On-board B-ISDN fast packet switching architectures. Phase 1: Study

The broadband integrate services digital network (B-ISDN) is an emerging telecommunications technology that will meet most of the telecommunications networking needs in the mid-1990's to early next century. The satellite-based system is well positioned for providing B-ISDN service with its inherent capabilities of point-to-multipoint and broadcast transmission, virtually unlimited connectivity between any two points within a beam coverage, short deployment time of communications facility, flexible and dynamic reallocation of space segment capacity, and distance insensitive cost. On-board processing satellites, particularly in a multiple spot beam environment, will provide enhanced connectivity, better performance, optimized access and transmission link design, and lower user service cost. The following are described: the user and network aspects of broadband services; the current development status in broadband services; various satellite network architectures including system design issues; and various fast packet switch architectures and their detail designs

Sistema de comunicaciones tierra-tierra mediante anillo de fibra óptica entre emplazamientos de navegación aérea

El proyecto que se expondrá a continuación trata de dar solución a los requisitos especificados por el cliente principal, basados en el diseño e instalación de un sistema de comunicaciones mediante fibra óptica entre los distintos emplazamientos de navegación aérea existentes dentro de un aeropuerto. Dentro de un complejo aeroportuario existen distintos emplazamientos que albergan ayudas para navegación aérea, y es imprescindible la comunicación entre todos. Dentro de ellos se encuentra la Torre de Control desde donde se controlan y gestionan todas las operaciones de las aeronaves. También forman parte los diferentes emplazamientos que dan soporte al aterrizaje, despegue y navegación. Se realizará una revisión de todas las tecnologías de comunicaciones existentes, como son las basadas en multiplexación de la frecuencia, tiempo y longitud de onda. También los protocolos de comunicaciones como pueden ser SNMP (Protocolo Simple de Gestión de Red), TCP (Protocolo de Control de Transporte), IP (Protocolo de Internet) y Ethernet. Para dar solución al presente proyecto, se utilizará SDH (Jerarquía Digital Síncrona) como principal tecnología. Sobre SDH se pueden destacar mejoras en la velocidad de transmisión, mayor fiabilidad con mecánicos automáticos de protección ante fallos y gran capacidad de ampliación en el futuro. El diseño y ejecución del proyecto se llevará a cabo cumpliendo unas directrices comunes, que responden a unos estándares de gestión de proyectos, mediante herramientas como el diagrama de tiempos de ejecución del proyecto, normativas de seguridad, informes de seguimiento, etc. Por último, se obtendrán las conclusiones finales técnicas de cara a la mejora en futuros proyectos que se realicen en similares condiciones.This project is a solution to the specified requirements by the primary client, based on the design and installation of a fiber optic communication between different air navigation sites in an airport. Inside an airport there are many sites that have air navigation aids and the communication is essential between them. The Control Tower is the principal site where you can control and manage all aircraft operations. Also includes various sites that support the landing, takeoff and navigation. A revision of the existing communication technologies will be provided, such as those based on frequency, time and wavelength division multiplexing. Also the communications protocols such as SNMP (Simple Network Management Protocol), TCP (Transport Control Protocol), IP (Internet Protocol) and Ethernet. To solve this project, SDH (Synchronous Digital Hierarchy) has been used as the main technology in this project. Regarding SDH, it can be highlighted improvements in transmission speed, higher reliability with automatic mechanical failure protection and highly scalable in the future. Design and implementation will be carried out in compliance with standard guidelines, which meet standards of project management, using tools such as the timing diagram, safety regulations, monitoring reports, etc. Finally, technical conclusions for the enhancement in future project carried out in similar conditions, will be obtained.Ingeniería Técnica en Sistemas de Telecomunicació

Internet performance modeling: the state of the art at the turn of the century

Seemingly overnight, the Internet has gone from an academic experiment to a worldwide information matrix. Along the way, computer scientists have come to realize that understanding the performance of the Internet is a remarkably challenging and subtle problem. This challenge is all the more important because of the increasingly significant role the Internet has come to play in society. To take stock of the field of Internet performance modeling, the authors organized a workshop at Schloß Dagstuhl. This paper summarizes the results of discussions, both plenary and in small groups, that took place during the four-day workshop. It identifies successes, points to areas where more work is needed, and poses “Grand Challenges” for the performance evaluation community with respect to the Internet

Campus Communications Systems: Converging Technologies

This book is a rewrite of Campus Telecommunications Systems: Managing Change, a book that was written by ACUTA in 1995. In the past decade, our industry has experienced a thousand-fold increase in data rates as we migrated from 10 megabit links (10 million bits per second) to 10 gigabit links (10 billion bits per second), we have seen the National Telecommunications Policy completely revamped; we have seen the combination of voice, data, and video onto one network; and we have seen many of our service providers merge into larger corporations able to offer more diverse services. When this book was last written, A CUT A meant telecommunications, convergence was a mathematical term, triple play was a baseball term, and terms such as iPod, DoS, and QoS did not exist. This book is designed to be a communications primer to be used by new entrants into the field of communications in higher education and by veteran communications professionals who want additional information in areas other than their field of expertise. There are reference books and text books available on every topic discussed in this book if a more in-depth explanation is desired. Individual chapters were authored by communications professionals from various member campuses. This allowed the authors to share their years of experience (more years than many of us would care to admit to) with the community at large. Foreword Walt Magnussen, Ph.D. Preface Ron Kovac, Ph.D. 1 The Technology Landscape: Historical Overview . Walt Magnussen, Ph.D. 2 Emerging Trends and Technologies . Joanne Kossuth 3 Network Security . Beth Chancellor 4 Security and Disaster Planning and Management Marjorie Windelberg, Ph.D. 5 Student Services in a University Setting . Walt Magnussen, Ph.D. 6 Administrative Services David E. O\u27Neill 7 The Business Side of Information Technology George Denbow 8 The Role of Consultants . David C. Metz Glossary Michelle Narcavag

Sistemas de videoconferencia sobre redes RDSI, ATM, Ethernet/IP, Frame Relay y redes celulares móviles

Enmarcada entre los servicios de las comunicaciones multimedia, la videoconferencia es un servicio digital de telecomunicaciones multimedia para el intercambio de información audiovisual entre dos o más sitios geográficamente distantes, mediante la transmisión y recepción bidireccional simultánea de audio, video datos de los participantes. Los desarrollos que ha sufrido la videoconferencia han permitido un uso muy sencillo y una fiabilidad en las comunicaciones sobre cualquier infraestructura de red. Tal es así, que estas comunicaciones pueden desarrollarse tanto sobre RDSI como sobre redes ATM, Ethernet, Frame Relay e incluso redes móviles. Sin embargo, para poder implementar un sistema de videoconferencia en una determinada red con los requisitos mínimos que esta exige, es necesario un estudio anticipado de todos los parámetros y recomendaciones a tener en cuenta para su correcto funcionamiento.Incluye bibliografí

NASA Tech Briefs, July 1996

Topics covered include: Mechanical Components; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery/Automation; Manufacturing/Fabrication; Mathematics and Information Sciences; Life Sciences; Books and Report

Implementación de una empresa que brinde el servicio de educación a distancia por internet en Nicaragua

Tesis (Ingeniero en Sistemas)--Universidad Americana, Managua, 2004Este estudio evalúa la factibilidad de establecer una empresa que brinde el servicio educación a distancia por Internet en Nicaragua que facilite a la comunidad estudiantil recibir los cursos o clases que demande para alcanzar sus metas educativas y/o profesionales

Data Driven Network Design for Cloud Services Based on Historic Utilization

In recent years we have seen a shift from traditional networking in enterprises with Data Center centric architectures moving to cloud services. Companies are moving away from private networking technologies like MPLS as they migrate their application workloads to the cloud. With these migrations, network architects must struggle with how to design and build new network infrastructure to support the cloud for all their end users including office workers, remote workers, and home office workers. The main goal for network design is to maximize availability and performance and minimize cost. However, network architects and network engineers tend to over provision networks by sizing the bandwidth for worst case scenarios wasting millions of dollars per year. This thesis will analyze traditional network utilization data from twenty-five of the Fortune 500 companies in the United States and determine the most efficient bandwidth to support cloud services from providers like Amazon, Microsoft, Google, and others. The analysis of real-world data and the resulting proposed scaling factor is an original contribution from this study

Una herramienta de gestión de redes virtuales

154 páginas. Maestría en Ciencias de la Computación.En el trabajo de tesis se desarrolla una Herramienta de Gestión de Redes Virtuales con el fin de monitorear, configurar/reconfigurar VLAN’s, consta de varios módulos tales como: SNMP GET, SNMP SET, SNMP GETNEXT, MONITOREO, SNMP visualizador y estadísticas de red. La herramienta es gratuita y de libre uso por parte de la comunidad de redes versus las herramientas propias de cada proveedor de VLAN, que valen de cientos a miles de pesos. Los módulos de la herramienta de Gestión de Redes Virtuales pueden trabajar de forma local o remota, a través de la pila de protocolos TCP/IP (Transfer Control Protocol/Internet Protocol). El protocolo que se emplea para acceder a las bases de datos de configuración de los equipos o nodos, es el protocolo de administración simple de red, basado en UDP (User Datagram Protocol), SNMP (Simple Network Management Protocol), los puertos en uso son el 160 y 161 que son los que permiten el envío y recepción de información entre la estación de administración y la estación administrada. Para analizar la red: a) se capturan los paquetes de datos; b) se desencapsula el paquete en los elementos de interés para el análisis de red y finalmente se presenta la información en pantalla, por lo que es posible capturar: Paquetes, cuyo origen o destino sea un host determinado. Paquetes, cuya dirección origen o destino corresponda a una red determinada. Paquetes, cuyo puerto de origen sea algún número de puerto. Paquetes, TCP, UDP y los puertos correspondientes. Paquetes, cuya dirección destino corresponda a una red determinada. Cualquier combinación de los anteriores. El desarrollo modular de la herramienta permite que la integración de nuevos módulos, que brinda nuevas funcionalidades, sea flexible sin afectar a los que ya están en función, por mencionar un ejemplo: El módulo de seguridad SSH (Security Shell) y el módulo de Cortafuegos, para la seguridad de la información que se extrae de los equipos y del análisis de red. Información adicional acerca del detalle de la herramienta de gestión de redes virtuales se encuentra en el desarrollo capitular de la tesis.The thesis to provide a tool for monitoring, configuration or reconfiguration of VLANs through software. The tool has several modules, such as: SNMP GET, SNMP SET, SNMP GETNEXT, MONITOR, SNMP VIEWER and NETSTATISTICS. The porpuse was made a tool free, because each vendor has developed its own proprietary VLAN product. The parts of the tool, modules, work in local and remote environments. Tha tool use the TCP/IP and UDP protocols for analizing traffic statistics of the network. There is a protocol called SNMP (Simple Network Management Protocol), the protocol is used to manage, monitor and configurate nodes in local or remote form. The protocol use the ports 160 and 161 to communicate information about nodes confgurations. For analizing the network the tool capture frames and dispaly information about network performance, the tool provide filtering, security and traffic flow management, for example: a) Capture frames about a particular node. b) Capture frames about a particular network. c) Capture frames with a particular evaluation criteria. d) Whatever criteria. The tool can enhance modular scalability, security, and network management without problem. The modular architecture permit to increase modules for security, for example a firewall or SSH protocol, so, the information from nodes will be protected. Therefore, the tool is flexible due to simplify task when additions, moves or changes to the architecture are necessary. Additional Information is given in the structure of the thesis which is divided in several chapters