Temat: switching networks - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Advanced Considerations Concerning Impact of Applied Call Admission Control Mechanisms on Traffic Characteristics in Elastic Optical Network Nodes
Autorzy:: Głąbowski, Mariusz
Sobieraj, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/27312941.pdf
Data publikacji:: 2023
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: elastic optical networks
frequency slot unit
loss probability
reservation mechanism
threshold mechanism
switching networks
traffic management
Opis:: Over the past few years, a significant increase in network traffic volumes has been observed. The ever growing bandwidth demands mean that a reliable and optimum service level needs to be ensured in communication systems for specific traffic categories. Optimal allocation and use of resources may be achieved through the use of call admission control (CAC) mechanisms implemented in network systems. The resource reservation mechanism and the threshold mechanism are two of the most popular CAC methods. In the reservation mechanisms, a certain number of resources is reserved for selected (predefined) services only. In the case of threshold mechanisms, the number of resources allocated to individual traffic classes depends on the network load. This article discusses the results of simulations verifying the impact of applied CAC mechanisms on the traffic characteristics in elastic optical network (EON) nodes with a Clos structure. Loss probability results obtained with the use of the simulator are presented as well.
Źródło:: Journal of Telecommunications and Information Technology; 2023, 4; 68--75
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Combinatorial Properties and Defragmentation Algorithms in WSW1 Switching Fabrics
Autorzy:: Rajewski, Remigiusz
Kabaciński, Wojciech
Al-Tameemi, Atyaf
Powiązania:: https://bibliotekanauki.pl/articles/227184.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: elastic optical network
switching networks
rearrenging algorithm
defragmentation algorithm
Opis:: A spectrum defragmentation problem in elastic optical networks was considered under the assumption that all connections can be realized in switching nodes. But this assumption is true only when the switching fabric has appropriate combinatorial properties. In this paper, we consider a defragmentation problem in one architecture of wavelength-space-wavelength switching fabrics. First, we discuss the requirements for this switching fabric, below which defragmentation does not always end with success. Then, we propose defragmentation algorithms and evaluate them by simulation. The results show that proposed algorithms can increase the number of connections realized in the switching fabric and reduce the loss probability.
Źródło:: International Journal of Electronics and Telecommunications; 2020, 66, 1; 99-105
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Rearrangeability of 2×2 W-S-W Elastic Switching Fabrics with Two Connection Rate
Autorzy:: Kabaciński, W.
Rajewski, R.
Al-Tameemi, A.
Powiązania:: https://bibliotekanauki.pl/articles/307745.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: elastic optical networks
elastic optical switching nodes
interconnection networks
rearrangeable non-blocking conditions
Opis:: The rearreangeable conditions for the 2×2 three-stage switching fabric of a W-S-W architecture for elastic optical switches are considered in this paper. Analogies between the switching fabric considered and the three-stage Clos network are shown. On the other hand, differences are also shown, which presented the modifications required in the control algorithm used in rearrangeable networks. The rearrangeable conditions and the control algorithm are presented and proved. Operation of the proposed control algorithm is shown based on a few examples. The required number of frequency slot units in interstage links of rearrangeable switching fabrics is much lower than in the strict-sense non-blocking switching fabrics characterized by the same parameters.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 1; 11-17
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: SMM Clos-Network Switches under SD Algorithm
Autorzy:: Kleban, J.
Warczyński, J.
Powiązania:: https://bibliotekanauki.pl/articles/307990.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: clos-network switch
packet dispatching algorithms
packet switching networks
stability of switching network
Opis:: This paper is devoted to evaluating the performance of Space-Memory-Memory (SMM) Clos-network switches under a packet dispatching scheme employing static connection patterns, referred to as Static Dispatching (SD). The control algorithm with static connection patterns can be easily implemented in the SMM fabric due to bufferless switches in the first stage. Stability is one of the very important performance factors of packet switching nodes. In general, a switch is stable for a particular arrival process if the expected length of the packet queues does not increase without limitation. To prove the stability of the SMM Clos-network switches considered under the SD packet dispatching scheme the discrete Markov chain model of the switch is used and Foster’s criteria to extend Lyapunov’s second (direct) method of stability investigation of discrete time stochastic systems are used. The results of simulation experiments, in terms of average cell delay and packet queue lengths, are shown as well.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 1; 24-31
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Recurrent Method for Blocking Probability Calculation in Switching Networks with Overflow Links
Autorzy:: Głąbowski, M.
Stasia, M. D.
Powiązania:: https://bibliotekanauki.pl/articles/307836.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: intersection links
switching networks
Opis:: This article presents a new recurrent method for modelling multi-service switching networks with overflow links. In the proposed method, the blocking probability for a given stage of the switching network is determined on the basis of the characteristics of the preceding stage. A particular attention is given to a possibility of a considerable reduction of the internal blocking probability of the switching network that would result from an application of additional overflow links between neighbouring switches of the first stage of the network. The results of the analytical modelling of selected multi-service switching networks with overflow links in the first stage are compared with the results of the simulation experiments. The study confirms the accuracy of all the adopted theoretical assumptions in the proposed analytical model of the multi-service switching network.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 1; 56-64
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Forecasting the Polish Zloty with Non-Linear Models
Autorzy:: Rubaszek, Michał
Skrzypczyński, Paweł
Koloch, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/483367.pdf
Data publikacji:: 2010-11-03
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: exchange rate forecasting
Polish zloty
Markov-switching models
artificial neural networks
Opis:: The literature on exchange rate forecasting is vast. Many researchers have tested whether implications of theoretical economic models or the use of advanced econometric techniques can help explain future movements in exchange rates. The results of the empirical studies for major world currencies show that forecasts from a naive random walk tend to be comparable or even better than forecasts from more sophisticated models. In the case of the Polish zloty, the discussion in the literature on exchange rate forecasting is scarce. This article fills this gap by testing whether non-linear time series models are able to generate forecasts for the nominal exchange rate of the Polish zloty that are more accurate than forecasts from a random walk. Our results confirm the main findings from the literature, namely that it is dificult to outperform a naive random walk in exchange rate forecasting contest.
Źródło:: Central European Journal of Economic Modelling and Econometrics; 2010, 2, 2; 151-167
2080-0886
2080-119X
Pojawia się w:: Central European Journal of Economic Modelling and Econometrics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Performance Comparison of Protection Strategies in WDM Mesh Networks
Autorzy:: Singh, H. K.
Aggarwal, S.
Singh, S.
Mohapatra, B.
Nagaria, R. K.
Tiwari, S.
Powiązania:: https://bibliotekanauki.pl/articles/308073.pdf
Data publikacji:: 2010
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: blocking probability
protection
survivability
switching time
WDM networks
Opis:: Recent development in optical networking employing wavelength division multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Protection is one of the key techniques, which is used in designing survivable WDM networks. In this paper we compare dedicated and shared protection strategies employed inWDMmesh networks to protect optical networks failure, particularly fiber failure. Dijkstra's shortest path algorithm is considered for carrying out simulations. The paper compares the performance of protection schemes, such as, dedicated path protection (DPP), shared path protection (SPP) and shared link protection (SLP) schemes. Capacity utilization, switching time and blocking probability are the parameters considered to measure the performance of the protection schemes. Simulation results show that, SPP is more efficient in terms of capacity utilization over DPP and SLP schemes, whereas, SLP offered better switching time than both DPP and SPP schemes. The average call drop rate is minimum for shared path protection scheme and maximum for shared link protection scheme.
Źródło:: Journal of Telecommunications and Information Technology; 2010, 1; 62-69
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Sensorless DTC of induction motor using improved neural network switching state selector controller
Autorzy:: Messaif, I.
Berkouk, E. M.
Saadia, N.
Powiązania:: https://bibliotekanauki.pl/articles/229864.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: direct torque control
NPC three-level inverter
switching table
neural point potential
neural networks
induction motor
Opis:: The paper deals with development of sensorless Direct Torque Control (DTC) system based on neural network. This network is built to solve the task of proper switching states selection based on information about electromagnetic torque and stator flux (position and magnitude) of induction motor. In fact, this technique which uses conventional switching table is not convenient for one-line and real time control for its high computation time. In order to avoid this problem a solution based on neural network is proposed. Well trained Artificial Neural Network structure can replace successfully the switching table. However, in the Neutral-Point-Clamped topology, it has an inherent problem of Neutral Point Potential (NPP) variation. In this way, a Neural Network-Direct Torque Control technique has been applied and the estimated value of the Neutral Point Potential is used, which is calculated by motor currents. This control strategy offers the possibility of selecting appropriate switching state to achieve the control of Neutral Point Potential. Simulation results verify the validity of the proposed method.
Źródło:: Archives of Control Sciences; 2010, 20, 4; 435-456
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Multistage optical switching networks
Autorzy:: Kaczmarek, S.
Powiązania:: https://bibliotekanauki.pl/articles/309271.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: optical matrix
optical switching networks
electronic switching networks equivalent
connection properties
Opis:: The backbone networks evolution to high-speed DWDM networks generates new problems for switching. This function element must be also based on optical technology. For large capacity this cannot be realized by a single matrix, but by multistage switching networks. In the paper three types of optical matrices have been described: fiber switch FX, wavelength fiber switch WSX and wavelength interchanging fiber switch WIX. Based on these matrices, four switching network constructions were considered. The connection properties of these switching networks were evaluated, determining the electronic equivalent switching network for which these properties are well known.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 21-25
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Trendy w ewolucji sieci inteligentnej
Trends in evolution of intelligent network
Autorzy:: Gajewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/317424.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: sieć inteligentna
sieć sygnalizacyjna
systemy komutacyjne
intelligent networks
signalling systems
switching systems
Opis:: Scharakteryzowano kierunki rozwoju sieci inteligentnej na podstawie dokumentów normalizacyjnych zestawu usługowego CS-2 (Capability Set 2) oraz planów i propozycji dostawców rozwiązań sprzętowych. Szczególną uwagę zwrócono na procesy adaptacyjne struktury sieci inteligentnej do świadczenia usług dodatkowych przez operatorów sieci komórkowych (koncepcja CAMEL).
The paper describes directions of intelligent networks evolution. The analysis is based on the latest issues of standardization documents defining the Capability Set 2 and contains proposals of solutions offered by suppliers. The main adaptation trends of IN to mobile networks are underlined and an example of implementation of IN functionality in mobile network based on ETSI CAMEL standard is given.
Źródło:: Telekomunikacja i Techniki Informacyjne; 2001, 1; 51-58
1640-1549
1899-8933
Pojawia się w:: Telekomunikacja i Techniki Informacyjne
Dostawca treści:: Biblioteka Nauki

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