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Communications Magazine, IEEE

Issue 3 • Date March 1991

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Displaying Results 1 - 12 of 12
  • Historical perspectives on the US telephone loop

    Publication Year: 1991 , Page(s): 24 - 28
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    Past activities that have produced the telephone loop design prevailing in most parts of the world today are reviewed. The discussion covers the technology on which the early subscriber loops were based, the introduction of electronics, the structure of the loop, central office power systems, and loop testing.<> View full abstract»

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  • The evolution of digital loop carrier

    Publication Year: 1991 , Page(s): 31 - 35
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (557 KB)  

    The development of systems that apply digital multiplexing technology to the loop is examined. The analog carrier foundations of the present loop are reviewed, and the introduction of digital technology is described. The maturing of digital loop carrier (DLC) systems, integration of digital switching and loop transmission, operations issues, and factors that could constrain deployment of DLCs on a large scale are discussed.<> View full abstract»

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  • The introduction of optical fiber in the subscriber loop in the telecommunication network of DBP TELEKOM

    Publication Year: 1991 , Page(s): 36 - 38
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2067 KB)  

    The tasks and objectives of Deutsche Bundespost (DBP) TELEKOM and the regulatory environment in Germany are discussed. These objectives include rapid further development of the telecommunication infrastructure in western Germany and its buildup in newly added eastern Germany. The OPAL series of pilot projects, intended to develop fiber loop systems, is described. The projects, the first of which is underway are, among other things, to prove that various innovative concepts can be implemented: to determine the level of performance and cost that has been achieved or in a certain period can be achieved, providing a basis for the specification/standardization of the desired infrastructure at the subscriber line level; and to make possible the early provision of optical fibre systems that are cost effective, can be integrated, and can be upgraded to offer new services to various customer market segments.<> View full abstract»

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  • Local loop developments in the UK

    Publication Year: 1991 , Page(s): 50 - 59
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2071 KB)  

    The current status of the local loop in the UK today and how it is likely to grow in the future are described. British Telecom's operating environment is examined to provide an understanding of the starting point for the local loop strategy. After a brief review of the existing copper network, technological developments in copper, fiber, and radio systems that will shape the future local loop are explored. A flexible rollout strategy involving a mixture of copper, fiber, and radio technologies is proposed.<> View full abstract»

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  • Japanese subscriber loop network and fiber optic loop development

    Publication Year: 1991 , Page(s): 60 - 67
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1809 KB)  

    Japanese local-loop networks are addressed with a special focus on ISDN and fiberoptic systems deployment. Basic telecommunication services and local network evolution in Japan are reviewed, and the various types of loop transmission systems in existence are described. Future networks and systems development are discussed.<> View full abstract»

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  • Evolution of fiber in the residential loop plant

    Publication Year: 1991 , Page(s): 68 - 74
    Cited by:  Papers (18)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1169 KB)  

    The current status of fiber in the subscriber loop in the U S is reviewed. Efforts to promote a standardized approach are briefly examined. Issues involved in powering the distributed optoelectronic curbside terminals, designated optical network units (ONUs), adding video capability when, where, and as needed, and developing strategies for evolving narrowband fiber to the curb (FTTC) to broadband FTTC, including fiber extended to the home if warranted, are discussed. Loop architecture of the future are considered, and business issues are addressed.<> View full abstract»

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  • Power and energy in the local loop

    Publication Year: 1991 , Page(s): 76 - 82
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (825 KB)  

    Replacing copper wire in the local loop with glass fiber means that power will need to be provided locally rather than coming from the central office. The issues that this raises are addressed. The history of powering telecommunications in the local loop is briefly reviewed. Energy conservation and cost considerations are discussed. Distributed power processing is examined. Concerns specific to powering ISDN and fiber in the loop, respectively, are discussed.<> View full abstract»

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  • Establishing reliability and availability criteria for fiber-in-the-loop systems

    Publication Year: 1991 , Page(s): 84 - 90
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1118 KB)  

    Telephone service reliability and availability are examined historically. Availability objectives for fiber-in-the loop (FITL) systems are examined. Network, system, and component considerations are discussed. The problems raised by environmental conditions encountered by FITL systems are described, and the need for adequate reliability testing is discussed.<> View full abstract»

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  • Low-power digital radio as a ubiquitous subscriber loop

    Publication Year: 1991 , Page(s): 92 - 95
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (635 KB)  

    The recent growth in the use of digital radio is reviewed. The technology used to implement low-power digital radio in the local exchange loop plant is discussed. The integration of digital radio subscriber loops withnetwork intelligence is explored. The relationship between low-power digital radio loops and broadband fiber loops is briefly examined, and standards and frequency allocation activities are summarized.<> View full abstract»

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  • Digital subscriber line technology facilitates a graceful transition from copper to fiber

    Publication Year: 1991 , Page(s): 96 - 104
    Cited by:  Papers (18)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1396 KB)  

    The loop environment and the techniques that historically have been used for providing transmission treatment are reviewed. The digital subscriber line (DSL), which applies adaptive filtering to yield significant performance and administrative advantages, is introduced. How this technology will evolve to complement the emerging fiber-based network, providing timely, ubiquitous wire pair transmission capabilities at basic rate, primary rate, and above is examined.<> View full abstract»

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  • Business and residential services for the evolving subscriber loop

    Publication Year: 1991 , Page(s): 109 - 114
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (681 KB)  

    The role of new loop technologies in providing new and valuable services from increasingly dynamic and intelligent networks is examined. Important market trends in business services are discussed, and the needs of large business customers are considered. Evolutionary service opportunities for the low-end market are identified. It is shown that meeting the total communications needs of large corporate enterprises necessarily involves providing much improved communications capabilities to the low end of the market. The role of the advanced intelligent network is considered.<> View full abstract»

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  • The role of the broadband integrated services digital network

    Publication Year: 1991 , Page(s): 116 - 119
    Cited by:  Papers (7)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1034 KB)  

    An overview of the services andnetworking technologies under consideration for BISDN is provided. Future directions and challenges for broadband research and development are outlined. Some of the key technology issues, particularly those concerned with the administration and control of broadband networks, are discussed.<> View full abstract»

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IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

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Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies