By Topic

Telecommunications, 1989. Second IEE National Conference on

Date 2-5 Apr 1989

Filter Results

Displaying Results 1 - 25 of 78
  • Intelligent network development

    Publication Year: 1989, Page(s):402 - 406
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    Describes the intelligent network (IN) architecture which is defined, and will allow optimal distribution of IN functions across the network, ensuring central introduction of prototype or low-usage services followed by the distribution of the service logic as features are demanded. The co-location of high-usage service control point (SCP) functions with the service switching point (SSP) functions ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • British Telecom's approach to the intelligent network

    Publication Year: 1989, Page(s):397 - 401
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    The intelligent network (IN) concept embodies an open architecture which offers network operator's the ability to readily and economically create new network services and subsequently modify them in line with the specific needs of customers. The key elements of the concept which enable this flexibility are: elemental capabilities called service or functional components (FCs) which can be combined ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast packet switching for broadband ISDN

    Publication Year: 1989, Page(s):391 - 396
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    The paper is designed to serve as a brief introduction to the subject of fast packet switching with particular emphasis on designs of fast packet switch that have been proposed for use in the asynchronous transfer mode (ATM) of broadband ISDN. A simple classification of existing fast packet switch designs is introduced and examples of switch designs belonging to each class are described. Some elem... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power line modems and networks

    Publication Year: 1989, Page(s):294 - 296
    Cited by:  Patents (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    A look at the history, present applications and system designs for mains-borne data communications. Modern selection and networking software are covered View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effects of packet loss on 3 toll quality speech coders

    Publication Year: 1989, Page(s):380 - 385
    Cited by:  Papers (2)  |  Patents (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The integration of voice and data switching using a packet based approach has been proposed in many forms. If speech coding is used in such a network, impairments such as lost packets affect the coder performance. The effect of packet loss on 3 toll quality speech coders is discussed. The coders are adaptive differential pulse coded modulation (ADPCM), subband coding (SBC) and adaptive predictive ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interfacing of integrated switching system to a local area network

    Publication Year: 1989, Page(s):282 - 287
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The notion of passing integrated traffic over a single medium is appealing for office applications since it offers the possibility of reducing significantly the cost of the communication network. However, there is a question over which is the preferred network type: should a centralised switch be used, and modified to carry data traffic, or should a local area network be adapted to be able to carr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An overview of the CCITT X.500 directory system

    Publication Year: 1989, Page(s):179 - 183
    Cited by:  Papers (2)  |  Patents (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Discusses the newly emerged international standard for electronic directories. The author sets the background and rationale for the emergence of the directory standards; briefly describes the idealised structure of directory systems; discusses some opportunities for applying a specific directory system; and highlights some of the aspects which clearly require further refinement before being built ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Code-division multiple-access (CDMA) techniques in optical fibre LANs

    Publication Year: 1989, Page(s):111 - 115
    Cited by:  Papers (2)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    Presents a resume of the work on the application of CDMA techniques in optical fibre LANs. The work carried out shows how direct-sequence baseband spread-spectrum techniques, using sequence inversion keying (SIK) of unipolar code sequences, may be applied to the CDMA protocol for an optical fibre LAN. A mathematical model of the optical CDMA system is presented and used to derive performance measu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IEEE 802.9: a multi-service LAN interface

    Publication Year: 1989, Page(s):173 - 178
    Cited by:  Patents (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The IEEE 802.9 working group is preparing draft standard for an Integrated Voice and Data Local Area Network (IVDLAN) interface for use in an office environment. An IVDLAN, or Multi-Service LAN (MSLAN), must be capable of supporting a variety of services at the customer's premises. Currently these services are supported by separate networks, PBXs, for telephony (voice) and LANs for computer interc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison of novel superlattice structures and conventional APDS with implications for performance of optical fibre systems

    Publication Year: 1989, Page(s):106 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    Analytic results are presented indicating the performance of optical receivers incorporating superlattice avalanche photodiodes (APDs) allowing for the influence of both residual hole ionization and dark current. The results are compared with those for conventional APDs to indicate the number of stages required for superlattice devices to provide improved sensitivity. An assessment of the implicat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multicast communication facilities for distributed multimedia information systems

    Publication Year: 1989, Page(s):271 - 276
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    A typical Distributed Multimedia Information System (DMIS) is made up of clusters of workstations connected by local area networks. Such a system allows users to exchange information in the form of integrated documents containing text, graphics and voice. Recently, there have been proposals for such systems which support both store-and-forward (e.g. mail) and real-time material (e.g. conferencing)... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A study of the path availability improvements in a large network for various route diversity protection strategies, using failure event simulation

    Publication Year: 1989, Page(s):167 - 172
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    This study was motivated by the need to understand the way in which protection equipment capable of rerouting traffic lost after a section or route failure around that failure improves the path availability across a trunk network. Since no assumptions are made about bit rates in the results, then they may equally be applied not only to trunk networks but to regional and even local networks. Partic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electronically steerable free space optical communication beams

    Publication Year: 1989, Page(s):98 - 105
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    An experimental 4.1 km optical atmospheric communication link has been in operation between the Imperial College of Science and Technology and University College London since mid-April 1988. The authors describe the design features and the performance of the link, gives the initial assessment of atmospheric propagation at a wavelength of 830 nm in a typically urban environment and report the initi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Satellite television receivers for the domestic market

    Publication Year: 1989, Page(s):128 - 132
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    A new generation of television broadcasting was inaugurated on 5 February when Sky Television began its services of four new channels directed at UK homes. For many the key to receiving Sky and the other new channels is the purchase or rental of a direct to home (DTH) 60 cm satellite television receiver (STR). The take-up of satellite programmes will also depend upon the degree of public awareness... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of dynamic routing algorithms using a high-speed multiprocessor simulator

    Publication Year: 1989, Page(s):161 - 166
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    The design of a network simulator is presented which seeks to avoid the mainframe implementation limitations by the introduction of concurrent processing into the simulation environment and the major features of the software design are discussed in terms of their implementation requirements over the loosely coupled multiprocessor system. In the simulator, transputers are used to represent the node... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.