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Temperature Dependence of PMD
Drábek, Jakub ; Hanák, Pavel (referee) ; Münster, Petr (advisor)
Bacherol thesis describes the problems of polarization mode dispersion-PMD. Size of the delay PMD is a random variable that varies in time. When operating at high data rate communication links is one of the major problem of the optical fiber. PMD value affects many different environmental influences as temperature, and therefore the measurement of PMD become standard in deploying high-speed optical networks.
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Possibilities of QoS algorithms simulation and optimization
Charvát, Ondřej ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
The bachelor's thesis deals with problematics of data transmission control in converged networks which is implemented there to offer telecommunication services in desired quality. Theoretical part of the thesis provides an overview of measurable parameters and lists factors by which they are affected. It discusses different levels of services offered and finally techniques used for it's provisioning as they are implemented in network appliances. In practical part a model of network with QoS implementation is constructed in simulation software Simulink. There are several traffic flows running in the simulated network which has different demands on transfer quality such as telephony or bulky file transfer. There is graphical user interface programmed in Matlab enviroment by which it is possible to alter QoS settings in the model and observe effect on achieved parameters of running data transfers. All simulation results are also displayed on the user interface. User may set all parameters manualy or let the software optimize settings according to prefered criterion, i.e. packet loss. In such way model demonstrates how changes in QoS configuratinon affects quality of services being transferred. The whole model is constructed in a way to be easily reconfigured in case of future use. It is possible for expample to add more traffic or to extend the model to larger network by using predefined blocks.
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Measurement of communication latency in IP networks
Bednář, Vít ; Vrba, Kamil (referee) ; Komosný, Dan (advisor)
Semestral thesis is focused on measurement of communication delay in networks. There is described creation of individual kinds of delay during the transfer in networks. Tools for measurement of delay are described and web pages are designed and made too. There is measured delay on choose 27 IP address with help of this page.
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Analysis of the communication path attributes for IP geolocation
Rajnoha, Martin ; Komosný, Dan (referee) ; Balej, Jiří (advisor)
The aim of this thesis was to study current resources to find location of stations in the network Internet, mainly active methods that are based on delay measurements. Describe origin of the delay and its parts. Next create an application that is able remotely measure the delay between stations and convert this delay to distance. Aplication calculate geographic position of station on based this distances. For measurement was used experimental network PlanetLab.
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Measurement of influence of network impairments on VoIP call quality
Zelenay, Martin ; Krkoš, Radko (referee) ; Šilhavý, Pavel (advisor)
This work explores, analyzes and rates influence of network impairments on VoIP traffic. It describes how voice over IP is carried according to standards. There are described concepts and basics of VoIP networks with orientation on facts necessary to understand analyzed actions and measurements in theoretical part. In practical part, there is described realization of tests according to instructions with orientation on initial checking of devices and rating models and then measurement of influence of network impairments on quality of calls with use of these devices and Opensource PBX Asterisk.
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Estimate of data strem delay during transit through network device
Dopita, Michal ; Komosný, Dan (referee) ; Verner, Lukáš (advisor)
This thesis is focused on the issue Estimation of delay during the data flow going through network device. There is analyze of network parameters, which influent final delay, detection of delay in data networks and types of delay in the network. The practil part is focused on development of the software, which performs the estimation of delay. At the end there is a summary of the whole thesis and evaluation of measurements.
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Network infrastructure performance analysis
Barniak, Martin ; Verner, Lukáš (referee) ; Krkoš, Radko (advisor)
This thesis deals with analysis of network infrasctructure. It focuses on devices like a switch and router. To analyse a network we usually use resources which are divided into basic and advanced. Basic resources are the most commom like a ping, trace route, netstat, route or arp. The term advanced means network analyzers. Network analyzer is Optixia XM2. Next are described individual key parameters which are dependent on function and reliability of computer network. Thesis describe measurement methods like RFC 2544, RFC 3393 and EtherSAM. The conclusion is devoted to individual measurements and their evaluation.
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Use of optical cable properties for geolocation in the Internet
Chmelař, Jakub ; Verner, Lukáš (referee) ; Komosný, Dan (advisor)
This thesis deals with the IP geolocation which estimates the geographic location of hosts in the Internet network. The knowledge of geographic location can be used both for targeting specific services and information, such as advertisement or weather forecast, and for better utilization of transport network because it is possible to serve content from sources which are located closer to client. The main topic of this thesis is the Speed of Internet geolocation method (SOI), which is an active method based on measurement of latency in network. The theoretical part of the thesis explains how to perform these measurements and briefly describes a few more active geolocation methods. The practical part includes full description of SOI implementation created using Python programming language. This implementation was subsequently used to accomplish a sequence of measurements which allowed accuracy comparison with other geolocation methods. The final part of this thesis evaluates results of these measurements and offers a few possible changes which could improve accuracy of described implementation.
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Open-Source Software Tools for Network Diagnostics
Loffay, Pavol ; Ráb, Jaroslav (referee) ; Matoušek, Petr (advisor)
The aim of this work is to make a research of existing open source tools, which are concerned with the diagnosis of the network transmission in the form of measuring of throughput and other basic parameters. The work is devoted to the construction of methodics for testing and comparing devices between themselves. The result of the work is recommendation to an ordinary customer the right application for measuring of given network transmission parameter.
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A System for Monitoring Status of Network Links via SNMP
Zubčák, Peter ; Trchalík, Roman (referee) ; Rychlý, Marek (advisor)
The goal of the bachelor thesis is an implementation of the system for monitoring status of network links. System collects information from network nodes, from which calculates metrics and statistics, which are available for users in MIB. The communications with network nodes is proceeded by SNMP protocol. The system is implemented in C++ language as a multiplatform service.
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