Steinau an der Strasse, Germany
Steinau an der Strasse, Germany

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Katzorreck H.M.,TU Berlin | Heger T.,EICT GmbH | Schlesinger M.D.,EICT GmbH
10th Conference of Telecommunication, Media and Internet Techno-Economics, CTTE 2011 | Year: 2011

This paper explores which network access technology German housing associations currently use and plan to use in the future. Various alternatives exist, for example fiber to the cabinet (FTTC), fiber to the building (FTTB) and fiber to the home (FTTH). To date, a standard access did not emerge. Major findings of our case studies show that housing associations plan large-scale upgrades to today's infrastructure, i.e. they recognize advantages of high-speed access for their tenants. Instead of working autonomously, they prefer to work with external providers who build, run and maintain fiberglass infrastructures. Currently, housing associations mostly collaborate with cable network providers when re-engineering their network. © VDE VERLAG GMBH, Berlin, Offenbach.


Sune M.,I2CAT Foundation | Bergesio L.,I2CAT Foundation | Woesner H.,EICT GmbH | Rothe T.,EICT GmbH | And 14 more authors.
Computer Networks | Year: 2014

The growth of the Internet in terms of number of devices, the number of networks associated to each device and the mobility of devices and users makes the operation and management of the Internet network infrastructure a very complex challenge. In order to address this challenge, innovative solutions and ideas must be tested and evaluated in real network environments and not only based on simulations or laboratory setups. OFELIA is an European FP7 project and its main objective is to address the aforementioned challenge by building and operating a multi-layer, multi-technology and geographically distributed Future Internet testbed facility, where the network itself is precisely controlled and programmed by the experimenter using the emerging OpenFlow technology. This paper reports on the work done during the first half of the project, the lessons learned as well as the key advantages of the OFELIA facility for developing and testing new networking ideas. An overview on the challenges that have been faced on the design and implementation of the testbed facility is described, including the OFELIA Control Framework testbed management software. In addition, early operational experience of the facility since it was opened to the general public, providing five different testbeds or islands, is described. © 2014 Elsevier B.V. All rights reserved.


Schmuck H.,Alcatel - Lucent | Bonk R.,Alcatel - Lucent | Poehlmann W.,Alcatel - Lucent | Haslach C.,Alcatel - Lucent | And 8 more authors.
Optics Express | Year: 2014

An open converged metro-access network approach allows for sharing optical layer resources like fibers and optical spectrum among different services and operators. We demonstrated experimentally the feasibility of such a concept by the simultaneous operation of multiple services showing different modulation formats and multiplexing techniques. Flexible access nodes are implemented including semiconductor optical amplifiers to create a transparent and reconfigurable optical ring network. The impact of cascaded optical amplifiers on the signal quality is studied along the ring. In addition, the influence of high power rival signals in the same waveband and in the same fiber is analyzed. © 2014 Optical Society of America.


Bentz C.M.,TU Dortmund | Fritzsche D.,EICT GmbH | Weis E.,Deutsche Telekom AG | Krummrich P.M.,TU Dortmund
Journal of Optical Communications and Networking | Year: 2013

Passive optical network (PON) monitoring with as many as 1024 subscribers encounters difficulties due to high splitting losses and drop fiber differentiation problems. In this work a novel concept for monitoring PONs for fiber to the home (FTTH) access, which is based on concatenated wavelength-selective mirrors, has been investigated in a field trial. At each subscriber a unique mirror combinationis installed. Binomial coefficients guarantee that each mirror combination in a given PON is used only once. The field trial has been performed successfully with a PON consisting of 37 km deployed standard singlemode fiber and up to 1:32 passive optical power splitting causing a total one-way attenuation of at least 30.7 dB. Different subscribers located at equal distances from the optical time domain reflectometry could be distinguished and identified individually. For the measurement setup only low-cost components were used. © 2009-2012 OSA.


Kopsel A.,EICT GmbH | Woesner H.,EICT GmbH
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

The demonstration will show the live access to the control framework of a pan-European OpenFlow testbed. The testbed spans five islands all over Europe, allowing experimenters access not only to virtual machines but to the switches interconnecting them. This extends the control of networking experiments beyond best-effort overlays to a real control of the network, its routing and forwarding functions itself. A first video explaining the registration process and the setup of a slice for a new network experiment can be found here: http://www.youtube.com/watch?v=p482T9O9HOg. A tutorial explaining (in short video sequences) the registration and use of the testbed is online on http://www.fp7-ofelia.eu. © 2011 Springer-Verlag.


Toseef U.,EICT GmbH | Pentikousis K.,EICT GmbH
Proceedings - IEEE 4th Symposium on Network Cloud Computing and Applications, NCCA 2015 | Year: 2015

Recent work in software-defined networking experimental facilities has been shifting towards large scale deployments through federation of resources that span across continents and make it possible to perform experiments at a global scale. The success of such deployments very much depends on the design and implementation of essential, secure mechanisms for authentication, authorization, and accounting (AAA) that not only ensure the robustness of such facilities against intrusions and unauthorized use but also ease experimentation and system administration in such complex environments. C-BAS is an initiative in this direction that uses a secure and flexible certificate-based AAA architecture for SDN experimental facilities. Advanced certificate-based authentication and authorization makes C-BAS inherently resilient against attacks specific to traditional AAA mechanisms, increases flexibility and autonomy in experimental facility system administration, and facilitates federation. This article introduces the implementation details of C-BAS, explains its features through use cases, and evaluates its computational performance. © 2015 IEEE.


Fritzsche D.,EICT GmbH | Weis E.,Deutsche Telekom AG | Breuer D.,Deutsche Telekom AG
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

This paper shows the requirements for next generation optical access (NGOA) networks and analyzes the potential of OFDM (orthogonal frequency division multiplexing) for the use in such network scenarios. First, we show the motivation for NGOA systems based on the future requirements on FTTH access systems and list the advantages of OFDM in such scenarios. In the next part, the basics of OFDM and different methods to generate and detect optical OFDM signals are explained and analyzed. At the transmitter side the options include intensity modulation and the more advanced field modulation of the optical OFDM signal. At the receiver there is the choice between direct detection and coherent detection. As the result of this discussion we show our vision of the future use of OFDM in optical access networks. © 2010 COPYRIGHT SPIE - The International Society for Optical Engineering.


Rostami A.,TU Berlin | Jungel T.,EICT GmbH | Koepsel A.,EICT GmbH | Woesner H.,EICT GmbH | Wolisz A.,TU Berlin
2012 IEEE 13th International Conference on High Performance Switching and Routing, HPSR 2012 | Year: 2012

We present the design and prototyping of an OpenFlow-enabled Gigabit Ethernet switch based on an ATCA industrial standard platform. Our work consists of an architectural design for introducing OpenFlow switch functionalities to the ATCA switching platform, design and development of an enhanced library for OpenFlow protocol stack, and porting the data-path functionalities and protocol end-point to the selected platform. We also carry out several performance evaluation tests on the developed switching platform and present selected results. The results demonstrate the successful introduction of OpenFlow protocol to the ATCA platform and contribute, among other things, to the identification of performance bottlenecks and crucial design issues in OpenFlow switches. © 2012 IEEE.


Toseef U.,EICT GmbH | Pentikousis K.,EICT GmbH
Proceedings - 2015 IEEE/ACM 8th International Conference on Utility and Cloud Computing, UCC 2015 | Year: 2015

FELIX, the EU-Japan jointly-funded project, establishes a software defined networking (SDN) experimental facility which spans two continents and several administrative domains via dynamic transit network connections. The FELIX architectural blueprint provides an excellent example where key topics such as policy-based software-defined infrastructure instantiation is supported by resource orchestrators which manage multi-domain distributed compute and network resources including on-demand provisioning of transit network resources. In this context, FELIX implements a modern approach for authentication and authorization in SDN experimental facilities which enables fine-grained control and avoids single points of failure. This paper details the underlying mechanisms for user and transit network resource authentication and authorization in FELIX. © 2015 IEEE.


Zaalouk A.,EICT GmbH | Pentikousis K.,EICT GmbH
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST | Year: 2015

Software-defined networking (SDN) and in particular networks based on an OpenFlow control plane are expected to take significant share in upcoming deployments. Network programmability has emerged as a particularly desirable property for such new deployments, in which logically centralized software will be able to both control and manage operation. This paper focuses on one aspect of network management, namely configuration, in light of the ongoing work in the FP7 ALIEN project to augment a variety of devices with an OpenFlow control plane. In particular, we review management for programmable networks and present how software-defined control can be complemented with software-defined configuration. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2015.

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