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OTDM to WDM conversion
Kupčiha, Lukáš ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this thesis was introducing the options of conversion between OTDM and WDM technologies. Since this issue is rather extensive, first of all the principle of optical transmission system is described. One chapter presents the effects influencing the optical transmissions. Material absorption, linear and nonlinear scattering and bending losses are mentioned in terms of fiber losses, followed by description of waveguide, chromatic and polarization-mode dispersion of optical fibers. Last part of the chapter presents nonlinear effects, including self-phase modulation, cross-phase modulation and four-wave mixing. The practical part of the thesis deals with multichannel systems. The principles of frequency, space a hybrid multiplexing are explained. Multichannel systems with optical time domain multiplexing and waveguide multiplexing are described in detail and compared. The elements of the transmission chain of multiplex, such as different types of lasers, detectors, modulators, optical amplifiers, splitters, couplers, MUX and DEMUX are discussed. The next part of the thesis was aimed at suggesting the model of mutual conversion between OTDM and WDM systems. First of all, the previously performed experiments concerning the conversion between OTDM and WTM were evaluated. Then the model of OTDM/WDM/OTDM conversion was designed, with explanation of its parts and their function. The general recommendations for practical implementation were are also included. Due to the limited amount of time reserved for access to the simulation program Optsim, the simulations were performed only for certain parts of the proposed conversion model. At the end of the thesis, the proposed model is evaluated.
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Quality of service assurance in IP networks
Kupčiha, Lukáš ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
The aim of this work was introducing the options of configuration mechanisms for quality of service (QoS) in basic network products of Cisco company. The characteristics of the techniques for control and management of bandwidth, delay, jitter and packet loss were examined and explained. The attention was then focused mainly on DiffServ mechanism. Its individual functions, such as classification and marking, traffic rate management and its policing and shaping, congestion management queuing and congestion avoidance, are discussed in detail. Further investigation was aimed at the possibility of QoS implementation on Cisco devices. The basic principles and commands for providing the quality of service were then demonstrated by Cisco MQC. The specific terms, such as traffic class definition, policy definition and policy application, were presented and explained. Consequently, the different scenarios of measurement were proposed and a testing network was designed. Influence of FIFO, PQ, CBWFQ and WRED mechanisms on the network traffic was measured. As a result of the work, the optimal mechanism for providing the quality of service was chosen.
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Quality of service assurance in IP networks
Kupčiha, Lukáš ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
The aim of this work was introducing the options of configuration mechanisms for quality of service (QoS) in basic network products of Cisco company. The characteristics of the techniques for control and management of bandwidth, delay, jitter and packet loss were examined and explained. The attention was then focused mainly on DiffServ mechanism. Its individual functions, such as classification and marking, traffic rate management and its policing and shaping, congestion management queuing and congestion avoidance, are discussed in detail. Further investigation was aimed at the possibility of QoS implementation on Cisco devices. The basic principles and commands for providing the quality of service were then demonstrated by Cisco MQC. The specific terms, such as traffic class definition, policy definition and policy application, were presented and explained. Consequently, the different scenarios of measurement were proposed and a testing network was designed. Influence of FIFO, PQ, CBWFQ and WRED mechanisms on the network traffic was measured. As a result of the work, the optimal mechanism for providing the quality of service was chosen.
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OTDM to WDM conversion
Kupčiha, Lukáš ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this thesis was introducing the options of conversion between OTDM and WDM technologies. Since this issue is rather extensive, first of all the principle of optical transmission system is described. One chapter presents the effects influencing the optical transmissions. Material absorption, linear and nonlinear scattering and bending losses are mentioned in terms of fiber losses, followed by description of waveguide, chromatic and polarization-mode dispersion of optical fibers. Last part of the chapter presents nonlinear effects, including self-phase modulation, cross-phase modulation and four-wave mixing. The practical part of the thesis deals with multichannel systems. The principles of frequency, space a hybrid multiplexing are explained. Multichannel systems with optical time domain multiplexing and waveguide multiplexing are described in detail and compared. The elements of the transmission chain of multiplex, such as different types of lasers, detectors, modulators, optical amplifiers, splitters, couplers, MUX and DEMUX are discussed. The next part of the thesis was aimed at suggesting the model of mutual conversion between OTDM and WDM systems. First of all, the previously performed experiments concerning the conversion between OTDM and WTM were evaluated. Then the model of OTDM/WDM/OTDM conversion was designed, with explanation of its parts and their function. The general recommendations for practical implementation were are also included. Due to the limited amount of time reserved for access to the simulation program Optsim, the simulations were performed only for certain parts of the proposed conversion model. At the end of the thesis, the proposed model is evaluated.
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