Internet access standards: dissemination of the Integrated Services Digital Network in Spain, 1984-2005

This article aims to narrate the birth and evolution of the Integrated Services Digital Network (ISDN) in Spain with an essentially descriptive methodology, from an interdisciplinary perspective and from varied sources. The study aims to investigate the forms of the transition from a conceptual or engineering phase to the market in a standard of Internet access and, at the same time, in the different patterns of technological innovation and the factors that motivate them. It tries to verify if the own nature of the techniques, the degree of diffusion of the previous technologies, the technological level -digitalization- and the structure of market of the telecommunications — continued existence of the monopoly of the historical operator National Telephone Company of Spain — had a significant impact on the inequality of penetration with respect to other countries. The research authorizes to conclude that a very heterogeneous combination of factors caused that leading countries in the diffusion of a technology did not achieve that leading role in the diffusion of other technologies

VoIP: The Convergence of networks

The development of telecommunications, especially of the Internet, has made possible the use of technologies such as IP (Internet Protocol) telephony for both business and leisure. The problems arising from the diversity in number of existing telecommunication nets are motivating the study of systems to promote the homogenisation of means of voice and data transport. This paper presents the VoIP (voice over Internet Protocol) solution as a likely solution for this problem. It also develops a first approach to the concept and terminology of net convergence, and later, it establishes a comparison between IP telephony and conventional telephony. The paper also supplies a detailed analysis of requirements of IP telephony, of its legal situation and of the different standards used in its development

An overview of the Copernicus C4I architecture

The purpose of this thesis is to provide the reader with an overview of the U.S. Navy's Copernicus C4I Architecture. The acronym "C4I" emphasizes the intimate relationship between command, control, communications and intelligence, as well as their significance to the modern day warrior. Never in the history of the U.S> Navy has the importance of an extremely flexible C4I architecture been made more apparent than in the last decade. Included are discussions of the Copernicus concept, its command and control doctrine, its architectural goals and components, and Copernicus-related programs. Also included is a discussion on joint service efforts and the initiatives being conducted by the U.S. Marine Corps, the U.S. Air Force and the U.S. Army. Finally, a discussion of the Copernicus Phase I Requirements Definition Document's compliance with the acquisition process as required by DoD Instruction 5000.2 is presented.http://archive.org/details/overviewofcopern00dearLieutenant, United States NavyApproved for public release; distribution is unlimited

Building China's high-tech telecom equipment industry : a study of strategies in technology acquisition for competitive advantage

Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning; and, (S.M.)--Massachusetts Institute of Technology, Technology and Policy Program, 2001.Includes bibliographical references (p. 171-175).Over the past decade, China has witnessed a rapid growth in its information and communications technology (ICT) sector. The subject of this thesis specifically focuses on the telecommunications infrastructure equipment industry in China. This sector is an interesting one to study given that some of the leading domestic companies have mostly emphasized developing their own capabilities in product development, rather than calling upon formal technology transfers through foreign direct investment (FDI) initiatives. A significant challenge faced by local firms, however, is that foreign equipment manufacturers possessing deeper technological resources dominate their domestic market. Nevertheless, Chinese enterprises have recently begun producing high-end equipment such as core/backbone routers and DWDM optical transmission systems. The basic question this thesis seeks to answer, therefore, is how can Chinese companies become technologically competitive within the high-end segments of the telecom equipment market? A case study methodology was used to address this question, focusing on two leading domestic firms: Huawei Technologies, a privately owned company, and ZTE Corporation (Zhongxing), a state-owned enterprise. The findings show that four factors have contributed to the competitiveness of domestic firms. Firstly, they are able to successfully leverage the configurational nature of communications technology. Secondly, the substantial investment made by the case study firms to develop their own R&D capabilities has enabled them to become 'close followers' of the world technological frontier. Thirdly, the global trend towards a less vertically integrated equipment industry has produced a base of suppliers from which Chinese firms can procure world-class component and subsystem technologies. Lastly, the role of the Chinese government has been instrumental in building technological capabilities at the national level and expanding market demand. Reciprocal arrangements and performance requirements established between government and domestic firms have encouraged the latter to upgrade their technological capabilities. These combined observations provide a perspective on firm competitiveness in high tech industries that is somewhat different to the models proposed under 'second mover advantage' theory. Furthermore, the analyses made of technology acquisition at the level of the firm highlight the importance of independent development (where possible), compared to FDI, as a vehicle for technological development within late industrializing economies.by Aleyn Smith-Gillespie.S.M.M.C.P

Modelling and evaluation of load and performance control mechanisms of B-ISDN/ATM switching systems

Behandelt wird die Problematik der Last- und Leistungsregelung im Kontext der ATM-basierten Breitband-Vermittlungstechnik.Objective of this thesis are load control and performance control concepts for broadband switching systems. Focus is the services integrating network technology B-ISDN using ATM as transfer mode. The studied mechanisms and concepts are principally of generic nature. Specifically they are designed within the envisaged context of B-ISDN, due to its extensive vision with respect to service integration, Quality of Service (QoS) support and ATM bearer capabilities. Area of application is implicitly the network control plane, but interactions between user and control plane have to be considered, too. The prime scope are switching nodes between access and core network domain, i.e., B-ISDN switches which have to provide user-to-network and network-to-network signalling protocol functions. Thus, beside service distinction call type differentiation is also covered due to the considered network positioning