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Selected Areas in Communications, IEEE Journal on

Issue 4 • Date July 1985

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Displaying Results 1 - 17 of 17
  • [Back cover]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • Editorial: Addition to the Editorial Board

    Publication Year: 1985 , Page(s): 493
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    Freely Available from IEEE
  • Guest Editorial

    Publication Year: 1985 , Page(s): 494 - 496
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    Freely Available from IEEE
  • Architecture, Design, and Development of the System 75 Office Communications System

    Publication Year: 1985 , Page(s): 522 - 530
    Cited by:  Papers (1)  |  Patents (3)
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    AT&T-IS System 75 is a new customer-premises digital communications system. It is designed to complement the larger AT&TIS System 85 in the intermediate size range of 20-400 stations and makes use of the same terminals and adjuncts. System 75 utilizes a distributed switching and control architecture and employs VLSI for a compact cost-effective realization. Integrated voice and data communications are supported with full voice conferencing capabilities and high-speed data switching. A process and message-based software architecture supports a large number of features and services, including a flexible user-oriented maintenance and administration capability, accessible from a local or remote system management terminal. This paper describes the system, the switch, common control, software architecture, system management capabilities, and product testing methods. View full abstract»

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  • ASBU 501 - A Digital SPC Voice/Data Switching System

    Publication Year: 1985 , Page(s): 531 - 545
    Cited by:  Papers (1)
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    The ASBU 501 is a fourth-generation all-digital switch employing distributed control architecture and a functional top-down design. This paper is organized in three major sections describing the structured system design, the basic equipment, and the software design principles for distributed control. The first section diagrams the layered functional structure and describes the subsystems, function blocks, and unit level (hardware and software). The second section on distributed digital equipment gives a description of the components for both telephony and data switching. The basic switching units which house and distribute the hardware devices are explained and a description and function of all of the equipment is provided. The third section discusses the software design principles utilized in the ASBU 501 distributed control system. View full abstract»

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  • Guidelines for the Preparation of Proposals for Special Issues

    Publication Year: 1985 , Page(s): 606 - 607
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    First Page of the Article
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  • The Horizon® Communications System

    Publication Year: 1985 , Page(s): 497 - 507
    Cited by:  Patents (2)
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    When the Horizon Communications System was introduced in 1977, it was one of the first processor-controlled hybrid Key TelephonePBX systems in the marketplace. It has evolved over time and been enhanced by adding both features and functions. This paper reviews Horizon's design and discusses some of the goals and the rationale which guided the development. Other than station message detail recording (SMDR) and toll restriction, Horizon's rich set of PBX features and their operation are not discussed. Rather, the technology employed, the system architecture, the relationship of the major component parts, the system software structure, and the maintenance and administration capabilities are explained. View full abstract»

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  • Integrated-Circuit and Packet-Switching Applications to a Loop System for Local Area Networks

    Publication Year: 1985 , Page(s): 574 - 583
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (920 KB)  

    The Universal Link System belongs to the "loop subsystem" of a local area network (LAN). This system has circuit-switching facilities and packet-switching facilities, and uses a local area network as an integrated switching system. The Universal Link System is well suited for a very wide range of uses, with the merits of both circuit switching and packet switching. The Outline of this system is described below. View full abstract»

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  • Distributed Control in a Key Telephone System

    Publication Year: 1985 , Page(s): 595 - 599
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    This paper describes the distributed microprocessor architecture used in the Electra IMS digital communication system. The system has been in service in the U.S. as of 1985. The system's maximum line size is 160, its maximum trunk size is 80, and it can accommodate both normal single-line telephones and proprietary digital telephones. Data switching can also be performed because of the PCM/ TDM architecture. The distributed architecture is composed of a system control (SCU) and six module control units (MCU), each MCU handles 32 ports of peripheral equipment. \bullet The SCU and MCU's have a simplified common OS designed to handle the basic call processes. \bullet The SCU executes line-state control, time-slot control, and systemfeature application. \bullet The MCU executes peripheral-operation control and peripheral-status control. Software architecture is divided into small modules which represent each system function at the SCU, or each operating sequence at the MCU, so that addition or deletion of system features is very easy to implement. Hand-shaking belwccn the SCU and MCU's is controlled using a "message" which consists of several words. This architecture enables a nonsquare key telephone configuration, the building-block concept, and future system enhancement. View full abstract»

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  • Transition to the AT&T-IS Integrated Private Network Architecture

    Publication Year: 1985 , Page(s): 600 - 605
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    Private corporate networks are evolving toward all-digital networks that combine voice and data transmission on a single network. The functional and economic advantages of those networks over their analog antecendents motivate this evolution. This paper describes AT&T Information Systems integrated private network architecture and its functional and economic advantages. View full abstract»

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  • The MERLINTMCommunications System

    Publication Year: 1985 , Page(s): 584 - 594
    Cited by:  Patents (1)
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    The MERLINTMCommunications System is a family of architecturally consistent small-business communications systems. The architecture is a star configuration with a central 8 bit microprocessor in the switch or Control Module for control of all telephone functions. The telephones and the processor exchange information over a proprietary four-pair protocol in a 24 bit message. In the Control Module, all I/O functions are memory mapped and under software control. The switch is an analog space-division solid-state crosspoint matrix, and the system capacities range from two CO lines and six telephones to eight CO lines and twenty telephones. Unlike many of its contemporaries, this system is designed to be installed, administered, and maintained by customers, although many users can be expected to opt for full-service support. Features and options can be added by a family of plug-in cartridges allowing the whole system to be sold directly from a catalog to a customer with limited training. Another design intent, simplified by stored-program control, is to incorporate many of the more popular and useful call-handling features of larger PBX's. A list of these is given in the Appendix. The stored program containing those features resides in a plug-in cartridge. This article will highlight the electrical and physical design of three of the MERLIN communications systems (CS): models 206, 410, and 820. View full abstract»

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  • The Harris 20-20 Integrated Network Switch

    Publication Year: 1985 , Page(s): 561 - 568
    Cited by:  Papers (1)  |  Patents (4)
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    This paper describes the system architecture of the Harris 20-20, an integrated voice/data network switch. Both hardware and software aspects of the system are presented. The hardware buses and all major assemblies are identified and described. The architecture is innovative in that the system accommodates both North American and European standard multiplex equipment. The software design permits the subsystems to all run on a single microprocessor or to be distributed over multiple processors with no change to the application-level software. View full abstract»

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  • The CBX II Switching Architecture

    Publication Year: 1985 , Page(s): 555 - 560
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (680 KB)  

    This paper describes the architecture of the ROLM CBX II, a highly modular successor to the ROLM CBX. The paper outlines the physical and logical construction of the system and its capabilities, concentrating on data communications. The development goals for the system are presented, and the system characteristics are related to the goals. Architectural features which provide the basis for future enhancements are described. View full abstract»

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  • The Evolution of Data Switching for PBX's

    Publication Year: 1985 , Page(s): 569 - 573
    Cited by:  Patents (4)
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    This paper compares and contrasts the different traffic requirements of both voice and data communications. The role of evolving PBX technology in solving data communication needs is outlined, beginning with the analog PBX's of the 1970's and the digital-switching technology of the 1980's. The evolution of packet switching, and its superiority over traditional circuit switching for solving data communications needs, is analyzed. The paper concludes by describing a PBX implementation that takes advantage of circuit- and packet-switching technologies and thus offers a truly integrated multipurpose communications switch. View full abstract»

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  • New Development Method of Office Automation-Oriented PBX's

    Publication Year: 1985 , Page(s): 546 - 554
    Cited by:  Patents (1)
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    This paper describes a new methodology for developing office automation-oriented private branch exchanges (OA-PBX). Business communications are closely related to the type of business, information used in the business, and the people working in that business environment. It is expected that business communications services, man-machine interfaces, and equipment will become significantly diversified and personalized compared to conventional telephone systems offering limited services. In the development of PBX's, which are expected to play a large role in the OA environment, how to rapidly and flexibly cope with diversified and personalized business communication needs must be considered. To precisely know the user's needs and to fully reflect them in products, it is necessary to introduce a new "quick-reaction" development methodology to replace conventional ones used for systems with limited services and long life cycles. This paper proposes the rapid prototyping of OA-PBX's and associated tools. A personal computer-based PBX prototype system with circuit/packet hybrid switching functions, which is used for evaluating system functions and services, is described. A new application-oriented specification language AIFLS (architecture independent formal language for switching service specification), and an automatic programming system APROC-1, which is a kind of expert system, are used for quickly and easily making software mock-ups of switching services and man-machine interfaces and are also presented here. View full abstract»

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  • Distributed Microprocessors Control Architecture for Versatile Business Communications

    Publication Year: 1985 , Page(s): 508 - 521
    Cited by:  Papers (2)  |  Patents (1)
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    This paper describes the NEAX®2400 Information Management System (IMS), which is no longer a conventional telephone switching system, but is instead a switching hub for various office automation equipment. The NEAX2400 IMS not only provides various circuit-switching functions such as conventional voice communication (telephone) switching, low-speed and high-speed data switching, but also provides stored and forward capabilities for voice (voice mail) and data (text mail, facsimile mail, etc.). This paper especially emphasizes the basic EPBX features and functions of the NEAX2400 IMS. The standard 64 kbit/s PCM technique is used for digitalization of voice signals, and switched through a nonblocking architecture time-division digital network. All digital data signals are transmitted through the same time-division digital network at the 64 kbit/s rate intermixed with digital voice signals. The controls of the switching functions, station service features, and maintenance service are performed by functionally divided distributed microprocessers. The most outstanding attribute of the NEAX2400 IMS is the unique building-block architecture of the equipment configuration. Modules are stacked above the basic module as the number of line and trunk ports, or additional stored and forward features are required. Up to four additional modules can be stacked up as a single module group. This unique arrangement permits the NEAX2400 IMS to be very flexible in its system applications and expandability. Practically, the NEAX2400 IMS will economically service as few as 184 ports (mixture of voice/data, line/trunk) and can be continuously expanded to as many as 23 184 ports. View full abstract»

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Aims & Scope

IEEE Journal on Selected Areas in 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
Muriel Médard
MIT