1988 International Zurich Seminar on Digital Communications - Mapping New Applications onto New Technologies. Proceedings

8-10 March 1988

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  • 1988 International Zurich Seminar on Digital Communications: Mapping New Applications onto New Technologies (Cat. No.88TH0202-2)

    Publication Year: 1988
    Cited by:  Patents (2)
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    Freely Available from IEEE
  • Coping with complexity: service specification for a network services testbed

    Publication Year: 1988, Page(s):13 - 20
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The authors discuss their efforts to control the complexity of service specification in the modular integrated communications environment (MICE), a rapid prototyping system for network services. In MICE, services are defined in interpretively-executed fine-state logic tables. They describe attempts to reduce the complexity of service logic specification in MICE by means of a graphical structure ed... View full abstract»

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  • Multiparty desktop conference system based on integrated group communication architecture

    Publication Year: 1988, Page(s):21 - 27
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    A computer-supported desk-to-desk conference system, which allows a group of users to conduct a meeting from their telephone-attached workstations, is described. Participants can jointly view and manipulate relevant multimedia information distributed through a local area network and simultaneously use voice communication to discuss the information they are sharing. The system design is based on an... View full abstract»

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  • Multipoint communication control for document-oriented teleconferencing

    Publication Year: 1988, Page(s):29 - 35
    Cited by:  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (415 KB)

    The authors describe a multipoint document-oriented teleconferencing system, which is called the audio document teleconferencing system (ADCS). The multipoint communication node is composed of a graphic signal distribution module (GDCM) and an audio signal distribution module (ADCM). The system is based on a token ring network, and the token contention control and related protocols are discussed i... View full abstract»

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  • Videomatic switching: systems and services

    Publication Year: 1988, Page(s):37 - 43
    Cited by:  Patents (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    An overview is provided of the trends in videomatic services and systems now coming into being with the advent of ISDN (integrated-services digital networks) and the prospect of broadband ISDN. Service aspects are discussed, including videoconferencing, videocoding, and videotelephony, and the LVX (local video exchange) system, an integrated video-voice-data local area network, is described from i... View full abstract»

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  • Security services in telecommunications networks

    Publication Year: 1988, Page(s):45 - 52
    Cited by:  Patents (72)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (689 KB)

    The issues that are relevant to computer security and communications security are reviewed, including security architecture and cryptography. Possible solutions for security management functions that are compatible with present and future telecommunications networks standardized by CCITT are described. European cooperation is briefly considered.<<ETX>> View full abstract»

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  • An ISDN basic access LSI

    Publication Year: 1988, Page(s):53 - 57
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (321 KB)

    A description is given of an ISDN (integrated-services digital network) basic-access LSI that can be used in various kinds of terminals. This LSI performs all layer-1 and layer-2 functions defined by CCIT recommendations I.430 and I.441. The LSI also contains input/output functions that enable it to be directly connected to a layer-3 microprocessor. This LSI's functional specifications, configurat... View full abstract»

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  • Eradicating the central office with coherent optical technology

    Publication Year: 1988, Page(s):59 - 62
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

    The replacement of the central office by a passive fiber network, the wide spectrum of which is used as an optical ether, is considered. Applications in the local loop and, with the addition of optical amplifiers, in long-haul networks, are discussed. The technology needed for such systems is considered.<<ETX>> View full abstract»

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  • A multi-media network architecture for ISDN and beyond

    Publication Year: 1988, Page(s):63 - 70
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The author discusses an evolution and growth in structure of telecommunications networks to provide enhanced services and permit potential simplification of network operation and management. The approach he suggests offers numbering flexibility/portability, unrestricted network dimensioning and provides unification of signaling for existing and new applications. Network evolution involves structur... View full abstract»

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  • A set of operating system mechanisms to support multi-media applications

    Publication Year: 1988, Page(s):71 - 76
    Cited by:  Papers (13)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (702 KB)

    The operating system of a terminal in a multimedia communication network needs mechanisms to manipulate the network interface and to direct the information flow. Some approaches and hardware support that can provide these capabilities are reported. These include a connector object to control the information exchange among the network interface and the voice, data, and image peripherals and the con... View full abstract»

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  • BERKOM-a broadband ISDN project

    Publication Year: 1988, Page(s):77 - 86
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    The authors discuss BERKOM (Berliner Kommunikationssystem), a pilot project of the German PTT for broadband-ISDN (B-ISDN), which was started in Berlin (West Germany) in 1986. They outline the architecture and major solutions adapted for a global system, and describe a reference model developed for the global system to guarantee the coherent development of the different modules and their interworki... View full abstract»

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  • Evolving high speed packet capabilities in a distributed switching system

    Publication Year: 1988, Page(s):87 - 92
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    A brief description is given of the principles outlined in CCITT recommendation X.31, which constitutes the first point of reference for the integration of packet services in the narrowband integrated-services digital network (ISDN). The architectural problems that arise when trying to integrate the new narrowband and broadband packet services into ISDN. Remarks are made concerning ISDN developmen... View full abstract»

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  • Timers in OSI protocols-specifications versus implementation

    Publication Year: 1988, Page(s):93 - 98
    Cited by:  Papers (4)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (594 KB)

    The authors discuss modeling and implementation of timers in OSI protocols. They examine the Estelle, Lotos, and SDL specification languages with emphasis on the features that can be used to express timing. They develop the corresponding models for timer facilities, and discuss possible mechanisms that would support them. As an example drawn from full implementations of the ISO transport and netwo... View full abstract»

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  • Communication protocols and concurrency: an Occam implementation of X.25

    Publication Year: 1988, Page(s):99 - 102
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    Experience with the use of the current software and hardware offerings is presented and discussed in relation to practical implementation of the CCITT recommendation X-25. An implementation of X.25 is made using the concurrent programming language Occam and its associated hardware, the transputer. Their suitability in such an application is investigated. In particular, the simplicity of software d... View full abstract»

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  • The implementation of a specification language for OSI systems

    Publication Year: 1988, Page(s):103 - 107
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB)

    During the years 1981-7, experts from the ISO/TC97/SC21/WG1 ad hoc group on FDT (formal description techniques) subgroup C developed a very-high-level specification language for open distributed systems, called the LOTOS (language of temporal ordering specification). Its high level of abstractness precludes a direct compilation. An architectural overview is presented of a set of tools, named LIW (... View full abstract»

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  • Stepwise specification of a sliding-window protocol by means of process algebra

    Publication Year: 1988, Page(s):109 - 114
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (553 KB)

    The author introduces a simple language, a subset of the formal language LOTOS, expressive enough to describe a wide range of communication behavior. He shows the applicability of this specification language to a sliding-window protocol taken from the literature. The specifications start with the definition of the service of the protocol. The underlying service is precisely defined, giving the fra... View full abstract»

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  • A method for the support of specifying the requirements of telecommunication systems

    Publication Year: 1988, Page(s):115 - 122
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The analysis of the functional behavior of telecommunication systems and its representation in a form that is largely independent of the implementation are described. A specification method for distributed systems has been devised that takes into account the special requirements of the first phases of the system lifecycle and the complexity of real systems. The method is based on the principles of... View full abstract»

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  • A graphical tool for the design and prototyping of distributed systems

    Publication Year: 1988, Page(s):123 - 129
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Modern graphical user interface techniques are used in the design and specification of complex distributed systems. A window-oriented and menu-driven net-editor and an integrated simulator with animation support have been implemented. This toolset is based on high-level Petri nets, extended with an object-oriented paradigm and a hierarchical structuring facility. The flexibility and high level of ... View full abstract»

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  • MHS conformance testing (message handling)

    Publication Year: 1988, Page(s):131 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB)

    Worldwide activities related to conformance testing of X.400 message-handling systems are discussed. The test laboratories and test tools are described. Technical and operation problems that are being encountered and their solutions are examined.<<ETX>> View full abstract»

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  • MHS conformance testing experiences in designing a test suite (message handling)

    Publication Year: 1988, Page(s):139 - 145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB)

    The process of designing the conformance testing specification manual X.403/CTSM.1 for interpersonal messaging systems is described. This CCITT document was developed by two working groups of the Swiss PTT project. The notation for test-case specification and a number of decisions taken to arrive at this notation are explained. The CTSM.1 manual was used as a reference for the other documents on X... View full abstract»

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  • ALICE: a layer independent conformance equipment

    Publication Year: 1988, Page(s):147 - 154
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB)

    In parallel with standardization work in the area of communication software, the interest is rapidly growing for testing methods and tools to assess that protocol implementations conform to the relevant standards and are capable of interworking with other products. A description given of a testing system named ALICE (a layer independent conformance testing), the main feature of which is to be as i... View full abstract»

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  • Modelling and analysis of a high speed token ring backbone network for a realistic scenario

    Publication Year: 1988, Page(s):155 - 161
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A multiple-token-ring-backbone is modeled and evaluated for mixed traffic imposed by different applications. The suitability of this medium-access protocol is studied on the basis of both queue length and packet delay. The token access method is analyzed with respect to buffer dimensioning and packet delay. A realistic scenario with file transfer and interactive traffic reaching a high-speed backb... View full abstract»

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  • Performance modelling of the Cambridge Fast Ring protocol

    Publication Year: 1988, Page(s):163 - 170
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    The Cambridge Fast Ring is high-speed slotted ring. The features that make it suitable for use at very large transmission rates are the synchronous transmission, the simplicity of the medium-access-control protocol, and the possibility of immediate retransmission of erroneous packets. A novel analytical model of the Cambridge Fast Ring with normal slots is presented. The model is shown to be accur... View full abstract»

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  • An investigation of packetised voice on the FDDI token ring

    Publication Year: 1988, Page(s):171 - 178
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (498 KB)

    The aim of the study is to verify that the fiber distributed data interface (FDDI), a proposed American National Standard for a 100 Mb/s token ring network using a fiber-optic medium that can support packetized voice while providing a reasonable service for asynchronous traffic. The authors begin by analyzing the maximum number of voice conversations the can be supported by a 100 Mbs/s FDDI token-... View full abstract»

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  • An improved CSMA/CD protocol for the packet-switched channel of the integrated services terminal bus

    Publication Year: 1988, Page(s):179 - 184
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (398 KB)

    The Integrated Services Terminal (IST) bus is a low-cost, ISDN (integrated-services-digital-network)-compatible LAN that carries eight 64 kb/s circuit-switched channels and one 64 kb/s packet-switched channel. An improved CSMA-CD (carrier-sense multiaccess with collision detection) protocol on the latter channel guarantees access even with 100% load. The results of a computer-based investigation i... View full abstract»

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