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Institution

Deutsche Telekom

CompanyWelwyn Garden City, United Kingdom
About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Terminal (electronics). The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.


Papers
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Journal ArticleDOI
TL;DR: The efficiency of traffic engineering together with simple link upgrade strategies in order to get a maximum throughput is evaluated and a predefined traffic matrix T is taken into account, to scale the traffic matrix by a maximum factor λ max such that the traffic demand can still be carried on the available network resources.
Abstract: IP networks have established as a global telecommunication platform with increasing user population and an extending spectrum of services. The traffic is also steadily increasing, recently driven by peer to peer networking in addition to client server based applications. Network planers and operators have to ensure the scalability of IP platforms in a permanent upgrade process for transmission capacities. At present, Deutsche Telekom and other telecommunication network providers are introducing traffic engineering methods to achieve an optimum resource utilization. In a first step, traffic engineering can be applied to a predefined network topology, but a comprehensive approach has to be coordinated with a process for upgrading the link capacities and has to prepare for relevant failure scenarios. We have evaluated the efficiency of traffic engineering together with simple link upgrade strategies in order to get a maximum throughput. Therefore a predefined traffic matrix T is taken into account. The optimization goal is to scale the traffic matrix by a maximum factor ? max such that the traffic demand ? max T can still be carried on the available network resources. The influence of the network topology on the evaluation results is shown in examples with regard to single link failures.

15 citations

Proceedings ArticleDOI
04 Mar 2012
TL;DR: In this article, a 512-Gb/s dual-carrier DP-16-QAM long haul field trial over 734 km of dispersion compensated SSMF with 10-gbps neighbors is reported.
Abstract: We report on a 512-Gb/s dual-carrier DP-16-QAM long haul field trial over 734 km of dispersion compensated SSMF with 10-Gb/s neighbors. Soft FEC decoding was utilized in the receiver DSP confirming successful transmission.

15 citations

Journal ArticleDOI
TL;DR: The CARMEN architecture introduces an abstraction layer that hides the specifics of the underlying access technology providing an abstract interface on top of which higher layers can be easily developed, which allows for the integration of current and future heterogeneous wireless technologies.
Abstract: CARMEN is a three-year Specific Targeted Research Project (STREP) funded by the European Commission within the 7th Framework Program. The CARMEN access network will complement existing access technologies by exploiting low cost mesh networking techniques, thus minimizing deployment and maintenance costs. The CARMEN architecture introduces an abstraction layer that hides the specifics of the underlying access technology providing an abstract interface on top of which higher layers can be easily developed. This allows for the integration of current and future heterogeneous wireless technologies to provide scalable and efficient mobile ubiquitous Internet access, able to adapt to different environments and user requirements. Following these goals, CARMEN aims to define, study and implement link and technology abstractions, mobility support, and quality of service. The architecture also includes advanced monitoring features that allow for dynamic self-configuration, thereby reducing the installation and operational costs.

15 citations

Journal ArticleDOI
TL;DR: In this article, the characteristics of loss-coupled distributed feedback (DFB) semiconductor laser arrays are investigated both theoretically and experimentally using simulations based on a transfer matrix method.
Abstract: The characteristics of loss-coupled distributed feedback (DFB) semiconductor laser arrays are investigated both theoretically and experimentally. Using simulations based on a transfer matrix method, the strong influence of the residual facet reflectivity on the singlemode yield and the statistical fluctuation of the emission wavelength for as-cleaved and AR/HR coated loss-coupled DFB lasers is pointed out and compared to purely index-coupled /spl lambda//4 phase-shifted devices. Experimental results and the fabrication techniques are given for loss-coupled 1.55 /spl mu/m InGaAs/InGaAlAs/InP DFB laser arrays with four channels and integrated striped thin-film heaters, which were successfully used for fine tuning the channel spacings.

14 citations

Patent
25 Jun 1999
TL;DR: In this article, the safety properties of Java byte code programs are verified using a model checker on a finite state transition system M and the state space of the Java Virtual Machine (JVM) on a set of states in M. The byte code program to be checked is released for further processing only when the state transition systems M fulfills all conditions of conditional set S.
Abstract: In a method for verifying the safety properties of Java byte code programs, the functioning of the byte code program to be verified is modeled on a finite state transition system M, and the state space of the Java Virtual Machine (JVM) on a finite set of states in M. Once entered into a model checker, the data of finite state transition system M are compared to the data entered in the model checker as conditional set S to determine properties characterizing an acceptable byte code program. The byte code program to be checked is released for further processing only when the state transition system M fulfills all conditions of conditional set S.

14 citations


Authors

Showing all 3475 results

NameH-indexPapersCitations
Jörg Müller6740715282
Anja Feldmann6734017422
Yuval Elovici6254414451
Lior Rokach5535719989
Pan Hui5246817724
Hartmut G. Roskos504349643
Wolfgang Haase5062411634
Shlomi Dolev4851610435
Jean-Pierre Seifert452987516
Stefan Schmid455619088
Fabian Schneider441647437
Karsten Buse433947774
Tansu Alpcan432937840
Florian Metze423187148
Christian Bauckhage422858313
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20227
202139
202061
201984
201897