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Mitteilungen des URZ 1/2007Riedel, W., Trapp, H. 04 April 2007 (has links)
Informationen des Universitätsrechenzentrums
mit Jahresrückblick 2006 zu den aktuellen Projekten und
Diensten des URZ
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Mitteilungen des URZ 1/2007Riedel, W., Trapp, H. 04 April 2007 (has links)
Informationen des Universitätsrechenzentrums
mit Jahresrückblick 2006 zu den aktuellen Projekten und
Diensten des URZ:Jahresrückblick 2006
Windows-Softwareausstattung der Computerpools im Sommersemester 2007
Software-News
Kurzinformationen
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Mitteilungen des URZ 4/2007Clauß, Matthias, Müller, Thomas, Riedel, Wolfgang, Ziegler, Christoph, Schmidt, Ronald, Fischer, Günther, Dippmann, Dagmar 03 December 2007 (has links)
Informationen des Universitätsrechenzentrums:Speicherdienste
Unterstützung der Systemplattformen Windows XP, Windows Vista und Scientific Linux
Dienstangebot: VIRTUELLES SERVER HOSTING (VSH)
Campuslizenzverträge
Software-Bedarf in den Pools, Sommersemester 2008
Update Datenbankserver
Neue VoIP-Features
Kurzinformationen: Umstellung Wiki-Server, XWIN-Upgrade auf 5 Gbps
Software-News: Neue Software-Handbücher, Neue Softwareprodukte
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Mitteilungen des URZ01 November 2010 (has links)
Die "Mitteilungen des URZ" informieren die Nutzer des Universitätsrechenzentrums der TU Chemnitz umfassend über neue Dienste und Projekte, vermitteln ggf. Hintergrundwissen und dienen der Berichterstattung.
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Um sistema de conferência centralizada com controle de posse da palavra para educação à distância. / A floor-controlled centralized conference system for distance learning.Smetana, George Marcel Monteiro Arcuri 10 February 2004 (has links)
Este trabalho apresenta um sistema de conferência multiponto centralizada com controle de posse da palavra, que oferece comunicação por voz e por texto, desenvolvido para dar suporte a ferramentas de educação a distância baseadas em tecnologia web. Além do sistema de conferência multiponto, este trabalho introduz, também, conceitos de voz sobre IP (VoIP), codecs de áudio, tráfego de tempo real sobre redes IP, mecanismos de distribuição de pacotes em redes IP, conferências multimídia sobre redes IP, criação e controle de conferências e mecanismos para se controlar a transmissão de pacotes de voz em conferências multiponto, como detecção de atividade de voz (VAD) e controle de posse da palavra. O controle de posse da palavra ou moderação é uma metodologia para coordenar o acesso a recursos de mídia contínua, como os canais de áudio e vídeo em conferências, resolvendo eventuais conflitos e condições de corrida e garantindo o uso exclusivo dos mesmos por um participante da conferência. O controle de posse da palavra é apropriado para a dinâmica de uma sala de aula, onde na maioria das vezes, o professor exerce o papel de um moderador e de principal interlocutor. Além de regular o fluxo de informação na sala de aula virtual, o controle de posse da palavra também ajuda a reduzir a utilização dos recursos da rede. Como principal resultado deste trabalho, uma arquitetura para o sistema de conferência multiponto foi proposta, implementada e testada. Verificou-se que o sistema é escalável e que o controle de posse da palavra reduz o grau de interatividade entre os participantes da conferência, mas funciona eficazmente como mecanismo para reduzir a utilização dos recursos de rede. A comunicação adicional por texto ajuda a reduzir o impacto do controle de posse da palavra no grau de interatividade. Neste trabalho, o uso de uma topologia centralizada para a realização de conferências multiponto mostrou-se bastante vantajoso, principalmente porque o tráfego multicast não era suportado. / This work presents a centralized multipoint conference system with floor control, which offers voice and text communication capability, developed to support distance learning tools based on web technology. This work also brings concepts about voice over IP (VoIP), audio codecs, real-time traffic over IP networks, packet distribution mechanisms in IP networks, multimedia conferences over IP networks, establishment and control of conferences and mechanisms to control voice packets transmission in multipoint conferences, as Voice Activity Detection (VAD) and floor control. Floor control is a suitable methodology for coordinating access to continuous media resources, such as audio and video channels in conferences, solving resource conflicts and race conditions and guaranteeing their mutually exclusive use by one participant of the conference. Floor control is appropriate for the classrooms dynamics, where the teacher, mostly, has the role of a moderator and main talker. Besides regulating the information flow in the virtual classroom, floor control helps reducing the need for network resources. As main result, an architecture for the multipoint conference system was proposed, implemented and tested. It was found that the system is scalable and that floor control reduces the interactivity among the conferences participants, but works efficiently as a mechanism for reducing the need for network resources. Text communications help lowering the impact of floor control on interactivity. In this work, the deployment of a centralized topology for multipoint conferences showed to be very advantageous, mainly because multicast traffic was not supported.
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Um sistema de conferência centralizada com controle de posse da palavra para educação à distância. / A floor-controlled centralized conference system for distance learning.George Marcel Monteiro Arcuri Smetana 10 February 2004 (has links)
Este trabalho apresenta um sistema de conferência multiponto centralizada com controle de posse da palavra, que oferece comunicação por voz e por texto, desenvolvido para dar suporte a ferramentas de educação a distância baseadas em tecnologia web. Além do sistema de conferência multiponto, este trabalho introduz, também, conceitos de voz sobre IP (VoIP), codecs de áudio, tráfego de tempo real sobre redes IP, mecanismos de distribuição de pacotes em redes IP, conferências multimídia sobre redes IP, criação e controle de conferências e mecanismos para se controlar a transmissão de pacotes de voz em conferências multiponto, como detecção de atividade de voz (VAD) e controle de posse da palavra. O controle de posse da palavra ou moderação é uma metodologia para coordenar o acesso a recursos de mídia contínua, como os canais de áudio e vídeo em conferências, resolvendo eventuais conflitos e condições de corrida e garantindo o uso exclusivo dos mesmos por um participante da conferência. O controle de posse da palavra é apropriado para a dinâmica de uma sala de aula, onde na maioria das vezes, o professor exerce o papel de um moderador e de principal interlocutor. Além de regular o fluxo de informação na sala de aula virtual, o controle de posse da palavra também ajuda a reduzir a utilização dos recursos da rede. Como principal resultado deste trabalho, uma arquitetura para o sistema de conferência multiponto foi proposta, implementada e testada. Verificou-se que o sistema é escalável e que o controle de posse da palavra reduz o grau de interatividade entre os participantes da conferência, mas funciona eficazmente como mecanismo para reduzir a utilização dos recursos de rede. A comunicação adicional por texto ajuda a reduzir o impacto do controle de posse da palavra no grau de interatividade. Neste trabalho, o uso de uma topologia centralizada para a realização de conferências multiponto mostrou-se bastante vantajoso, principalmente porque o tráfego multicast não era suportado. / This work presents a centralized multipoint conference system with floor control, which offers voice and text communication capability, developed to support distance learning tools based on web technology. This work also brings concepts about voice over IP (VoIP), audio codecs, real-time traffic over IP networks, packet distribution mechanisms in IP networks, multimedia conferences over IP networks, establishment and control of conferences and mechanisms to control voice packets transmission in multipoint conferences, as Voice Activity Detection (VAD) and floor control. Floor control is a suitable methodology for coordinating access to continuous media resources, such as audio and video channels in conferences, solving resource conflicts and race conditions and guaranteeing their mutually exclusive use by one participant of the conference. Floor control is appropriate for the classrooms dynamics, where the teacher, mostly, has the role of a moderator and main talker. Besides regulating the information flow in the virtual classroom, floor control helps reducing the need for network resources. As main result, an architecture for the multipoint conference system was proposed, implemented and tested. It was found that the system is scalable and that floor control reduces the interactivity among the conferences participants, but works efficiently as a mechanism for reducing the need for network resources. Text communications help lowering the impact of floor control on interactivity. In this work, the deployment of a centralized topology for multipoint conferences showed to be very advantageous, mainly because multicast traffic was not supported.
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Fast Fault Recovery in Switched Networks for Carrying IP Telephony TrafficEisazadeh, Ali Akbar, Espahbodi, Nora January 2010 (has links)
<p>One of the most parts of VOIP management is fault management and, in having a good fault management, finding good mechanisms to detect faults in the network have to be considered.</p><p>The main focus of this project is to implement different types of fast fault recovery protocols in networks<strong>,</strong> especially networks that carry IP telephony. Having a complete understanding of some common link failure detection and fault recovery protocols<strong>,</strong> such as spanning tree protocol (STP), rapid spanning tree protocol (RSTP) and per-VLAN spanning tree protocol (PVSTP)<strong>,</strong> and also having a complete understanding of three other common techniques for fault detection and fault recovery, such as hot standby routing protocol (HSRP), virtual router redundancy protocol (VRRP) and gateway load balancing protocol (GLBP) will be regarded in the project. We are going to test some fault recovery protocols which can be used in IP telephony networks and choose the best. We intend to focus on this issue in LAN environment in theoretical descriptions and practical implementations.</p><p>The final outcome of the thesis is implementation in the Halmstad University’s lab environment to obtain the final result. For doing our thesis, we are going to use some technical tools as hardware tools (Cisco L3 and L2 switches, Routers, IP Phones) and tools which are used for network performance monitoring<strong>,</strong> like as CommVeiw.</p>
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Fast Fault Recovery in Switched Networks for Carrying IP Telephony TrafficEisazadeh, Ali Akbar, Espahbodi, Nora January 2010 (has links)
One of the most parts of VOIP management is fault management and, in having a good fault management, finding good mechanisms to detect faults in the network have to be considered. The main focus of this project is to implement different types of fast fault recovery protocols in networks, especially networks that carry IP telephony. Having a complete understanding of some common link failure detection and fault recovery protocols, such as spanning tree protocol (STP), rapid spanning tree protocol (RSTP) and per-VLAN spanning tree protocol (PVSTP), and also having a complete understanding of three other common techniques for fault detection and fault recovery, such as hot standby routing protocol (HSRP), virtual router redundancy protocol (VRRP) and gateway load balancing protocol (GLBP) will be regarded in the project. We are going to test some fault recovery protocols which can be used in IP telephony networks and choose the best. We intend to focus on this issue in LAN environment in theoretical descriptions and practical implementations. The final outcome of the thesis is implementation in the Halmstad University’s lab environment to obtain the final result. For doing our thesis, we are going to use some technical tools as hardware tools (Cisco L3 and L2 switches, Routers, IP Phones) and tools which are used for network performance monitoring, like as CommVeiw.
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Mitteilungen des URZ 2/2005Blumtritt,, Clauß,, Fischer,, Kempe,, Trapp,, Richter,, Wolf,, Ziegler, 03 May 2005 (has links) (PDF)
Informationen des Universitätsrechenzentrums:
- Die Projekte Campusnetz II und IP-Telefonie (VoIP)
- PROWeb - Ein neuer Dienst für Projekt-WWW-Server
- Unterstützte Linux-Distributionen
- WUSCH - Windows-Update-Service an der TU Chemnitz
- Informationen des URZ zur "Rahmenvereinbarung zum Einkauf von
Standard-PC-Technik"
-Umstellung des Lokalsystems der UB auf LIBERO 5
- Elektronisches Publizieren an der TU Chemnitz - 10 Jahre MONARCH
- Kurzinformationen
- Software-News
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Mitteilungen des URZ 1/2008Riedel, Wolfgang, Richter, Frank 13 March 2008 (has links)
Informationen des Universitätsrechenzentrums mit Jahresrückblick 2007 zu den aktuellen Projekten und Diensten des URZ
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