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IEEE Transactions on Communications

Issue 7 • Date July 1979

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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  • Prologue: Digital Switching - Editor's Comments

    Publication Year: 1979, Page(s):937 - 939
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  • Digital Switching - How It Has Developed

    Publication Year: 1979, Page(s):948 - 959
    Cited by:  Papers (17)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1493 KB)

    Digital techniques are discrete techniques and they have been applied to automatic telephony since its invention. The technology for the extensive application of digital switching and marriage to similar transmission techniques and services dependent thereon are emerging as economically viable. A clearer understanding of the principles of digital switching is now perceived. Definitions are given t... View full abstract»

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  • Prologue: Section II - Technologies and Architectures - Editor's Comments

    Publication Year: 1979, Page(s): 960
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  • Subscribers Line Connection Units - Present Realizations and Future Trends

    Publication Year: 1979, Page(s):973 - 978
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (819 KB)

    From the early prototype stage to present day, the El0 system has used different types of concentrators to connect subscriber lines. A new type of concentrator, the CSE 1000, is described in this paper. This concentrator has been developed for the new version of the El0 called the El0 B. Decentralized control based on microcomputers and space division concentration using electronic crosspoints are... View full abstract»

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  • System Design of Digital Telephone Switching System - NEAX 61

    Publication Year: 1979, Page(s):993 - 1001
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (999 KB)

    This paper describes the design objectives and system structure of the NEAX 61 Digital Telephone Switching System, newly developed by Nippon Electric Co., Ltd. The NEAX 61 is an extremely wide-coverage system in both its application range and capacity range. Furthermore, the system's unique structure allows it to be highly costefficient at any size and in any of its applications. NEAX 61 is distin... View full abstract»

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  • No. 4 ESS - Evolution of a Digital Switching System

    Publication Year: 1979, Page(s):1001 - 1011
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    The No. 4 Electronic Switching System, a high capacity, toll and tandem system based on digital time division switching was first placed in service in Chicago on January 17, 1976. It has provided improved system operation and new service features at reduced cost in comparison to the existing electromechanical systems. The flexibility of system architecture has permitted the evolution of the No. 4 ... View full abstract»

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  • Prologue: Section III - Digital Switches in the Network - Editor's Comments

    Publication Year: 1979, Page(s):1012 - 1013
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  • Prologue: Section IV - Digital Switching Systems/Networks of the Future - Editor's Comments

    Publication Year: 1979, Page(s):1079 - 1080
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  • Digital Switching - Forces Which Shape Its Future

    Publication Year: 1979, Page(s):1144 - 1150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (853 KB)

    While the theories relevant to digital communication switching have been understood for some time, it is only now economically feasible to place a digital switch into an analog environment. This permits the transition from an analog-oriented communications world into a digitally oriented communications world without the need for costly interfaces or for the building of special overlay networks. Th... View full abstract»

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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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  • Development of a Time-Division Switching Network Usable in a Very Large Range of Capacities

    Publication Year: 1979, Page(s):982 - 988
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Well adapted to medium size systems, the T switching networks fully proved the operational value of the time division principles. For higher capacities, the more usual realizations are now STS and mainly TST networks. These are attractive as the growth of the equipment proportional to the square of the number of subscribers is limited to the intermediate stage ... View full abstract»

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  • External Clock Synchronization Plans for the GTD 3 EAX Digital Toll/Tandem

    Publication Year: 1979, Page(s):988 - 992
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The GTD 3 EAX local clock was designed with external synchronization in mind. The initial control algorithms and control circuits required a minimum of change to incorporate the ability to maintain clock synchronization with an external timing reference. The synchronization technique used is a frequency lock method and the considerations necessary for synchronization are described in this paper. View full abstract»

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  • Some Architectural Alternatives in the Design of a Digital Switch

    Publication Year: 1979, Page(s):961 - 972
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    This paper presents a general survey of some common trends emerging in the field of digital central office architectural concepts, as promoted by technological progress and countered by the constraints of the existing telephone network establishment. No specific systems are covered, but solutions which might indicate a trend are identified and discussed. The main body of this paper is devoted to a... View full abstract»

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  • Digital Switching in France

    Publication Year: 1979, Page(s):1047 - 1055
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    This paper intends firstly to present how digital switching was introduced into the French network nearly ten years ago and what are the main advantages brought by digital switching systems. Various cases in the network such as trunk or local exchanges are examined; general as well as particular advantages are shown. Secondly, the technical requirements for these exchanges are described; an emphas... View full abstract»

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  • Line Circuit Interfaces for a Digital Switching System

    Publication Year: 1979, Page(s):978 - 982
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Crucial to the design of digital switching systems for local switching applications is the line circuit interface. It forms the boundary between the analog, 2-wire, subscriber loop, with its attendant environment hostile to low-voltage electronics, and the digital logic environment. ITT North's DSS uses a Quad Line Circuit (QLC) that provides the line circuit interface between four subscriber loop... View full abstract»

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  • Research Model for Time-Separation Integrated Communication

    Publication Year: 1979, Page(s):940 - 947
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1408 KB)

    A new communication system concept which is an important step toward an all-digital telecommunication plant is discussed. A research model, called ESSEX (Experimental Solid State Exchange), which combines remote line concentration, time-separation switching and PCM transmission is introduced to demonstrate the concept. The model, which uses solid state devices, works at the speed of a full-size sy... View full abstract»

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  • Effect of Bit-Robbing in Tandem Digital Switches

    Publication Year: 1979, Page(s):1025 - 1027
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The effect of bit robbing in tandem digital switches is shown to consist of a time-varying linear distortion comparable to aliasing distortion in addition to increased quantization distortion. Alternative bit-robbing strategies in which this linear distortion can be reduced or eliminated are evaluated, and recommendations are made for future digital switch designs. View full abstract»

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  • Switched Communications for the Department of Defense

    Publication Year: 1979, Page(s):1131 - 1137
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The Department of Defense, in response to its unique telecommunications needs and in an effort to take advantage of advances in technology, has embarked on an evolutionary, systematized program to develop and procure electronic, software controlled circuit switches. Two development programs presently underway will result in the fielding of two kinds of state-of-the-art circuit switches; a large hy... View full abstract»

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  • Microprocessor Application to Telephone Terminal Switching System Architecture

    Publication Year: 1979, Page(s):1088 - 1095
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Microprocessor application to a switching system, especially to telephone terminals, is expected to change switching system architecture. From this viewpoint, Basic Experimental Switching System (BESS) is designed as a functionally distributed control switching system accommodating intelligent terminals. This paper describes BESS hardware and software structures. BESS has the following characteris... View full abstract»

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  • The Intelligent Communications Switching Network

    Publication Year: 1979, Page(s):1080 - 1087
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A new type of digital switching network for use in class five telephone offices is described. A special-purpose high-speed digital processor executing a stored program performs the switching functions. The network can provide programmable gain or loss as well as conference circuits for voice connections. It can also provide multiple and independent data circuits in combination with the voice circu... View full abstract»

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  • A Digital Subscriber Set

    Publication Year: 1979, Page(s):1096 - 1103
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The Electronics Research Laboratory at the Norwegian Institute of Technology has since 1974 studied PCM-transmission in the local subscriber plant. A short discussion of this work is presented together with choice of design parameters and concept for a digital subscriber set. Construction and laboratory testing of the digital subscriber set are described. The paper concludes with a discussion on f... View full abstract»

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  • Survey of Digital PBX Design

    Publication Year: 1979, Page(s):1118 - 1124
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    It is the purpose of this paper to discuss the capabilities and organization of all digital PBX's currently being manufactured in the United States. A digital PBX is one which encodes incoming signals into representations where the presence, or absense, of pulses, or levels, defines the signal; such a system switches signals by routing, multiplexing, or storing these pulses or levels. Pulse amplit... View full abstract»

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  • Pragmatic Introduction of Digital Switching and Transmission in Existing Networks

    Publication Year: 1979, Page(s):1071 - 1078
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Introduction of digital Switching and transmission in existing networks depends on a multiplicity of factors, which are either network or system dependent. Digital network planning alternatives are discussed with reference to the introduction techniques (stand alone or integrated switching and transmission) and to the interconnection strategies with the analog network. A pragmatic approach with di... View full abstract»

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  • The Introduction of Digital Switching to the Local Network

    Publication Year: 1979, Page(s):1056 - 1064
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The availability of digital switching equipment has created a new perspective in network planning, especially with the introduction of digital switching into the existing local telephone network. A model is described as well as results derived using real network data. The model defines feasible network evolution strategies and the corresponding economic criterion. The results include the derivatio... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas