Analysis of voip traffic in wired and wireless lans

By: Belqasem Almontser

Libyan authority for scientific research

Issue: Vol 22 |First Issue | 2016

article language: English

Abstract:

This paper is an experimental study to analyze the performance of Voice Over IP (VoIP) traffic over wired and wireless Local Area Networks (LANs) by observing VoIP Quality Of Service (QoS) parameters, these parameters comprise jitter, delay and packet loss ratio. Two widely deployed LANs technologies (IEEE 802.3Ethernet in wired and IEEE 802.11G in wireless) are chosen as the test environment to conduct this study, the test methodology adopted in this study is based on simulation of real voice traffic in both network environments, thus the study was conducted in the laboratory using real equipment. In order to evaluate VoIP traffic performance, Quality of Service (QoS) parameters on the Real-Time Transport Protocol (RTP) packet transmission under different background traffic loads are measured, File Transport Protocol (FTP) traffic is used as the back ground traffic. A set of graphs representing the jitter and delay graphs versus the RTP packets number are produced. The test results show that at high network loads, VoIP traffic in both network environments suffers high delay and jitter values. Also it shows that performance of VoIP traffic in wireless is much worse than the performance in Ethernet under the same load conditions. In both Ethernet and wireless, it was noticeable that there is a strong linear correlation between RTP packets delay and packet loss ratio.