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Communications Magazine, IEEE

Issue 8 • Date Aug 1995

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Displaying Results 1 - 7 of 7
  • Broadband networks and services: architecture and control

    Page(s): 24 - 32
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    Broadband networks to support a diverse combination of media and services present two interrelated challenges to the designers: how to devise the proper network architectures to efficiently deliver information, and how to realize the control and software infrastructure for end-to-end support of broadband applications. The new networks and applications that represent the future of interactive digital broadband are not driven by technology alone. We should recognize that the true foundation of the future information networking business involves the uses and benefits that it produces. The applications that are driving the information age are numerous, coming from the areas of entertainment, enterprise systems, telecommunications, education, health, etc. The use of client-server distributed object computing technologies is at the foundation of all the software systems that have been designed and implemented. There are still many Issues to he resolved in the application of this software technology, but it is clear that we must rely on distributed software designs to support the features of interactive broadband services. Concerns over the ability to manage complexity and scalability in these large distributed software systems are a common thread and an indication that the technology still needs to mature View full abstract»

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  • Broadband access: comparing alternatives

    Page(s): 34 - 46
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    Capital investments by network providers to develop broadband access for the information superhighway have inherent risks. Nevertheless, potential rewards to telephone companies, cable TV companies, and others for serving the end consumer in an expanding information economy make such investments a business imperative. This article focuses on the incumbent terrestrial access providers, the telephone local exchange carriers (LECs) and cable multiple system operators (MSOs). First, it cites the business environment and the information highway services that are driving local telephone and cable companies to invest in broadband access, as evolving technology and relaxing regulation enable the convergence of these two industries. Broadband access technologies are then reviewed and evolutionary paths from the respective embedded bases are considered, with respect to both today's choices and the long-term vision. The two choices for broadband access are loosely termed hybrid fiber-coax (HFC) and switched digital video (SDV). The thrust of this article is to explain why these two alternatives overshadow all others and to highlight the decision factors facing network providers in choosing between them View full abstract»

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  • TIP's performance quality of service

    Page(s): 74 - 81
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    The author presents a transport performance quality of service (QoS) parameter set, which enables applications to describe their required performance properties and guarantees appropriately. The performance QoS is provided at the service interface of the Transport and Internetworking Package (TIP), which is an adaptive transport system based on an object-oriented and modular architecture View full abstract»

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  • CATV return path characterization for reliable communications

    Page(s): 62 - 69
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    The authors have examined the basic characteristics of hybrid-fiber coax (HFC) return systems to evaluate their ability to support bidirectional communications. The ability to support bidirectional communications on cable plants will allow deployment of two-way video applications as well as telecommunications services over the HFC plant. The results of the studies indicate that ingress in the cable return path is primarily due to broadcast signals which accumulate due to the noise-funneling effect of the cable return. Although this ingress can manifest itself in strong narrowband interferers which will prevent the use of large bandwidth channels, a reduction of node size to nodes on the order of 500 homes or lower will reduce the amount of interference. Filtering, in which a portion of the spectrum is blocked from the subscriber residence may also result in a significant reduction of ingress. Other phenomena on the return path can be dealt with by means of sound communication system design, including forward error correction to deal with impulse noise, and adaptive equalizers to deal with reflections in high data rate designs. TDMA, FDMA, and CDMA can all be utilized on the cable return path, but the capacities which result when less than perfectly synchronized CDMA is utilized are substantially lower than for TDMA and FDMA. A single carrier TDMA approach will be highly susceptible to narrowband interferers, and is unlikely to be successful. For these reasons a TDMA/FDMA or pure FDMA approach with narrow channels is likely to be the most robust multiple access technique for the cable return path View full abstract»

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  • Standardization of network technologies and services

    Page(s): 82 - 90
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    Asatani (1994) reported on a variety of topics, including broadband aspects of ISDN (B-ISDN), intelligent network (IN), future public land mobile telecommunication systems (FPLMTS), and audiovisual multimedia services (AVMMS). With the exception of IN, the present report covers progress in those same areas, with a status report on telecommunication management network (TMN) and universal personal telecommunications (UPT). Fora and consortia which may influence standardizations on these topics and standardization activities related to information infrastructure (II) are also reported View full abstract»

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  • Development of integrated cable/telephony in the United Kingdom

    Page(s): 48 - 50, 55-60
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    The United Kingdom offers franchised cable television operators the unique opportunity to provision a competitive telephony service in addition to multichannel television services. The TeleWest Communications Group Plc., a joint venture between Telecommunication Inc. (TCI) and US West, have taken advantage of this opportunity to invest, operate, and assist in the operation of CATV/telephony in the United Kingdom. TeleWest owns or invests in 24 franchises, totalling approximately 3.6 million homes passed. Twenty-one of the 24 franchises wholly owned or invested in by TeleWest are offering competitive telephony as of the end of 1994. Others are set to start in the 1995-96 time frame. The article discusses the development of network architectures in support of TeleWest's cable/telephony opportunities in the United Kingdom. The article begins with an account of the history of U.K. cable/telephony, continues with the early developments and drivers of the architecture, discusses the current architecture and build, and concludes with an overview of future development and directions for the architecture View full abstract»

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  • Producing content producers [computer animation]

    Page(s): 70 - 73
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    Several off-the-shelf animation software packages provide extensive capabilities, obviating the need for studios to develop their own software, except for highly specialized effects and interfaces. These capabilities make it feasible for a university to educate students in animation production without years of software development. The author discusses The UTS School of Cinema-Television and The USC Computer Animation Laboratory in particular View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

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Editor-in-Chief
Sean Moore
Centripetal Networks