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Multiplatform communication in access networks
Novotný, Bohumil ; Sýkora, Jiří (referee) ; Křepelka, Václav (referee) ; Škorpil, Vladislav (advisor)
Doctoral thesis deals with failure detection methods in wireless access network using distributed stochastic algorithms. A new method of detecting a fault based on the push-sum algorithm has been designed and simulated. Within the scope of the work objectives, the statistical credibility of the average push-sum protocol convergence rate representative and the effect of message loss during the calculation on the robustness of the system using this protocol were compared. Based on the acquired knowledge, the ability of the protocol to mathematically derive deviations from the real average of the values in the specified topology was demonstrated and thereby the existence of an abnormality in the network has been proved or refuted.
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Design of Switch Used in Modern Communication Networks
Mojžiš, Ľubomír ; Novotný, Bohumil (referee) ; Škorpil, Vladislav (advisor)
This diploma thesis deals with switching components of modern communication networks. A switch architecture focused on the quality of service is described in this paper and there are two switch models designed and simulated in the simulating program MATLAB-SIMULINK. The first model is based on classic switching and the other one is controlled by neural network. A laboratory exercise suitable for communication networks education is created in this paper on the basis of designed models.
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Multiplatform gateway for voice communication in real-time
Starzyczny, Radek ; Krkoš, Radko (referee) ; Novotný, Bohumil (advisor)
This master's thesis is focused on VoIP communications. It describes deploy of the operating system OpenWRT, analog interface of router Gigaset SX762 and GSM gateway for receiving or place calls. The paper describes the protocols involved in the communication and basic configuration elements. Deploying IP telephony enables to reduce the cost of operation and provides a number of additional functions.
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High-speed Networks Analysis Using Load Tester
Yarmolskyy, Oleksandr ; Novotný, Bohumil (referee) ; Škorpil, Vladislav (advisor)
This thesis describes the design of laboratory tasks for a subject dealing with highspeed networks. The theoretical part describes Gigabit Ethernet, the typical elements in the network, such as switches and routers, RFC 2544 tests and software tools for the implementation of IXIA testing, including IxAutomate, IxExplorer. In the practical part designs are created laboratory exercises aimed at testing different options switches, routers and properties of line and network layers. The work tasks and presentations to end configuration settings IXIA programs in the form TCL scripts for each job.
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Preventing attacks 802.11
Štefanec, Filip ; Kenyeres, Martin (referee) ; Novotný, Bohumil (advisor)
The main focus of this bachelor's thesis is on issues with security in wireless networks, based on standard 802.11. It includes description of most used encryption process and authentication methods in 802.11 networks. Also it explains functionality of EAP and RADIUS protocols, which are the main part of WPA/WPA2-Enterprise security mode. At the end of the thesis there is simulation of basic attacks on standard 802.11 and consequently desing and implementation of security, which prevents similar attacks. Implementation of security is based on authentication of clients through RADIUS server.
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Procedure for the application of a high-speed VDSL2 technology
Coufal, Tomáš ; Šilhavý, Pavel (referee) ; Novotný, Bohumil (advisor)
A bachelor thesis sums up the basic line parameter, it deals with VDSL2 technology and G.fast. The work describes its attributes, profiles, masks and also an utilisation of vectoring. There is a comparation with other used technologies in this work. The last part is focused on simulations which are comparing different types of DSL connections and on an influence of vectoring to achievable effective distance.
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Origin And Elimination Of Interference Resulting In Coexistence Of Lte, Dvb-T And Sdars
Novotny, Bohumil
The article deals with emergency of interference on newly licensed frequencies for communication in NGA 4G LTE networks, which are the source of interference with radio and television broadcasters and serves to raise awareness about the problem of interference in access networks. The article deals with the sources of interference to the licensed bands, their origins and finally provides theoretical and applied possibilities of technical solutions interference between licensed bands.
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