This work aims the implementation and analysis of an environment formed by WiMAX and MetroEthernet networks. WiMAX offers unwired broadband access with high capacity of data transmission for dispersed areas. This network allows the interconnection of MetroEthernet networks with connection up to 10Gbps. The study herein presented deals with a proposal of an end-to-end Quality of Service (QoS suitable not only for voice and video traffics but also for data traffic). Until the elaboration of this work, as far as we know, there is not a theoretical and practical study of the characteristics of real time traffic in WiMAX interconnecting Metro Ethernet networks.