Performance evaluations for the design of the effective voice and data coexisted networks

This paper presents results of QoS performance and QoS performance evaluation of the computer network using VoIP under a voice and data coexisted environment. We simulate two cases, first without QoS and second with QoS; for each case we get a result on the delay and CPU usage. We use several parameters including system operation rate, network protocol, network structure, CPU processing rate, inter-system delay, and the number of buffer failures. The network consists of fast Ethernet. As a result, the CPU processing rates are below 15%. The average inter-system delay is 0.7 ms. In the fast Ethernet network, the average is satisfactory,.