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Communications Magazine, IEEE

Issue 1 • Date Jan. 1991

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Displaying Results 1 - 13 of 13
  • Asynchronous transfer mode or synchronous transfer mode or both

    Publication Year: 1991 , Page(s): 10 - 13
    Cited by:  Papers (5)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (890 KB)  

    Some of the problem areas attendant upon the asynchronous transfer mode (ATM) concept are addressed. Concern is chiefly with the use of small, fixed-length packets and the issue of congestion control. It is argued that broadband ISDN services should not be tied down to ATM as presently standardized, because ATM has several problems when embedded in a wide area network with diverse services.<> View full abstract»

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  • Switching in a competitive market

    Publication Year: 1991 , Page(s): 18 - 20
    Cited by:  Patents (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (805 KB)  

    The author examines the significance of the competitive positioning of the local exchange carriers with regard to their expectations of their network equipment providers and, in particular, the providers of the whole range of capabilities that fall within the broad category of switching. The point of view is that of a local exchange carrier whose principal products are public exchange access services, as defined by the AT&T divestiture agreement. Development of services, customer participation, transport capabilities, implementation agreements, and industry cooperation are discussed.<> View full abstract»

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  • Automation of alternate billed calls using speech recognition

    Publication Year: 1991 , Page(s): 25 - 29
    Cited by:  Papers (2)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (598 KB)  

    Alternate billed calls (collect, calling-card, bill-to-third-party), which represent close to 50% of the toll and assist traffic in North America, requiring substantial operator workforce expenditures for telephone companies, are addressed. The automated alternate billing service (AABS), which automates a large component of this traffic, is described. Emphasis is on the use of advances in voice recognition technology and an innovative call script tool designed to simplify realization of the AABS application. Network interfaces, voice-processing hardware, speech recognition, call processing, fraud, bilingual support, and future enhancements are discussed.<> View full abstract»

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  • AT&T's 5ESS switch: early experiences and details on planning and implementing a large-scale ISDN corporate R&D network

    Publication Year: 1991 , Page(s): 36 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (718 KB)  

    Early experiences with the AT&T ISDN 5ESS switch in the US are highlighted. A detailed description is given of the planning process used to determine the ISDN requirements and the ongoing effort needed for implementing a large-scale corporate integrated voice and data network for Bell Laboratories. Applications of the network for personal computer connections and for facsimile machines and other switched 64 or 56 kb/s services are discussed.<> View full abstract»

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  • Universal service creation and provision environment for intelligent network

    Publication Year: 1991 , Page(s): 44 - 51
    Cited by:  Papers (3)  |  Patents (41)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1233 KB)  

    The evolution of the intelligent network (IN) is summarized, and its service creation requirements and provision environment are clarified. A prototype system called the ISDN development experimental system for advanced services (IDEA), which has been developed to validate the foregoing, is described. The evaluation of the system design and its future evolution are discussed.<> View full abstract»

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  • Broadband public network and switch architecture

    Publication Year: 1991 , Page(s): 83 - 89
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1034 KB)  

    The authors present a view of public network and switch architecture evolution to broadband capabilities, driven by the applications evolutions and built on a synchronous fiber transmission infrastructure such as SONET (synchronous optical network). The scenario is based on the partitioning of broadband network functions between synchronous fiber transmission systems and cell-based transport. The first stage of evolution incorporates frame-based switching to support increasing data traffic for LAN (local area network) interconnections. Cell-based technology appears first in the form of point-to-point high-speed data trunks and then as switched high-speed access. Centralized cell switching will provide interconnect between cell-based trunks and shared access lines. Remote cell multipliers will provide traffic concentration when the number of customers further increases. Since cell transport will first be introduced in the network as an extension of frame transport to higher speed, interworking between cells and frames will be necessary.<> View full abstract»

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  • A scale database architecture for network services

    Publication Year: 1991 , Page(s): 52 - 59
    Cited by:  Papers (11)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1020 KB)  

    A radical technology for databases, called the Datacycle architecture, which implements a relational model for network services and scales to support throughput of thousands of transactions per second is proposed. A set of data manipulation primitives useful in describing the logic network services is described. The use of the relational model together with an extended structured-query-language-like query language to describe 800 service, network automatic call distribution, and directory-assisted call completion services, is examined. The architectural constraints on the scalability of traditional database systems is reviewed, and an alternative, the Datacycle architecture is presented. The Datacycle approach exploits the bandwidth of fiber optics to circulate database contents among processing nodes (e.g. switching offices or other network elements) in a network, providing highly flexible access to data and controlling the administrative and processing overhead of coordinating changes to database contents. A prototype system operating in the laboratory is described. The feasibility of the Datacycle approach for both existing and future applications is considered.<> View full abstract»

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  • A concurrent object-oriented switching program in Chill

    Publication Year: 1991 , Page(s): 60 - 68
    Cited by:  Papers (6)  |  Patents (46)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1806 KB)  

    A switching program structure that is expandable to allow inclusion of new service features and functions with minimum effort during run time, adaptable to handle enhanced services, allows new services to be added quickly, and is highly reliable, is proposed. It is based on the use of object-oriented programs, hierarchically structured programs, and building-block switching systems based on distributed processing. The discussion covers the logical switching system model, object-oriented switching program systems, concurrent object-oriented programming in Chill (CCITT high level languages), the software architecture, the building-block switching systems, and call processing. Early evaluation results are included.<> View full abstract»

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  • Evolution of metropolitan area networks to broadband ISDN

    Publication Year: 1991 , Page(s): 69 - 70
    Cited by:  Papers (15)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1031 KB)  

    Broadband architecture and network evolution strategies based on interface standards emerging from the IEEE 802.6 MAN Committee and the American National Standards Institute (ANSI) T1S1 and CCITT Working Groups on broadband integrated services digital networks (BISDN) are outlined. The recent history of both the MAN and BISDN standards activities is traced, and some of the motivations behind specific developments are discussed. In the context, local area networks (LANs) and MANs are compared and contrasted, with special attention given to requirements specific to a public MAN. The convergence of the MAN and BISDN protocols is examined. The benefits of commonality between these two standards are described in terms of lower-cost network architectures, and terminal equipment is examined. It is shown that broadband networks can exploit the synergy between 802.6-based MANs and wider-area BISDN networks, and that 802.6-based MANs can gracefully evolve into countrywide networks using BISDN asynchronous transfer mode (ATM) switching. Example networks are used to illustrate the evolution proposals.<> View full abstract»

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  • Large-scale ATM multistage switching network with shared buffer memory switches

    Publication Year: 1991 , Page(s): 90 - 96
    Cited by:  Papers (32)  |  Patents (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1095 KB)  

    The configuration of an asynchronous transfer mode (ATM) switch architecture using a shared buffer memory switch (SBMS) is discussed. The scaling factors of the ATM switching network under a condition of mixed applications, including a conventional mix and telecommunication with video, are analyzed. The use of the SBMS as the unit switch for a multistage switching network is examined. A prototype system and its performance evaluation and experimental data are presented. The data indicate excellent performance under a burst cell arrival condition. The buffer size of the SBMS can be reduced in comparison with that of an individual (nonshared) buffer memory switch. A configuration for a large-scale ATM switching network with multistage switches is proposed.<> View full abstract»

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  • Two years of experience with broadband ISDN field trial

    Publication Year: 1991 , Page(s): 97 - 104
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1937 KB)  

    The BERKOM project, which represents the largest broadband ISDN (BISDN) field trial in the world, is discussed. The objectives of the field trial are outlined. Three aspects of the test network are then addressed: system concept, system extension, and system experience. Tests demonstrated that the overall system performance met all requirements for telecommunication applications.<> View full abstract»

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  • A business cordless PABX telephone system on 800 MHz based on the DECT technology

    Publication Year: 1991 , Page(s): 105 - 110
    Cited by:  Papers (11)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1128 KB)  

    In January 1988, The European Conference of Postal and Telecommunication administrations (CEPT) decided to base the standard for medium and long-term applications of advanced digital European cordless telecommunications (DECT) on a multicarrier/time-division-multiple-access/time-division-duplex (MC/TDMA/TDD) approach. The Ericsson DCT 900 MC/TDMA/TDD pico cellular cordless telephone system concept is presented. It is a DECT-like system with limited data services operating up to 8 MHz in the 860 to 870 MHz frequency band, but it can be implemented anywhere in the 800 to 900 MHz bands. A description of the DCT 900 system and the cordless radio subsystem is included.<> View full abstract»

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  • ISDN in France-1987 to 1990: from the first commercial offering to national coverage of NUMERIS

    Publication Year: 1991 , Page(s): 30 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (876 KB)  

    NUMERIS, the commercial integrated services digital network (ISDN) in France, is discussed. National coverage was completed in 1990. NUMERIS specifications, network components, and customer premises equipment are described. Operational experience with NUMERIS, including equipment conformance testing and ISDN implementation, is examined. Applications development and the use of partnership ventures (usually involving a user, a service provider, and France Telecom) are discussed 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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies