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The paper is focused on evaluating the performances of a WiMAX system in a variety of service scenarios, with particular attention to video applications. To this aim several experiments are carried out over a 2.5 GHz WiMAX test-bed deployed at the radiocommunication laboratories of the University of Rome "Tor Vergata". Throughput and link quality are tested in uplink and downlink in correspondence of different system configuration profiles and WiMAX service classes. Fixed and nomadic access are considered, for coverage ranges up to a few kilometers. The experiments results are presented in this paper.