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Communications Magazine, IEEE

Issue 7 • Date July 1995

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Displaying Results 1 - 9 of 9
  • Introduction of modern telecommunications equipment in Russia and the New Republics

    Publication Year: 1995 , Page(s): 94 - 99
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2157 KB)  

    We describe the process of introducing new equipment for the telecommunications networks of the former USSR, taking into account our personal experience. First, it is important that we are dealing mainly with local switching, so the examples discussed are mainly from this particular field. Today the former Soviet Union is still a united country from the point of view of telecommunications (and telephony in particular). Though different countries have gained their independence, the telephone network is still united and built according to the same technical standards and regulations. In all the new countries; local calls are not billed as yet and additional services are virtually nonexistent, so it is impossible to generate revenue providing them. Local administrations need to install new equipment in order to upgrade their services, thus making it possible to earn more income from users. The three main sources of income are: installation and subscriber fees; payments on a per-call or per-time-unit basis; and payments for services and special features. Currently, the Republic's administrations are trying to increase the first item, which can be achieved by upgrading the old electromechanical switches and the analog network.<> View full abstract»

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  • Dynamic routing in the multiple carrier international network

    Publication Year: 1995 , Page(s): 54 - 61
    Cited by:  Papers (5)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1276 KB)  

    Presents an overview of the efforts of the 13 participating carriers that comprise the Worldwide Intelligent Network (WIN) Dynamic Routing Group to introduce dynamic routing internationally. The authors propose that the introduction of dynamic routing could be accomplished in stages, starting with the deployment of flexible overflow routing for bilateral networks. Then the authors examine performance feasibility issues associated with multiple carrier transit routing and analyze data items that need to be exchanged by international carriers to realize dynamic traffic control. They also review major conclusions that can be made based on the results of the first WIN dynamic routing trials. Finally, they review a proposal for standardization of certain signaling messages that enables the realization of real-time state-dependent routing in a multiple carrier environment View full abstract»

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  • Dynamic network evolution, with examples from AT&T's evolving dynamic network

    Publication Year: 1995 , Page(s): 26 - 39
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2932 KB)  

    Dynamic network evolution achieves network performance improvement and cost reduction by taking advantage of new advanced technologies being introduced into the network to achieve greater network flexibility and efficiency. The author describes the evolution of dynamic networks, with examples drawn from the AT&T DNHR network deployed in the '80s and RTNR network deployed in the '90s. Dynamic traffic routing implements an integrated class-of-service routing feature for extending dynamic routing to emerging services, and provides a self-healing network capability to ensure a network-wide path selection and immediate adaptation to failure. Dynamic traffic routing brings benefits to customers in terms of new service flexibility and improved service quality and reliability, at reduced cost View full abstract»

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  • Dynamically controlled routing in networks with non-DCR-compliant switches

    Publication Year: 1995 , Page(s): 48 - 52
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB)  

    The authors investigate the deployment of a state-dependent call routing scheme in a network where only a fraction of the switches can fully support it. The state-dependent routing scheme considered is dynamically controlled routing (DCR). Not all switches are assumed to be capable of supporting the feature that DCR requires. For switches that cannot support DCR, several alternative routing schemes are considered. These are: FHR, fixed routing (FR), and adaptive controlled routing (ACR). These schemes were selected on the basis of their modest switch requirements, which can be expected to be satisfied with no or minimal new development by the vast majority of existing switch products. The objective in the article is to define feasible interworking arrangements between DCR and these schemes and assess the performance that can be expected of a network operating under these arrangements. The authors begin by discussing DCR, and describe how it can be enhanced to interwork with non-DCR switches. They describe the routing schemes considered for the non-DCR switches, and how they can interwork with DCR. After that they analyze the performance that a network can expect to achieve when it supports DCR in its DCR switches in conjunction with one of the other routing schemes in its non-DCR switches View full abstract»

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  • Improved survivability with multi-layer dynamic routing

    Publication Year: 1995 , Page(s): 62 - 68
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1564 KB)  

    The article deals with the integrated design and analysis of a telecommunications network to achieve specified levels of survivability under various failure modes and conditions. The main goal of the article is: given a criterion for network survivability, develop a unified theory for network planning at different “layers” of the network, and for coordinated restoration methods after a failure. While most of the discussion relates to modern circuit-switching architectures, for completeness, asynchronous transfer mode technology is also considered View full abstract»

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  • A fuzzy control approach for adaptive traffic routing

    Publication Year: 1995 , Page(s): 70 - 76
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1128 KB)  

    The application of fuzzy control to adaptive traffic routing in telephone networks is investigated. The authors use, on one hand, the properties of fuzzy control techniques and adaptive routing, on the other hand, to derive a routing system that is robust and efficient. They analyze the impact of various availability indicators on performance, which indicates that the choice of a suitable indicator must be made to characterize circuit group availability. When used in the fuzzy control framework the indicator used appears clearly to improve the performance of the routing algorithm as compared to existing routing systems. On the other hand, the use of this indicator in a classical way appears to be of poor utility. The study compares the performance of methods usually applied to adaptive traffic routing and the fuzzy control approach and shows that the fuzzy control approach could provide an effective framework for robust control of traffic routing in communications networks. Research studies still need to be carried out to develop fuzzy adaptive routing on different network structures and to evaluate its impact on performance View full abstract»

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  • State- and time-dependent routing in the NTT network

    Publication Year: 1995 , Page(s): 40 - 47
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2172 KB)  

    The purpose of state- and time-dependent routing (STR) is to achieve high performance despite unpredictable real-time traffic fluctuations, with minimum changes to existing switching software and operations systems. STR uses an appropriate combination of the two kinds of control, centralized and distributed. The article gives an overview of STR and its advanced call-level routing, describes the current STR network and the performance of STR with two examples from the NTT network, and addresses a dimensioning method for STR View full abstract»

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  • Telecommunications in Lithuania

    Publication Year: 1995 , Page(s): 86 - 92
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    According to Lithuania's Master Plan, further development of the country's telecommunications infrastructure must be concentrated on modern digital technology, most of it produced in Western countries. The Master Plan is divided into three parts. First, it is a short term plan that covers the development of telecommunication systems with high priority, and covers the period through the end of 1997. Another goal stated in the Master Plan is to have 48 main lines per 100 inhabitants by the year 2005. In addition, the Ministry decided to issue one license for operating a national paging network in 1995. This network must cover most of Lithuania. The number of licenses for local paging networks will not be limited View full abstract»

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  • Evolution of telecommunications in Russia

    Publication Year: 1995 , Page(s): 78 - 85
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1596 KB)  

    The current status of Russia's telecommunications infrastructure does not correspond to the country's increasing demands. The creation of a commercial digital overlay network is apparently the only possible solution to provide modern telecommunications services. This article describes the following aspects of the evolution of telecommunications in Russia: a classification of the main specific features of the existing telecommunications networks; an analysis of the telecommunications statistics and forecasting of the main characteristics; likely future scenarios of the evolving telecommunications system; and the main telecommunications projects that will be carried out in the nearest future. Until now, the public switched telephone network (PSTN), a unique system providing basic dialogue services (speech, data transmission, etc.), was the single solution to provide national telecommunications. For this reason, we first describe the main features of the Russian national PSTN 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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Huawei Technologies