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    Wyświetlanie 1-9 z 9
    Tytuł:
    Modeling of Complex Non-Full-Availability Systems
    Autorzy:
    Hanczewski, Sławomir
    Stasiak, Maciej
    Weissenberg, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/309499.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    analytical model
    availability
    non-full availability systems
    Opis:
    This article presents an analytical model of complex non-full-availability telecommunications systems. The high degree of accuracy of the model is demonstrated by a comparison with the results of simulation experiments. Due to the introduction of an availability parameter, this model may be used in the future for analyzing real systems, such as, for example, cloud computing infrastructure. This will be possible provided that the function combining the physical structure of the system and the availability parameter is specified. This problem will be addressed in our future work and will constitute the next stage of research undertaken by the authors.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 2; 70-77
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Availability of WDM Multi Ring Networks
    Autorzy:
    Rados, I.
    Rados, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/309294.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    algebraic
    availability
    multiple
    WDM
    Opis:
    This paper presents a new approach to modeling the availability of the networks composed of multiple interconnected rings in two nodes. For availability modeling method algebraic formulation is used. Using this method, through the availability of multiple ring networks consisting of two and three-rings connected to two nodes, a general expression for the availability between two terminals of multiple ring networks is derived. To perform the expression some real assumptions were taken and the analytical calculation showed that the use of these expressions under these assumptions provides real values for availability between the two terminals of multiple ring networks. Information on the availability of links and nodes is taken from previously published works.
    Źródło:
    Journal of Telecommunications and Information Technology; 2015, 1; 53-58
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Availability analysis and comparison of different WDM systems
    Autorzy:
    Rados, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/308769.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    WDM
    wavelength channel
    availability
    protection
    Opis:
    We begin reasons why high system availability is important. Furthermore, the basic terms are introduced pertaining to the availability with particular review of the parallel structure. Then the availability of different wavelength division multiplexing (WDM) systems is analysed: point to point, chain and ring with 1+1 protection of the wavelength channel, plus the influence of availability of nodes and links on the total system availability. The data on failure intensity and mean time to repair of certain components were taken from various literature sources. We assumed in the analysis a WDM system with 16 wavelengths and 2.5 Gbit/s capacity per wavelength channel. Finally, results of calculation and comparisons of availability of different WDM systems and proposals for improvement of their availability are presented.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 2; 114-119
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Availability Analysis of Different PON Models
    Autorzy:
    Radoš, K.
    Radoš, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/308610.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    availability
    failure
    Passive Optical Network
    protection fiber
    Opis:
    Due to the increasing demands of individual users, Passive Optical Networks (PON) are a promising technology for future broadband access networks. Reliable access to network services is a very important feature, so the availability of the connection is becoming one of the most important requirements. Failure of the optical fiber occurring between the Optical Line Terminal (OLT) and the passive optical splitter can cause the services becoming unavailable for a large number of users, so it is necessary to prevent such an occurrence by providing backup resources – in this case a spare optical fiber. When constructing the spare path (protection fiber), it is important to keep in mind that, if possible, the working and the spare fiber should not be positioned within the same cable. Failure of the optical fiber between the passive splitter and the individual user also means a loss of service for that user. In that case, protection may be offered by adding spare fibers. The question is, however, whether such a solution is cost-effective, as it would lead to a significant cost increase in the construction of the access network. This paper presents the availability analysis conducted for different PON models.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 47-53
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of common path on availability of ring network
    Autorzy:
    Rados, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/308932.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    availability
    failure rate
    protection
    ring networks
    SDH networks
    Opis:
    This paper analyses availability of the ring network which uses the path protection switching (sub-network connection protection - SNCP). Influence of the common path on the ring network availability is analyzed. Data regarding failures of optical fibre cables and equipment used for calculations have been obtained during years-long observation of SDH network in HT Mostar as well as from manufacturers.
    Źródło:
    Journal of Telecommunications and Information Technology; 2004, 3; 71-75
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements and Statistical Analysis for Assessment of Availability of Mobile Network Services
    Autorzy:
    Kadamus, G.
    Langer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308214.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    availability
    Diversity Benchmarker
    Monte Carlo
    quality of experience
    Opis:
    Availability is an essential feature of telecommunication services. It influences the quality of experience (QoE) associated with individual networks and with the services offered. Therefore, it needs to be allowed for at each level of network design, and has to be controlled at the operation stage. This is achieved by means of various mathematical and numerical tools. In this project listening quality and speech level, which are quality-related features of mobile network services, are measured and analyzed with the Monte Carlo simulation method. Measurements are taken with assistance of the Diversity Benchmarker, a reliable device designed for mobile network testing. Finally, results obtained are compared to assess the applicability of the Monte Carlo method.
    Źródło:
    Journal of Telecommunications and Information Technology; 2018, 2; 48-52
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model-Based Availability Evaluation of Composed Web Services
    Autorzy:
    Iacono, M.
    Marrone, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/309381.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    automatic model generation
    Composed Web Services
    fault tree
    model composition
    service availability
    Opis:
    Web services composition is an emerging software development paradigm for the implementation of distributed computing systems, the impact of which is very relevant both in research and industry. When a complex functionality has to be delivered on the Internet, a service integrator can produce added value by delivering more abstract and complex services obtained by composition of existing ones. But while isolated services availability can be improved by tuning and reconguring their hosting servers, with Composed Web Services (CWS) basic services must be taken as they are. In this case, it is necessary to evaluate the composition eects. The authors propose a high-level analysis methodology, supported by a tool, based on the transformation of BPEL descriptions of CWS into models based on the fault tree availability evaluation formalism that enables a modeler, unfamiliar with the underlying combinatorial probabilistic mathematics, to evaluate the availability of CWS, given components availability and expected execution behavior.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 4; 5-13
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The New Analytical Model of Free Resources in the Limited Availability Resources
    Autorzy:
    Nowak, Błażej
    Stasiak, Maciej
    Zwierzykowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27312948.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    analytical modeling
    limited-availability group
    multi-service system
    networks
    Opis:
    The article presents a new analytical model for determining the probability of availability of a certain amount of well-defined free resources (e.g. a link) in a group of dedicated resources (e.g. a group of links) jointly serving a mixture of different classes of multiservice traffic. The presented method can be used to model access to resources in data centers, in particular in the software-defined networks, assuming – for reliability reasons – that the user should have access to a certain minimum number of specific separated resources. The proposed analytical model was verified by appropriate simulation experiments, which confirmed the satisfactory accuracy of the results obtained.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 4; 102--107
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single hysteresis model for limited-availability group with BPP traffic
    Autorzy:
    Sobieraj, M.
    Stasiak, M.
    Weissenberg, J.
    Zwierzykowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/307773.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    hysteresis mechanism
    limited-availability group
    multiservice BPP traffic
    threshold models
    WCDMA radio interface
    Opis:
    This paper presents a single hysteresis model for limited-availability group that are offered Erlang, Engset and Pascal traffic streams. The occupancy distribution in the system is approximated by a weighted sum of occupancy distributions in multi-threshold systems. Distribution weights are obtained on the basis of a specially constructed Markovian switching process. The results of the calculations of radio interfaces in which the single hysteresis mechanism has been implemented are compared with the results of the simulation experiments. The study demonstrates high accuracy of the proposed model.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 3; 89-96
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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