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IEEE Communications Magazine

Issue 9 • Date Sept. 1989

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Displaying Results 1 - 6 of 6
  • Broadband ISDN and asynchronous transfer mode (ATM)

    Publication Year: 1989, Page(s):17 - 24
    Cited by:  Papers (146)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    The transfer mode chosen by the CCITT Study Group XVIII Task Group on ISDN Broadband Aspects as the basis of broadband ISDN is called the asynchronous transfer mode (ATM). ATM is a high-bandwidth, low-delay, packetlike switching and multiplexing technique. It is essentially a connection-oriented technique, although it is envisioned as a basis for supporting all services, connectionless as well as ... View full abstract»

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  • Line codes for digital subscriber lines (ISDN basic access)

    Publication Year: 1989, Page(s):25 - 32
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (738 KB)

    The attributes of the several line codes considered for a North American standard for ISDN basic access are compared. Impairments that affect line code performance are examined, and their performance characteristics are discussed. An intuitive explanation of why the code performs as it does is attempted in each case. Some variations of the codes that were considered and that were intended to impro... View full abstract»

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  • Telecommunications research and development in Brazil

    Publication Year: 1989, Page(s):33 - 41
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (971 KB)

    The author presents the fundamentals of Telebras (Telecommunicacoes Brasileiras S.A.) R&D activities, which represent over 90% of all research and development efforts in the field of telecommunications in Brazil. He describes Telebras' strategy and operational approach. He reports results obtained in the areas of time-division electronic switching, digital transmission, satellite communications, f... View full abstract»

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  • Gray scale pictures via Group 3 facsimile

    Publication Year: 1989, Page(s):42 - 49
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (918 KB)

    The CCITT has developed a recommendation for Group 3 facsimile that is based on the transmission of binary picture elements (pels) having a brightness value that is either black or white. By introducing a minor modification into the basically bilevel facsimile system, dither coding delivers an output image that conveys gray-scale information. An analysis is made of three dither coding techniques: ... View full abstract»

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  • Burst switching-an update

    Publication Year: 1989, Page(s):50 - 57
    Cited by:  Papers (17)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (825 KB)

    Burst switching research in dispersed control and integrated switching is described. Burst transport is integrated in that voice and data are switched through the same switching fabric and transmission media. Burst switching is compared to and distinguished from fast packet, fast circuit, and ATM (asynchronous transfer mode) switching. Misunderstandings about burst transport that have appeared in ... View full abstract»

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  • Process control in standards bodies

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (245 KB)

    The author discusses major changes in the nature of telecommunication standards over the past 15 years. Fifteen years ago, standards followed technology, and manufacturers dominated standards activities. Contentions were avoided by adoption of multiple options in the standards. Today, users have a large presence in standards development. They demand interoperability of products and reject nonresol... View full abstract»

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IEEE Communications Magazine, considered by most to be their most important member benefit, provides timely information on all aspects of communications: monthly feature articles describe technology, systems, services, market trends, development methods, regulatory and policy issues, and significant global events.

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Huawei Technologies