IEEE Transactions on Communications

Issue 7 • 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 (19)  |  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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  • 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 (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (644 KB)

    Well adapted to medium size systems, theTswitching 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 (or stages). Drastic improve... 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 (2)  |  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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  • Digital Time Division Switching for Military Communications

    Publication Year: 1979, Page(s):1138 - 1143
    Cited by:  Papers (1)  |  Patents (89)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (544 KB)

    This paper describes system designs and design techniques applied in the design of a digital time-division switching system for a military communication network. The digital switches are interconnected by bit interleaved digital time-division multiplexed trunk groups. The switching system uses an advanced non-blocking, bit interleaved, digital time-division switch matrix to switch synchronous voic... View full abstract»

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  • Synchronization for Telecommunications in a Switched Digital Network

    Publication Year: 1979, Page(s):1028 - 1033
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (664 KB)

    In a telecommunications network, the use of time division switches which directly operate on Pulse Code Modulated bit streams requires the use of some means for synchronizing the clock rates of such switches. Various methods for achieving synchronization are discussed. Master-slave synchronization has been selected as the most appropriate approach for the Bell System's switched digital network. So... View full abstract»

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  • An Approach to Multi-Service Subscriber Loop System Using Packetized Voice/Data Terminals

    Publication Year: 1979, Page(s):1112 - 1117
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (872 KB)

    A new subscriber communication system and its design philosophy are described. In addition to telephone communication, the system is simultaneously able to offer data communication, still picture communication, etc. The system is composed of a packetized voice/data terminal, a multi-service switching equipment and the digital subscriber loop connecting between them. The system utilizes the existin... 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 (4)
    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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  • Effect of Bit-Robbing in Tandem Digital Switches

    Publication Year: 1979, Page(s):1025 - 1027
    Cited by:  Papers (2)
    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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  • Transmission Planning for an Evolving Local Switched Digital Network

    Publication Year: 1979, Page(s):1019 - 1024
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    This paper examines the major issues associated with transmission planning for an evolving local switched digital network. Three general topics are discussed. First is the need to establish various "receive" levels within the digital switch in order to maintain existing toll loss and level plans. These are required because the integration of the interface between digital switching and transmission... 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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  • Research Model for Time-Separation Integrated Communication

    Publication Year: 1979, Page(s):940 - 947
    Cited by:  Papers (17)
    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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  • An Analysis of a Distributed Switching Network with Integrated Voice and Data in Support of Command and Control

    Publication Year: 1979, Page(s):1124 - 1130
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (768 KB)

    This paper explores the potential for increased transmission efficiency of military tactical command and control data links through voice/data integration. The relationship between voice and data communications as they are employed in support of Military Command is examined, and operational advantages to the integration of voice and data are enumerated. A message processing/handling paradigm of th... 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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  • Zero Loss Considerations in Digital Class 5 Office

    Publication Year: 1979, Page(s):1013 - 1018
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (640 KB)

    This paper describes the investigation performed to select impedance matching networks required to support zero loss digital end office switching. Subjective test results showed that 8 dB of sing margin is sufficient to prevent the introduction of additional degradations over the range of echo path delays associated with digital Class 5 switching. Analysis of loop data shows that balance networks ... 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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  • Synchronization of Multi-Exchange Local Network by Bit-by-Bit Method

    Publication Year: 1979, Page(s):1034 - 1046
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (976 KB)

    The paper presents a description of a synchronization system suitable for among others, multi-exchange local networks. It includes mathematical formulation and analysis, hardware design, and computer simulation of network operation. The mathematical model is formulated within a framework of a specific control system design that employs digital techniques. A perstation control loop takes the form o... 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