The paper presents a performance study of wireless MESH networks in the contextof the convergent transmission. Nowadays, the integration of voice, video and data is becoming the norm. However, the wireless LAN environment, and especially MESH technology is an unfriendly environment due to its characteristics. Therefore, the impact of the size of transmitted frames to delays in the network based on mesh technology was analyzed. The sizes of transmitted framescorresponded to standards for Voice over IP, Video over IP that are commonly used. Additionally, a model of effective load balancing in mesh networks was presented. Then, the reliability and flexibility of these networks will be increased.