Proceedings of the IEEE

Issue 9 • Sept. 1977

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Displaying Results 1 - 25 of 48
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1977, Page(s):1235 - 1236
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  • What is telecommunications circuit switching?

    Publication Year: 1977, Page(s):1237 - 1253
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2043 KB)

    This article is an attempt to provide one with no knowledge of telecommunications circuit switching with some insight into its complexity and technological progress. This subject has for many practicing telecommunication engineers been treated as enigmatic. The problem is that switching is a combination of many details. The power of modern technology has added to the complexity of the features and... View full abstract»

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  • The new possibilities of telephone switching

    Publication Year: 1977, Page(s):1254 - 1263
    Cited by:  Papers (1)
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    Switching system architectures have evolved to be responsive to the needs of the user. Their design has been constrained by the existing environment which treats terminals, transmission channels, and switching entities as separate "black boxes." Telephone switching circuits have used relatively expensive discrete components, and hence, system designers used common control techniques to minimize th... View full abstract»

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  • The theory of connecting networks and their complexity: A review

    Publication Year: 1977, Page(s):1263 - 1271
    Cited by:  Papers (24)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (872 KB)

    Connecting networks are key subsystems of communications switching systems. This paper reviews what is known about the theoretical minimum complexity of connecting networks of several different types and presents the best known explicit constructions for them. In some cases, such as for strictly nonblocking connection networks, there is a significant difference between the best known construction ... View full abstract»

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  • Considerations on analog and digital electronic switching networks and their applications

    Publication Year: 1977, Page(s):1271 - 1283
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1165 KB)

    It is expected that electronics will play a major role in the next decades in the implementation of switching networks for telephone exchanges, as it has already happened both in transmission and exchange control [1]. Making use of many results of the referenced literature, some considerations are presented in order to compare electronic analog and digital switching networks for telephone exchange... View full abstract»

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  • Design approaches and performance criteria for integrated voice/data switching

    Publication Year: 1977, Page(s):1283 - 1295
    Cited by:  Papers (25)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1386 KB)

    This paper examines some of the fundamental problems associated with the design and performance of integrated systems and networks that switch both voice and data. Specifically, the need for an integrated approach to the switching and transmission of voice and data is explored and alternative design considerations are discussed. One approach, described in detail, utilizes a distributed architectur... View full abstract»

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  • Some aspects of time-division data switch design

    Publication Year: 1977, Page(s):1295 - 1304
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1012 KB)

    A number of techniques for configuring circuit switching data network carrying mixed bearer rate traffic are discussed. In the network, blocking probability unbalance among different bearer rates arises on highway and switch, for example, due to fractional occupation of usable channel for high bearer rate call by lower bearer rate call. Such a problem due to handling mixed bearer rate traffic is f... View full abstract»

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  • Telecommunications processors

    Publication Year: 1977, Page(s):1305 - 1313
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1075 KB)

    Telecommunications controllers worldwide are becoming increasingly stored-program oriented. Electromechanical and electronic wired logic controllers lack the flexibility, maintainability, and (ultimately) the economy of stored program processors. While similar to commercial computers, most stored program telecommunications processors have features unique either in nature or degree of application. ... View full abstract»

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  • Stored program control-assisted electromechanical switching—An overview

    Publication Year: 1977, Page(s):1313 - 1323
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1186 KB)

    This article provides an overview of localized stored program control applications in existing electromechanical switching systems. Economic factors and design constraints imposed by established system architectures are reviewed. Criteria for introducing stored program control, along with main design considerations for its implementation, are outlined. Examples are given of actual electro-mechanic... View full abstract»

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  • Interprocessor communication in systems with distributed control

    Publication Year: 1977, Page(s):1323 - 1329
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (680 KB)

    A multiprocessor communication technique, called Sub-Module Interface (SMI) because it enables exchange of information between telephony control units (submodules), was developed for a telephony switching system, thus realizing a distributed control philosophy. In addition to allowing any processor to communicate with any other processor in the system, a variety of devices attached to the SMI can ... View full abstract»

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  • Changing technology in switching system software

    Publication Year: 1977, Page(s):1329 - 1335
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (889 KB)

    The evolution of software techniques within the context of stored program controlled telephone switching systems is discussed in this paper. The paper starts with the transition from assembler coding to high-level language coding and then goes on to identify the operating system aspects of a telephone switch. Modern operating system concepts are presented in terms of standard telephone switch func... View full abstract»

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  • A methodological approach to the real-time software design and its use in a PCM toll office

    Publication Year: 1977, Page(s):1335 - 1342
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (854 KB)

    A methodological approach to software development for real-time systems and its application to a stored-program controlled telephone exchange is described. In particular, the problems which arise from the use of a process structure to represent the switching exchange activities are discussed; the method adopted for defining the number and type of processes, the solution given to the synchronizatio... View full abstract»

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  • Processor call carrying capacity estimation for stored program control switching systems

    Publication Year: 1977, Page(s):1342 - 1349
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (914 KB)

    The call processing capacity of a stored program control switching system central processor is defined as the maximum number of calls which can be processed in some fixed interval of time while the processor is meeting all service criteria. The capacity of the processor is seen as a component capacity and thus assumes all other switching machine engineered items are adequately provided so that the... View full abstract»

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  • Signaling systems and technology

    Publication Year: 1977, Page(s):1349 - 1353
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    This paper traces the evolution of the signaling art. From early two-state dc signaling arrangements, equivalent to sophisticated doorbell circuits but completely adequate for the early stages of the telecommunications art, to the ultimate of common channel signaling to meet the ever increasing demands of both customer services and communication networks control is discussed. The advantages and di... View full abstract»

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  • Saturation routing network limits

    Publication Year: 1977, Page(s):1353 - 1362
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (995 KB)

    Saturation routing means a flooding of a network with messages which search for a particular subscriber's number without regard to where that subscriber is located in the network. Saturation routing, often thought of as inappropriate in a communication network, can be a useful routing scheme with the use of state-of-the-art design. In this paper, consideration will be spent on the kinds of network... View full abstract»

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  • Maintenance strategies for PCM circuit switching

    Publication Year: 1977, Page(s):1363 - 1374
    Cited by:  Papers (1)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1023 KB)

    During all the system design phase of an SPC switching system, a considerable effort is devoted to maintenance, both from a hardware and software point of view. The maintenance phases include fault detection, fault analysis (e.g., identification of the faulty security block within the switching system), fault isolation, fault reporting, fault localization, fault clearance, and restoration to servi... View full abstract»

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  • Centralized maintenance and administration of electronic switching systems

    Publication Year: 1977, Page(s):1374 - 1380
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    Centralization of surveillance, control, and analysis of Electronic Switching Systems is gaining wide acceptance throughout the telephone industry as the appropriate approach to maintaining high standards of reliability in a cost-effective manner. This paper discusses some of the major issues confronting the design of systems that support this centralization. These issues include force management ... View full abstract»

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  • Telecommunications circuit switching in a university environment

    Publication Year: 1977, Page(s):1381 - 1386
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    The use of a Stored Program Electronic Switching System (SPESS) in a university program of instruction and research is described. University involvement with telephony in general and telecommunications switching in particular is discussed, the SPESS facility is described, and Rensselaer's program of instruction and research is outlined. View full abstract»

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  • Application of flow graph analysis to noise calculations in multilayered structures

    Publication Year: 1977, Page(s):1391 - 1392
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (226 KB)

    Studies in fields as dissimilar as remote sensing and radio astronomy often require calculation of noise generation and propagation through a multilayered structure. Signal flow graphs are very powerful in the handling of multiple reflections, and in this article is derived the flow graph equivalent source for noise emission in a lossy transmission medium. View full abstract»

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  • Calculation of the fundamental cutoff frequency in a case of waveguides of doubly connected cross section

    Publication Year: 1977, Page(s):1392 - 1395
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (350 KB)

    The lowest cutoff frequency of a circular waveguide with a concentric inner polygonal domain is determined using a conformal mapping variational approach. The results are verified by means of a modified Randall's empirical rule. It is shown that this technique leads also to good relative accuracy in the case of polygonal domains with a concentric circular domain. View full abstract»

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  • On Einsteinian velocity addition and the notion of phase velocity

    Publication Year: 1977, Page(s):1395 - 1396
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (223 KB)

    It is shown that conventional notions of the electromagnetic phase velocity in moving media are in general, inconsistent with the Einsteinian velocity addition. A new vector quantity, normalized phase slowness, is introduced and shown to be consistent with both the Lorentz transformation and the Einsteinian law of velocity addition. View full abstract»

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  • On the realization of a class of linear systems

    Publication Year: 1977, Page(s):1396 - 1397
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    A technique for the realization of linear continuous time-invariant systems from the given transfer function matrix is proposed. View full abstract»

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  • On bounded real lemma in multivariable networks

    Publication Year: 1977, Page(s):1397 - 1398
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    The bounded real lemma for multivariable networks is interpreted in state-space terms. This lemma is useful in the synthesis of networks having lumped transmission line elements. View full abstract»

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  • A comment on the second moment properties of a nonlinear system

    Publication Year: 1977, Page(s):1398 - 1399
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (246 KB)

    This note considers a network consisting of a cascade of three elements: a linear circuit, a zero memory nonlinearity, and another linear circuit. The input is taken to be a Gaussian random process. The effect of the nonlinearity on the second moment properties of the output is analyzed. View full abstract»

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North Carolina State University