Showing papers on "Broadband networks published in 1982"

Increasing capacity of baseband digital data communication networks

Abstract: This invention provides broadband network capabilities for baseband digital collision detection transceiver equipment for communication between a plurality of data stations by affording simultaneous transmission of multiple channels over a broadband pass transmission link such as a coaxial cable. Thus, a fundamental carrier wave is transmitted on said link, received at local data stations and used to detect signals on different baseband channels for reception. For transmission the carrier wave typically is used for segregating a plurality of at least two transmission channels into typically single sideband upper and lower pass bands of baseband bandwidth capability adequately separated with guard bands to permit simple separation for receiving by means of pass band filters, etc.

Integrated Services Networks

Abstract: Title of Dissertation: Fast Evaluation and Dynamic Control of Integrated Services Networks Ibrahim Matta, Doctor of Philosophy, 1995 Dissertation directed by: Associate Professor Udaya Shankar Department of Computer Science Integrated services networks, such as ATM (Asynchronous Transfer Mode) networks, are expected to operate at gigabit per second rates and provide various virtual-circuit and datagram services. For this purpose, new control algorithms (e.g. scheduling, admission, routing) have been proposed. The algorithms are often adaptive, resulting in complex time-dependent interactions. This renders traditional evaluation tools ine ective; analytical approaches are typically too coarse, and simulation approaches are often too expensive. The goal of our research is to develop accurate analytical models that account for the interaction and time-dependent nature of the control algorithms, while at the same time being inexpensive or easy to solve. This would allow the rapid and tractable evaluation of di erent design alternatives. In this dissertation, we develop both dynamic models and quasi-static models of integrated networks. Dynamic models can be used to evaluate both virtual-circuit and datagram services. We solve dynamic models using a new iterative method, referred to as the Z-iteration. Our method is both accurate and fast. It permits the joint evaluation of various scheduling, admission, and routing schemes used in integrated networks. We show results comparing dynamic routing schemes on a network with NSFNET-backbone topology. We also illustrate the applicability of the Z-iteration to other high-performance systems. Quasi-static models are suitable for evaluating datagram services for which the quasi-static assumption is reasonable. We analyze a quasi-static model of a datagram network o ering di erent classes of service. We apply the Liapunov function method to derive stability conditions for the routes of the di erent tra c classes. We show how with scheduling support for routing, the routes of the tra c classes can be isolated, thereby improving the overall network performance. Fast Evaluation and Dynamic Control of Integrated Services Networks