Future benefits and applications of intelligent on-board processing to VSAT services

The trends and roles of VSAT services in the year 2010 time frame are examined based on an overall network and service model for that period. An estimate of the VSAT traffic is then made and the service and general network requirements are identified. In order to accommodate these traffic needs, four satellite VSAT architectures based on the use of fixed or scanning multibeam antennas in conjunction with IF switching or onboard regeneration and baseband processing are suggested. The performance of each of these architectures is assessed and the key enabling technologies are identified

Technology Directions for the 21st Century

New technologies will unleash the huge capacity of fiber-optic cable to meet growing demands for bandwidth. Companies will continue to replace private networks with public network bandwidth-on-demand. Although asynchronous transfer mode (ATM) is the transmission technology favored by many, its penetration will be slower than anticipated. Hybrid networks - e.g., a mix of ATM, frame relay, and fast Ethernet - may predominate, both as interim and long-term solutions, based on factors such as availability, interoperability, and cost. Telecommunications equipment and services prices will decrease further due to increased supply and more competition. Explosive Internet growth will continue, requiring additional backbone transmission capacity and enhanced protocols, but it is not clear who will fund the upgrade. Within ten years, space-based constellations of satellites in Low Earth orbit (LEO) will serve mobile users employing small, low-power terminals. 'Little LEO's' will provide packet transmission services and geo-position determination. 'Big LEO's' will function as global cellular telephone networks, with some planning to offer video and interactive multimedia services. Geosynchronous satellites also are proposed for mobile voice grade links and high-bandwidth services. NASA may benefit from resulting cost reductions in components, space hardware, launch services, and telecommunications services

Paying for high speed networking services

The idea of a free network is a myth of the past. Networking costs are expected to remain a burden to future IT budgets, no doubt raising questions regarding the payment of such services. Users do not normally pay to use local area networks, as companies tend to own their LANs. However, when wide area or international networks are considered, the situation is different. It is argued that in these cases the invoicing and payment system should be integral to the network's communication protocol. This implies changes to the networking protocol (to handle invoicing) as well as a new look at customary ideas of representing currency (to handle payment). In this dissertation, an invoicing and payment scheme that uses electronic cash and is implemented as part of the basic ATM protocols is discussed. The main advantages of this scheme can be summarized as a low administrative overhead and user privacy.Computer ScienceM. Sc. (Computer Science

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

Application of Asynchronous Transfer Mode (Atm) technology to Picture Archiving and Communication Systems (Pacs): A survey

Broadband Integrated Services Digital Network (R-ISDN) provides a range of narrowband and broad-band services for voice, video, and multimedia. Asynchronous Transfer Mode (ATM) has been selected by the standards bodies as the transfer mode for implementing B-ISDN; The ability to digitize images has lead to the prospect of reducing the physical space requirements, material costs, and manual labor of traditional film handling tasks in hospitals. The system which handles the acquisition, storage, and transmission of medical images is called a Picture Archiving and Communication System (PACS). The transmission system will directly impact the speed of image transfer. Today the most common transmission means used by acquisition and display station products is Ethernet. However, when considering network media, it is important to consider what the long term needs will be. Although ATM is a new standard, it is showing signs of becoming the next logical step to meet the needs of high speed networks; This thesis is a survey on ATM, and PACS. All the concepts involved in developing a PACS are presented in an orderly manner. It presents the recent developments in ATM, its applicability to PACS and the issues to be resolved for realising an ATM-based complete PACS. This work will be useful in providing the latest information, for any future research on ATM-based networks, and PACS

Sistem Komunikasi Dan Layanan Multimedia Menggunakan Jaringan Serat Optik Dan ATM

Hampir setiap jaringan dalam dunia komunikasi saar ini hanya menyediakan layanan yang bersifat spesifik saja, seperti jaringan telepon, video dan jaringan komunikasi data Sementara itu layanan jasa komunikasi semakin menuntut adanya perubahan kearah peningkatan kualitas dan keragaman jenis layanan yang dapat ditawarkan melalui suatu jaringan Sehingga dimasa depan, jaringan komunikasi dituntut untuk dapat mengirimkan informasi dengan super cepat serta dapat menggabungkan berbagai macam jaringan yang telah ada Melihat kebutuhan komunikasi di atas, diajukanlah sebuah ide tentang sistem komunikasi yang menggunakan jaringan serat optik dan A TM yang dapat menyediakan layanan multimedia dan dapat menyalurkan informasi dengan cepat. Dalam tugas akhir ini akan dibahas mengenai sistem komunikasi dan layanan multimedia yang menggunakan jaringan serat optik dan A TM sebagai penunjangnya. Sistem komunikasi multimedia berbasis A TM yang akan dibahas adalah suatu jaringan terintegrasi yang mempunyai kemampuan menyediakan jaringan broadband untuk aplikasi multimedia masa depan, serta dapat menggabungkan jaringan broadband akses kabel, jaringan akses tanpa kabel (wireless) dan jaringan transport regional. Aplikasi multimedia menyatukan berbagai media seperti audio, video, image, grafik, teks dan data. Layanan yang dapat tersedia melalui jaringan ini adalah layanan komunikasi broadband seperti commumty antenna TV (CATV), video on demand (VOD), home shoppmg, TV conferencmg, distance learning serta komunikasi data kecepatan tinggi dan lain-lain. Permasalahan yang dihadapi dalam menerapkan aplikasi multimedia pada jaringan adalah terbatasnya bandwidth serta kecepatan transmisi pada jaringan yang ada pada saat ini Disamping itu juga diperlukan sistem s'vitcbing dan transrnisi kecepatan tinggi, reliabilitas tinggi dan BER yang rendah. Penggunaan kabel serat optik sebagai media transmisi merupakan pilihan yang tepat bagi sistem komunikasi masa depan karena keunggulan-keunggulan yang dimilikinya Dan A TM (Asynchronous Transfer Mode) telah direkomendasikan oleh CCITT sebagai alat transport bagi BISON (Broadband Integrated Service Digital Network) yang dirancang untuk menyediakan layanan trafik multimedia, karena kecepatan transmisi ATM dapat mencapai !55 Mbit/s. ATM merupakan teknik switching dengan orientasi paket dan multipleksing yang menggunakan sel-sel dengan ukuran tetap (53 byte) yang disebut dengan ATM cel

From diversity to convergence : British computer networks and the Internet, 1970-1995

The Internet's success in the 21st century has encouraged analysts to investigate the origin of this network. Much of this literature adopts a teleological approach. Works often begin by discussing the invention of packet switching, describe the design and development of the ARPANET, and then examine how this network evolved into the Internet. Although the ARPANET was a seminal computer network, these accounts usually only briefly consider the many other diverse networks that existed. In addition, apart from momentary asides to alternative internetworking solutions, such as the Open Systems Interconnection (OSI) seven-layer reference model, this literature concentrates exclusively on the ARPANET, the Internet, and the World Wide Web. While focusing on these subjects is important and therefore justified, it can leave the reader with the impression that the world of networking started with the ARPANET and ended with the Internet. This thesis is an attempt to help correct this misconception. This thesis analyses the evolution of British computer networks and the Internet between the years 1970 and 1995. After an introduction in Chapter 1, the thesis analyses several networks. In Chapters 2 and 3, the focus is on academic networks, especially JANET and SuperJANET. Attention moves to videotex networks in Chapter 4, specifically Prestel, and in Chapter 5, the dissertation examines electronic mail networks such as Telecom Gold and Cable & Wireless Easylink. Chapter 6 considers online services, including CompuServe, American Online, and the Microsoft Network, and the thesis ends with a conclusion in Chapter 7. All of the networks discussed used protocols that were incompatible with each other which limited the utility of the networks for their users. Although it was possible that OSI or another solution could have solved this problem, the Internet's protocols achieved this objective. This thesis shows how the networks converged around TCP/IP