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After the birth of mobile networks and the Internet of things (IoT), the focus of the new generation of mobile communications is moving towards appending haptic information to traditional audiovisual multimedia. This will extremely demand an ultra-low latency with high availability, reliability and secure networks, which is referred to as the Tactile Internet. In the frame of preparing the adequate infrastructure for haptic communications, that play a major role in Tactile Internet, this article estimates several key performance indicators (KPIs) such as jitter, end-2-end delay, throughput and packet loss through simulations of different networks backbones (Wi-Fi, 3G and WiMAX) using Riverbed modeler. These KPIs help us evaluate the network's performance, taking into consideration the distance from users to the access point, the different types of applications as well as their minimum Quality of Service (QoS).