One of the local area network medium access control standards created by the Institute of Electrical and Electronic Engineers in IEEE Project 802 is the carrier sense multiple access with collision detection (CSMA/CD) medium access control. Numerous studies have been reported in the literature on the performance of CSMA/CD. These studies show that CSMA/CD performs well under light network load but not well at heavy load. To improve the performance of CSMA/CD under heavy load, a new concept called network partitioning is presented. Network partitioning allows the network to be partitioned into segments when under heavy load. Partition stations then act as bridges between the segments. The impact of network partitioning on network performance was tested using a simulation model of an Ethernet local area network (an implementation of the CSMA/CD medium access control). The simulation results show that network partitioning can improve the performance of CSMA/CD under heavy load.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

STARNET is a fiber optic based network which facilitates the interconnection of distributed Local Area Networks. Configured as a sixteen pointed star topology with a multiprocessor based controller at the center of the star (named the Central Switch). STARNET is capable of scheduling calls from users connected to User Access Nodes located at the points of the star. Messages are passed from one node to another through the Central Switch via duplex fiber optic lines connecting each node to the center. / This paper presents a multiprocessor based design of the User Access Node. The hardware and software structure is examined in depth, providing solid guidelines for the physical construction of the unit. The performances of statistical STARNET models using parameters obtained from the design (and three different Central Switch models) are plotted and compared for five different examples of external traffic. The model analysis gives an indication of the expected message delays, supporting the feasibility of the design.

Thesis (M.S.)--Eastern Illinois University, 2009. / Includes bibliographical references (leaves 58-60).

Dissertation (MCIS - Computer and Information Sciences) -- AUT University, 2008. / Includes bibliographical references. Also held in print (ix, 65 leaves : ill. ; 30 cm.) in City Campus Theses Collection (T 621.385 WU)

M.Ing. / Recent traffic analyses have shown the existence of long-range dependencies in network traffic, specifically self-similar long-range dependencies. Due to the inability of traditional traffic models to capture these long-range dependencies, new network traffic models were developed that are able to capture it. In this paper we compare three self-similar long-range dependent traffic models, namely the FARIMA model, the wavelet independent Gaussian model and the multifractal wavelet model. We present results on their marginal distributions, their correlation matching to real traffic and their queuing behaviour. We show that the multifractal wavelet model is the best of the three models in all of the test aspects.

No description available.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Tests for missile defense systems are very complex, and present challenging issues for the extraction of target lethality data. Future tests will involve the use of multiple interceptors and targets with some of these assets following over-the-horizon (OTH) trajectories. The use of wireless local area network (WLAN) technologies for the acquisition of test data offers a novel approach to manage data bandwidths and link margins over-the-air (OTA) as functions of time and asset. Notional test scenarios are examined for the suitability of WLAN technologies to missile defense intercept testing.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In our prior work [1] we proposed that network-centric data telemetry systems offer substantial improvements over traditional serial data telemetry systems. This paper is a follow up to that work and is also a companion to our experimentation paper [2]. In network-centric telemetry systems, there can be many infrastructure sites that form the network’s ad hoc communications paths, and there can be many fast-moving nodes, e.g., munitions, which enter the network, generate telemetry data, and exit the network. As the geographic size of such data telemetry networks grows, constraints on link margin will typically preclude a one-to-one matching of ground-based infrastructure sites to airborne, fast-moving nodes. That is, the fast-moving nodes will traverse distances that will require the mobile node to change which specific ground node it communicates with to transfer telemetry data. This paper describes an analytic model for the generic process of a fast moving node entering a wireless network and the associated handoffs of that node among ground stations as the fast mover traverses the spatial region covered by the wireless network. Our analysis and associated worst-case example demonstrate that wireless networking technology can handle the stress of rapidly managing connectivity to high-speed nodes for effective telemetry data extraction.

No description available.