Distribution of information across IP based networks is today part of our everyday life. IP is the backbone of the Internet and most office networks. We use IP to access web pages, listen to radio, and to create computation clusters. All these examples use bandwidth, and bandwidth is a limited resource. Many applications distribute the same information to multiple receivers, but in many cases the same information is sent to a single receiver at a time, thus multiple copies of the same information is sent, thus consuming bandwidth. What if the information could be broadcasted to all the clients at the same time, similar to a television broadcast. TCP/IP provides some means to do that. For example UDP supports broadcasting; the problem faced when using UDP is that it’s not reliable. There is no guarantee that the information actually reaches the clients. This Bachelor thesis in Computer Science aims to investigate the problems and solutions of how to achieve reliable distribution of fixed size data sets using a non reliable multicast communication channel, like UDP, in a LAN environment. The thesis defines a protocol (Almost Reliable Multicast Protocol – Arm-P) that provides maximum scalability for delivery of versioned data sets that are designed to work in a LAN-environment. A proof-of-concept application is implemented for testing purposes.

The Range Commanders Council has been attempting to standardize Telemetry over IP (TMoIP) for many years now. While the attempt has been valiant, the outcome to date has not been very successful. As a result, many vendors have implemented their own proprietary methods for sending PCM data over IP networks resulting in a lack of interoperability. As telemetry ground stations are finally making the move toward network centric architectures, it is worth considering the lessons learned over the previous 10 years of designing, installing, troubleshooting and optimizing telemetry data distribution over IP networks. This paper describes a proposed revision to IRIG 218 based on these real life experiences. It discusses the critical decisions and architectural decisions to be made and some of the pitfalls to be avoid.

In order to implement wireless sensing and monitoring services at large scale, Internet connection is highly desirable. Particularly, TCP is indispensable for end-to-end connection orientated communication. It is well known that low power and low rate IEEE802.15.4 based Wireless Sensor Networks (WSNs) are vulnerable to the interference from collocated Wireless Local Area Networks (WLAN) utilizing the same un-licensed 2.4GHz frequency band. Such coexistence interference seriously deteriorates the performance of TCP/IPv6 over WSN, resulting in packet losses, disconnections, reduced throughput and so on. This thesis focuses on experimental research on the performance evaluation and improvement of TCP/IPv6 over IEEE 802.15.4 based WSN. In this research, a versatile testbed has been developed and implemented, which consists of off-the-selves and custom built hardware, open source and in-house developed firmware and software. A periodical monitoring/sensing application that uses TCP to transmit data over WSN has been developed and used for performance evaluation when there is various Wi-Fi interference close by. Based on the observations and analysis of our experimental results, several important parameters that impact the TCP packet transmission performance have been identified. Performance improvement technique is proposed to effectively adjust these parameters so as to support periodic monitoring/sensing application with substantial better performance. Extensive experiments have been performed in the testbed to evaluate the performance of WSN packets transmission via TCP over WSN when subjected to different Wi-Fi interference.

This thesis deals with the transmission of information over the Ethernet network. In this work a suitable microcontroller and a communication module were selected. The Module provides data transfer from Ethernet to SPI bus. Furthermore an optimal digital temperature sensor DS1820 was chosen. Theoretically it describes the model TCP / IP and the Ethernet type network . In this thesis a block circuit diagram is created, further an electrical wiring diagram and a printed circuit board were constructed. In the programming environment BascomAVR a program is compiled, which is used to transfer information from the microcontroller via Ethernet to a website.

Within Mater’s Thesis a design of the communication module for X-Plane simulator was worked out. It will enable to read data from simulation model or change current flight situation.

The diploma thesis is focused on the basic properties of network protocols. The main task is to create laboratory tasks that deal with the basic features of network protocols and communication techniques, along with detailed instructions for students of communication technologies. The theoretical part of thesis acquaints the reader with the topic of computer networks and the basic network protocols of the TCP/IP architecture, which occur within the created lab. The practical part contains a selection of testing environment and subsequent description of installation and preparation of selected GNS3 environment. Finally are presented labs, which have been created. First lab deals with the basic differences between TCP and UDP. The second lab is focused on the issue of multicast and the third deals with the basics of penetration testing.

This dissertation deals with the generating of data units at different levels of TCP/IP network model in OPNET Modeler environment. A part of the dissertation is a brief introduction to the simulation environment OPNET Modeler where important components of this comprehensive simulation software are elucidated. The structure of my dissertation reflects individual layers of the model TCP/IP, whereas the function of the process model OPNET Modeler and the data unit used at corresponding levels of TCP/IP is always described. Particular parts of communication models that were created in the simulation environment OPNET Modeler at selected layers of the network model TCP/IP are closely documented in each chapter. Relevant scenarios are described in such a way that they can be later re-arranged by eventual customers.

The aim of this thesis was to get acquainted with the technology of routing data in a computer network. Thesis described in the theoretical level properties of current and past routing protocols and their use in information systems. Based on the acquired knowledge was created a simulation model of network communication in programming environment OPNET Modeler. This model analyzes the received parameters of the current protocols and their subsequent implementation in the real transmission technology using operating system Debian Linux. Finally, the transfer parameters are discussed between the simulation model and real transfer technology.

This thesis deals with the design of three labs in the simulation environment OPNET IT Guru. The first lab demonstrates the differences between the RM OSI transport layer protocols - TCP and UDP. The second lab discusses the role of ICMP protocol and its most famous feature - PING. The third lab is devoted to Application Characterization Environment (ACE) module, which is included in OPNET IT Guru. Theoretical background is provided for all of the mentioned topics. All designed labs can be used to teach at the Faculty of Electrical Engineering and Communication of BUT on subjects dealing with network technologies.

The semestral thesis describes ECG signal compression methods designed to modify the data for transmission via communication channels. The thesis contains an introduction to Ethernet and explanation of communication in the network. The transport protocols TCP and UDP are discussed in more detail. In the practical part of the thesis was created two separate applications. The first application in the sender's computer opens a text file with the ECG signal. Loaded ECG signal is filtered by cascade of filters to eliminate interference. The resulting signal is displayed. A part of the application is the R wave detection, calculating the length of RR interval and heart rate. The application also allows to compress an ECG signal. ECG signal is sent via Ethernet network via UDP protocol for individual samples. Applications in the recipient's computer receives signal samples from the network. Recieved compressed data is reconstructed. The resulting ECG signal is displayed and there are again detected R waves, the length of RR intervals and sampling frequency are calculated.