National Repository of Grey Literature 101 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
IoT system for conference room control
Kondás, Peter ; Šilhavý, Pavel (referee) ; Krajsa, Ondřej (advisor)
The goal of this bachelor´s thesis was to design and implement a system for monitoring room occupancy by counting the entries and exits of individuals from the room and chair occupancy detection, with the system sending data using the MQTT protocol. A device was designed for the system and components and sensors were then selected to further expand its capabilities. Home Assistant was used as the user interface for this system, providing a clear representation of the current state of the conference room.
Broadband over powerline modem
Mahút, Michal ; Šilhavý, Pavel (referee) ; Musil, Petr (advisor)
The aim of the diploma thesis is to look into the issues of Broadband Over Powerline Communication, design and construct a BPL modem. The theoretical part of the thesis covers the division and description of Powerline Communication, its standards, and factors affecting communication over electrical wiring. The practical part includes the design of a printed circuit board for the BPL modem with the selection of necessary components for the modem construction. The output of the thesis is a constructed broadband PLC modem, whose transmission properties and interference resistance are compared with commercially available solutions.
Power over Ethernet
Hykš, Matěj ; Šilhavý, Pavel (referee) ; Koton, Jaroslav (advisor)
The bachelor thesis focuses on the topic of powering network elements using Power over Ethernet shortly PoE. The work focuses more in detail on the functions of the 802.3af and 802.3at standards, which are described in detail and explains their functionality on specific examples of PD chips. Then it summarizes the measurement methodology used for 3 devices belonging to the PSE category and 4 devices from the PD category. In both cases, it focuses on their analog and digital communication.
DSL analyzer
Hála, David ; Číž, Radim (referee) ; Šilhavý, Pavel (advisor)
This bachelor thesis is devoted to the development of an application for signal analysis using xDSL technology. The first part of the thesis describes the basics of these tech- nologies and the theoretical assumptions that can be expected in later analysis. Also the parameters measured by the resulting application are explained. The second part of the thesis is devoted to the description of the procedure and solution of the practical part of the thesis - program development. Finally, in the last chapter of the thesis, the program was tested in laboratory conditions and graphs were constructed from the results.
Bonding, the method for increasing DSL data rate
Kratochvil, Tomáš ; Benešl, Lukáš (referee) ; Šilhavý, Pavel (advisor)
This bachelor thesis focuses on characteristics of DSL bonding technology. The basic information about DSL technologies is described at the start of theoretical part of thesis. VDSL2 technology is described more thorougfully in comparision with other DSL technologies, because in this thesis DSL bonding is applied on VDSL2 technology. Next chapter of theoretical part of thesis describes principe of DSL bonding technology. Final chapters of theoretical part of thesis describes recommendations for testing of network characteristics. Specifically these network testing recommendations are described: RFC 2544, RFC 6349 and Y 1564. The results of performed tests are presented in practical part of thesis. Tested DSL technologies are compared based on results of performed tests at the end of practical part of thesis.
Comparison of SIP implementations used in Asterisk and Kamailio open source PBX's
Rajj, Jakub ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
The diploma thesis deals with the comparison and testing of private branch exchanges Asterisk and Kamailo. It also deals with the comparison of stack SIP and PJSIP. At the beginning of the thesis, there is a theoretical part describing private branch exchanges, SIP protocol and PJSIP. In the next section, the tested PBXs Asterisk and Kamailio are described and there is comparison of it´s functions. The private branch exchanges are installed, configured and tests are performed using the Spirent Testcenter C1. The results of the tests were processed into graphs and at the end there is a discussion about the results.
SIP security
Tůma, Petr ; Šilhavý, Pavel (referee) ; Ježek, Jiří (advisor)
This bachelor thesis focuses on security issues of the SIP signalling protocol. The goal was to carry out three attacks and design defences against them. The chosen attacks were a flood attack, a modified message attack and a man-in-the-middle attack. The attacks were conducted against the Asterisk PBX and the results show that some attacks were able to prevent communication between the PBX and clients. Defensive measures are described for each attack in the mitigation subchapter.
Design and implementation of an IMS network with extended functions using Open IMS Core.
Šulgan, Peter ; Šilhavý, Pavel (referee) ; Ježek, Jiří (advisor)
The bachelor thesis focuses on the architecture of the IP Multimedia Subsystem, its main elements and extension functions. It also deals with the implementation of the IMS network in the simulation environment Open IMS Core, which is also briefly described. The first chapter describes the IMS architecture divided into layers and it also defines the basic elements such as CSCF and HSS. In addition, it briefly characterizes the most commonly used communication protocols and the structure of identity in IMS. The second chapter deals with the open source environment Open IMS Core, it briefly defines the individual parts and contains a list of configuration files. The third chapter introduces the additional services offered by the IMS architecture. It characterizes their basic functions and their way of working. The fourth chapter focuses on the practical part of the bachelor thesis. It describes configuration procedure of the Open IMS Core and testing of its functionality. It is divided into four sections according to the individual configuration steps.
Implementation of application that demonstrates mobile application vulnerabilities
Šrůtková, Karolína ; Šilhavý, Pavel (referee) ; Martinásek, Zdeněk (advisor)
This master thesis is focused on an implementation of application for Android operating system that demonstrates mobile application vulnerabilities. Theoretical part contains security of mobile applications and its current state including a description of the biggest security risks and vulnerabilities. In addition, general development of mobile applications for Android is mentioned. In a practical part of the thesis a custom design of the application is described including vulnerabilities analysis, design of basic application blocks and selection of suitable tools for implementation. The section describing the implementation of the application describes the preparation of the environment, the structure of the created application and especially its implementation. The last part contains an example of implemented application vulnerabilities and also the result of its testing.
G.mgfast transmission technology
Rada, Dominik ; Ježek, Jiří (referee) ; Šilhavý, Pavel (advisor)
The master thesis deals with G.fast and G.mgfast transmission technologies, including their parameters. The work deals with the principle of vector DMT modulation and the possibility of time duplex TDD and full-duplex FDX in two-way communication used in these technologies. The following is a description of the line using the KHM model, which is suitable for simulations in the transmission band using G.fast and G.mgfast technologies. Subsequently, the disturbing effects of crosstalk at the near end of NEXT and the far end of FEXT and their elimination with these technologies are discussing. Part of the work explains supporting calculations to determine the SNR and bit allocation to calculate the baud rate. The work describes the methods of compensation of crosstalk FEXT and NEXT, which affect the resulting baud rate. The work also includes an application for simulation of transmission speed as a function of distance for G.fast and G.mgfast technologies, allowing changing input parameters and adjusting the transmission bandwidth based on G.9700 and G.9701 standards. Also, in work, an application is created to display the compensation of the influence of the transmitted signal crosstalk FEXT and NEXT, which allow the import of measured crosstalk between individual participants. The issue of influencing crosstalk for accurate measurements in the laboratory is also discussing. An application in the MATLAB environment is creating to display the measured characteristics.

National Repository of Grey Literature : 101 records found   1 - 10nextend  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.