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Driver design for custom analog user module in Linux OS
Brejcha, Martin ; Sysel, Petr (referee) ; Molnár, Karol (advisor)
This master's thesis describes how to develop loable kernel module for operating system Linux. Module can be use like driver for concrete hardware device. In this case for telecommunication hardware. The second part of this thesis describes how to implement support for this hardware in Asterisk PBX. Support in Asterisk is realized by channel module. In that channel module are implemented functions for process incoming and dialed calls.
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Simulation and evaluation of scenarios running real-time UMTS services in Opnet Modeler environment
Klimeš, Roman ; Molnár, Karol (referee) ; Novotný, Vít (advisor)
This work deals with the Universal Mobile Telecommunications System problems. It researches the parameters of influencing the UMTS Terrestrial Radio Access Network behaviour where is the Quality of Services support necessary. The aim of this master’s thesis is the simulation and evaluation of scenarios running real-time UMTS services in Opnet Modeler environment. In the first part is the short introduction to this technology problem. The requirements and the aims, the frequency plan, the network architecture and the Quality of Services support in UMTS are described. Creating the mobile network in the OPNET Modeler environment, configuration of the particular elements with the correct functionality and finally the parameters configuration for the Quality of Service at all workstations was the practical part of this work. At last phase was needed to compare the final statistics of the model without QoS support and the model with QoS support. I verified my knowledge in the OPNET Modeler program and the expected simulation results were confirmed. The final part of the thesis was creating the laboratory problem on the basis experience gained.
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Functionality verification of GRP routing protocol in OPNET Modeler environment
Kováč, Dominik ; Růčka, Lukáš (referee) ; Molnár, Karol (advisor)
The bachelor's thesis "Functionality verification of the routing protocol GPR in the OPNET Modeler environment" focuses on MANET networks question and deals with routing processes in these networks. This thesis includes a theoretical analysis of the GRP routing protocol. Furthermore, there is a step-by-step creation of a MANET simulation model with GPR routing protocol in OPNET Modeler and its subsequent simulations to verify the functionality of the Protocol itself, its parameters and the extension of the hello paket by custom parameter.
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Network data traffic analysis and modeling
Šabatka, Zdeněk ; Molnár, Karol (referee) ; Růčka, Lukáš (advisor)
This bachelor's thesis is focused on analysis of network traffic and its modeling. In the thesis, there are described various methods of traffic modeling, both current and modern, and historical, for contemporary traffic inconvenient. The first part is focused on the theoretical analysis of these models, there are also mentioned basis formulas. In the second part, practical, there is capcured real WWW traffic. In the last part, that real network traffic is modeled using Markov model.
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Comparison of architectures of MIB system databases designed for QoS management in data networks
Jelínek, Tomáš ; Hošek, Jiří (referee) ; Molnár, Karol (advisor)
Bachelor thesis deals with Diffserv mechanism for Quality of Service in data network and goes through several parts of structure MIB database for managing Diffserv mechanism. The first chapter is introduction. I explain SNMP protocol in the second chapter. In the third chapter I deal with Quality of Service (QoS) and in the next chapter I explain Diffserv mechanism and its architecture. In fifth chapter I present possibilities of using Policy Information Base (PIB). I show several parts of MIB database in the sixth chapter. I compare two parts of MIB database and summary whole work in the last chapter.
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Simulation of QoS models in Opnet IT Guru environment
Zapletal, Lukáš ; Molnár, Karol (referee) ; Kacálek, Jan (advisor)
The main goal of this work is description and following simulation of operating with support of QoS technology in OPNET IT Guru programme. The bachelor’s work contains a theoreticall description of providing the quality of service by force of integrated and differentiated services models and also of the MPLS protocol. The work is particularly focused on IntServ model and its reservation with assistance of the RSVP protocol. The simulation in OPNET IT Guru programme has also been included in the work. Process for constituent parameters setting-up and its characterization for both the models are described thoroughly in work’s supplement. As for the differentiated services, the simulation is performed by confrontation of a voice service in two scripts. In case of differentiated services the mechanisms for tagging of packets and the treatment method have been demonstrated on inside and border routers. Operating types are simulated in ftp, e-mail and voice applications. Verification of authenticity and validity results of objects setting-up is being performed by simulation in OPNET IT Guru environment, Academic Edition version 9.1. Grafical results have also been gained by the simulation.
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Application of TCP in OPNET Modeler simulation environment
Tirinda, Viktor ; Kubánková, Anna (referee) ; Molnár, Karol (advisor)
This diploma thesis describes a possibility of application protocol implementation in OPNET Modeler simulation environment. It presumes that this application protocol is going to use TCP protocol for their communication on transport layer. The first part of thesis is focused on a description of TCP. It is a connection oriented, reliable and confirmed protocol which maintains sequence of transmitted data. This data is after receiving positively confirmed. In the second chapter are described the main functions of OPNET Modeler simulation environment. OPNET is hierarchical divided into four editors. Each editor has a specific function by creating a network and setting his behavior. There is also focused on the two lowest layers of OPNET Modeler and their components in detail, which are participating at usage TCP on transport layer to communication. Implemented applications communicate by sockets, which are created and destroyed on request. Communication is controlled by manager process, whose function is maintenance particular connections and redirect dataflow into relevant process. This manager put in action as well a process, which simulates a single TCP. In the practical part I made two applications: one is a client type and a second one is a server type. Both applications are using TCP on transport layer. The establishment of connection initiates a client, who is sending a request to the server for a data. Then server sends back data in desired quantity. After sending the entire data, client terminates the connection. The result of simulation is statistics, where we pictured the size of the transferred data, a number of transferred packets and other parameters typical for TCP.
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Probability-based model for network traffic
Bednár, Peter ; Jelínek, Mojmír (referee) ; Molnár, Karol (advisor)
This work identifies several basic types of traffic in IP networks and describes main features. The basic network services such as HTTP, VoIP and electronic mail are discussed focusing mainly on HTTP and VoIP probability-based models for network traffic which are applied to the software simulation of real network.
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Graphical user interface for probabilistic modelling of WLAN wireles networks
Stecík, Július ; Molnár, Karol (referee) ; Rajmic, Pavel (advisor)
Course includes functions to access the shared medium, DCF, PCF and HCF. In detail, then describes the EDCA method for accessing the shared medium. The thesis focuses on the probabilistic model of competing stations to access the wireless medium and mathematics and algorithms needed to calculate these probabilities. The last part also design and description of user interface in the form of a Java applet to compute the probability that the station win the competition or on a shared medium collision occurs. The work also contains a brief commentary on the created program embedded in an HTML file.
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QoS Implementation in Access Network
Adámek, David ; Molnár, Karol (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with computer networks which play a key role in present society. More and more demands are placed on these networks (especially on quality of services and throughput) because of fast-growing developement of services such as voice and video real-time transmissions. All the packets in typical Ethernet networks are equal. Therefore it is sometimes impossible for the application to maintain required throughput speed of a network. For this case it is useful to take some mechanisms into the consideration. These mechanisms (sometimes called QoS) are able to distinguish different types of transmissions and traffic, analyze them and then prioritize them according to some pre-defined set of rules. The most famous mechanisms are Integrated Services and Differentiated Services. The implementation of Differentiated Services is the goal of this thesis.
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