protocols to support end-to-end IP communication from range sensors and spacecraft instruments to end users. After identifying the end-to-end network hardware and software components, the paper discusses which ones are currently available and lists specific examples of each. This includes examples of space missions currently using Internet technology for end-to-end communication. It also lists missing pieces and includes information on their current status. The goal of this paper is also to stimulate thought and discussion on what steps need to be taken to start filling in the remaining missing pieces for end-to-end range and space network connectivity.