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Second IEE National Conference on Telecommunications 1989

2-5 Apr 1989

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Displaying Results 1 - 25 of 78
  • International private telecommunications networking

    Publication Year: 1989, Page(s):27 - 31
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors examine the implications of international private networking from the perspective of a leading UK supplier of networking PBX products, and seek to highlight some of the issues, both technical and regulatory, that must be addressed if the full potential of international networking is to be realised. They address four of these issues, namely signalling, regulatory considerations, network... View full abstract»

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  • Data security in packet switched networks

    Publication Year: 1989, Page(s):375 - 379
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    The use of X.25 packet switching networks allows many channels to share one physical connection, and dynamically allocates bandwidth according to the immediate demands of each channel, including call management, without denying access to other channels. The paper outlines the categories of threat to data in such corporate X.25 environments, and includes a brief statement of the major security requ... View full abstract»

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  • British Telecom CCITT No.7 common channel signalling: past, present and future

    Publication Year: 1989, Page(s):21 - 26
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    After extensive studies during the late 1960s, British Telecom decided that an integrated digital switching and transmission network would provide the most economical telecommunications infrastructure for the future. The authors describe British Telecom's experience of specifying, installing, enhancing and managing a complex signalling network. They highlight the need for strict enhancement upgrad... View full abstract»

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  • Planning for the centralised control of transmission networks

    Publication Year: 1989, Page(s):369 - 374
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    Presents a view on how best to reach agreement on a standard network management interface (NMI). The following approach is adopted. The requirements of the transmission NMI are summarised by classifying the main types of transmission network management system. The progress towards standardisation is indicated with reference to work under the CCITT banner. A view of the remaining problems and a sug... View full abstract»

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  • Spherical codes for M-ary code shift keying

    Publication Year: 1989, Page(s):67 - 72
    Cited by:  Papers (3)  |  Patents (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    The author presents a number of spherical codes which can be implemented in practice and which are capable of providing significant coding gains on the AWGN channel. The geometrical approach to code design used also provides an alternative design method to the conventional algebraic approach. Other codes could easily be designed along similar lines, for a desired code rate or for some other desire... View full abstract»

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  • ISDNs for military environments

    Publication Year: 1989, Page(s):15 - 20
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The underlying raison d'etre of an ISDN in a military environment is no different from that of a commercial environment. Its function is to support the consultation, command and control activities of its users. The authors discuss the special requirements for military ISDN, considering security and service survivability. Design concepts for a NATO ISDN are given View full abstract»

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  • Assessment of the ability of an office local area network, employing the Technical Office Protocol (TOP) to carry interactive speech while heavily loaded with data traffic

    Publication Year: 1989, Page(s):349 - 351
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    The modern generation of office information systems are adopting local area networks (LANs) as the means of supporting the distributed computer systems currently being employed to provide electronic mail, word processing and file transfers facilities. Currently emerging standards tend to favour Carrier Sense Multiple Access Collision Detection (CSMA/CD) with Technical Office Protocol (TOP) for off... View full abstract»

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  • `Breaking up the street-the problem of telecommunications plant in the public highway

    Publication Year: 1989, Page(s):426 - 431
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (520 KB)

    Deals primarily with two aspects-first, the rights and duties of a utility to `break up the street' and place telecommunication apparatus in the public highway especially the changes which will result from a recent review by a government-instituted enquiry into these rights and duties; and second, the potential competition for space and risk of damage to apparatus in the use of underground space a... View full abstract»

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  • The future British Telecom core transmission network

    Publication Year: 1989, Page(s):364 - 368
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The incorporation of optical transmission, integrated electronics and computer technology into the BT digital transmission network has raised customer expectations of improved quality of service at reduced cost, and stimulated the rapid growth of new products and services. International debate over the last few years has resulted in a new set of CCITT standards defining a Synchronous Digital Hiera... View full abstract»

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  • Advances in digital circuit switching architecture

    Publication Year: 1989, Page(s):303 - 308
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    Today a wide range of communication services are provided by very complex systems embedded in the telecommunications networks which exist in both the public and private domain. The main applications supported are telephony and data, however new applications based on broadband connections will emerge as technology advances. Increasing use of digital techniques and computer control has allowed signi... View full abstract»

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  • Adaptive countermeasures for high capacity digital radio-relay systems

    Publication Year: 1989, Page(s):220 - 225
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    Reviews the techniques which either enable more efficient use of spectrum or improve overall transmission performance. These techniques include adaptive channel equalisation, antenna diversity, both of which can minimise distortion caused by multipath fading, and cross-polar interference cancellation to allow frequency reuse on the same hop. The effectiveness of these techniques can be gauged by t... View full abstract»

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  • Performance of Viterbi equalisers for the GSM system

    Publication Year: 1989, Page(s):61 - 66
    Cited by:  Patents (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    The author presents performance figures validating the choice of slot parameters and channel estimation procedures. In doing so, comparisons are made between two types of equaliser, both of which are based on the Viterbi algorithm (VA), performing maximum-likelihood sequence estimation of the incoming data sequence. Computer simulation is used to characterise the performance of both structures und... View full abstract»

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  • Formal logic and protocol specification

    Publication Year: 1989, Page(s):148 - 153
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Addresses the design and production of an integrated set of formally-based tools, and their use in developing and testing of a suite of communications protocol specifications: development of the tools occurred in response to the requirements of an existing communications protocol specification programme. The requirements originated from recognition of the impracticability of manually proving the s... View full abstract»

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  • Performance evaluation of the transmission of image data over digital networks involving mobile terminals

    Publication Year: 1989, Page(s):255 - 260
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Presents further investigations carried out into the performance evaluation of transmitted line diagram graphics images such as street maps, building plans, etc., through a mobile channel at data rates of 2400 and 4800 bit/s. The essential features of a suitable source code are identified and the geometric encoding, designed to meet these specifications, is presented. Computer simulation is used f... View full abstract»

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  • A new network for recorded information distribution

    Publication Year: 1989, Page(s):10 - 14
    Cited by:  Papers (1)  |  Patents (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    National recorded announcement services are expanding both in number and call volume. In order to improve the efficiency of the British Telecom network and so offer customers a better service, a new overlay network is being provided to distribute such announcements. This network, with its associated switching nodes, interfaces to the derived services network (DSN) and is known as the recorded info... View full abstract»

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  • Adaptive coding for conversational speech communication

    Publication Year: 1989, Page(s):344 - 348
    Cited by:  Papers (1)  |  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    Three techniques of channel capacity reduction (decreasing the SNR, decreasing the number of bits per sample, and decreasing the sampling rate) have been assessed for their subjective acceptability during double talk. A test-bed system capable of adaptively coding the speech sources during double talk has been constructed, this enabled us to hold conversational tests between two people through con... View full abstract»

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  • Payphones: a market in regulatory and technological transition

    Publication Year: 1989, Page(s):421 - 425
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    Considers the development of the UK payphone market, following the regulatory and technological changes that have taken place in recent years. In addition to assessing the market position today, January 1989, the author considers how the market will further develop into the 1990s. The issues covered include: regulatory change; technology; methods of payment; profit potential; public service; and c... View full abstract»

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  • Performance prediction for microwave digital radio relay systems

    Publication Year: 1989, Page(s):196 - 201
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    A digital radio relay system performance prediction model has been described which calculates the probability of outage for a link equipped with or without space diversity protection. The model gives severely-errored seconds outage predictions for an `average worst month', as well as for a specific period of measured fading on a link. Estimates of the variability of the so called average worst mon... View full abstract»

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  • A strategy for migration to OSI

    Publication Year: 1989, Page(s):37 - 41
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    The authors described the use of IT in the management of the Polytechnic of Central London. In particular, the development of management information systems, word processing, and the use of spreadsheets and electronic mail are discussed. A network strategy is outlined, and potential developments discussed View full abstract»

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  • The development of packet data communications in the ISDN

    Publication Year: 1989, Page(s):386 - 390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    As a circuit-switched network the ISDN inherently supports circuit-switched data services. But an increasing number of Information Technology applications involve short interactive transactions for which packet switching is the natural choice. Integrated access to packet mode services is therefore an important element of service integration in the ISDN. Following a brief historical perspective and... View full abstract»

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  • Managing flexibility in Synchronous Digital Hierarchy networks

    Publication Year: 1989, Page(s):358 - 363
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    Traditionally, efficient remote control of network elements has been difficult to achieve in terms of cost effective technology and the limitations imposed by the plesiochronous nature of the transmission network. There have however been some notable advances within British Telecom in recent years with the advent of Flexible Access Systems (FAS) in the Access part of the Network and Automatic Cros... View full abstract»

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  • The planning of expanding PMR services into a reduced spectrum

    Publication Year: 1989, Page(s):264 - 270
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    In the mobile radio field, industries have approximately 45000 mobiles and some 2500 base stations. In 1979 the World Administrative Radio Conference (WARC) amended the International Frequency Allocation Table to extend the VHF broadcasting band. As a result the JRC, along with many other organisations, found that its mobile radio spectrum was to be re-allocated. The challenge this presented, the ... View full abstract»

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  • Bridge architecture, performance, and management

    Publication Year: 1989, Page(s):277 - 281
    Cited by:  Patents (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    A bridge allows the physical interconnection of local area networks (LANs) whilst retaining their logical independence. Such interconnection extends the physical limits of LAN technologies and provides the mechanism for filtering LAN traffic in a manner which is both independent of end-station involvement and operates at full LAN data rates. A bridge operates at the medium access control (MAC) sub... View full abstract»

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  • An experimental testbed for a direct sequence spread spectrum local area network

    Publication Year: 1989, Page(s):288 - 293
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    Describes the production of an experimental testbed for the evaluation of a spread spectrum local area network (SS-LAN). The SS-LAN employs a direct sequence spread spectrum (DSSS) modulation technique for the realisation of the channel multiple access scheme. The testbed consists of two models: a software simulation and a hardware prototype. The hardware prototype is a real network and as such en... View full abstract»

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  • The synchronous digital hierarchy standard

    Publication Year: 1989, Page(s):297 - 302
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    Describes the technological, regulatory and market forces which led to the creation of the new hierarchical standard and the network requirements which were placed upon it. It then describes the frame format of the basic interface signal showing the principles of multiplexing the tributary bit rates, the functions of the overheads and the method adopted to achieve higher transmission rates. The pr... View full abstract»

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