H.-M. Foisel

Application of amplitude histograms for quality of service measurements of optical channels and fault identification

A novel method for the characterisation of channel quality is investigated theoretically and experimentally. It is based on the evaluation of amplitude histograms generated by asynchronous sampling. The method enables estimation of the bit error ratio and identification of the source of perturbation.

Global seamless network demonstrator: carrier grade automatic switched transport network implementation in realistic telecom field environment

The Global Seamless Network (GSN) Demonstrator is presented, a joint effort of system vendors and Deutsche Telekom Group R&D to demonstrate network functions and management integration and enable, for the first time, experiences with a carrier grade Automatically Switched Transport Network (ASTN) implementation and the envisaged main ASTN clients, IP and Ethernet. For end-to-end monitoring capability, integrating the view on the ASTN and Ethernet-MAN configuration, an UMS (Upper Monitoring System) is being developed. Furthermore broadband application were implemented to visualise the network functions. The ASTN backbone consists of four cross connects and an ULH-WDM system with 3x 10Gbit/s channels (OCh) between Berlin and Darmstadt, whereby each OCh is treated as a virtual fibre.

8/spl times/2.5 Gbit/s 2340 km transmission experiments over a replica of the Berlin-Darmstadt field transmission line

4/spl times/2.5 Gbit/s, 735/1470 km and 8/spl times/2.5 Gbit/s, 780/156/2340 km WDM transmission experiments over a dispersion compensated 735 km replica of the Berlin-Darmstadt field transmission line were carried out with directly and externally modulated WDM signals.

Interworking achievements in a pan-European ASON/GMPLS multi-domain and multi-layer test network

IST project MUPBED has setup the first pan-European ASON/GMPLS test network based on five heterogeneous network domains and interconnections over the European NREN/GEANT2 networks. Seamless multi-domain interworking solutions and two worldwide first interworking demonstrations have been achieved.