ANALYTICAL STUDY OF QoS (Quality of Service) IN THE IMPLEMENTATION OF VOICE COMMUNICATION APPLICATION VoIP (Voice over Internet Protocol) ON THE INTRANET NETWORK AT THE UNIVERSITY OF LAMPUNG

Decline in the quality of a network can be caused by increasing the number of network users. The same case happened on the Unila intranet, quality of intranet degradation will cause packets delayed or even lost. To determine the performance, measurement especially in the implementation voice application. Network performance will be seen from the measurement of QoS (Quality of Service) on the Unila intranet. Network measurement is performed by active measurement with direct measurement to a pre determined scenario and considered to the three parameters: throughput, delay, and jitter by using DITG software. Using UDPprotocol as a protocol for sending voice packets and using three different audio codec at each measurement scenario there are, G.711, G.723.1, and G.729. According to the theory, jitter will increase if delay value is higher. The resulting of jitter and delay value will affect the throughput value. If the jitter and delay value increase, the throughput value will decrease. Research results are not too different from the theory.Throughput value from measurement will be smaller if the jitter and delay value increase. On the Unila LAN,performance of G.711 codec is better than other codec because this codec produces smaller delay and jitter,and the result for throughput is higher than that of other codec