Kampüs Ağlarında Arkaplan Trafiğin IP-Tabanlı Telefon Sistemlerin Ses Kalitesi Üzerindeki Etkisi

Kampüs ağlarında veri ve IP-telefon tabanlı ses iletimi genellikle aynı ağ altyapısı üzerinde gerçekleştirilmektedir. Ağ ortamında genel anlamda iki farklı trafik ile karşılaşılır. Bunlardan birincisi data ve sesi ifade eden normal akış trafiğidir. İkincisi ise istenmeyen trafik olarak kabul edilen ve IP-tabanlı ses paketlerini olumsuz etkileyen arkaplan trafiğidir. Bu da ister istemez gecikmelere, dalgalanmalara neden olmakta ve nihayetinde paket kayıpları ile sonuçlanmaktadır. Bu çalışmada, ağ konfigürasyonlarından ve torrentlerden kaynaklanan ses bozucu etkenleri incelendi. Ağ cihazlarında tanımlanan VLAN (Sanal ağ) üzerinde ses paketleri taşındı. Böylece sesin kampüs ağında kesintisiz ve daha kaliteli olarak iletilmesi sağlandı. Burada Iperf aracı noktadan noktaya testler için kullanılırken, OPNET simülasyon yazılımı VLAN performansını değerlendirmek için kullanıldı. Kampüsün birden fazla biriminde yapılan testler; ses paketlerine ait dalgalanmaların 0-150 ms aralığında ve ses paketi gecikmelerinin ise 0-20 ms aralığında kaldığını göstermektedir

The Impact of the Background Traffic on the IP-Based Phone Systems Sound Quality in the Campus Network

Data transmission and IP telephony-based sound transmission are carried out via same network infrastructure in campus networks. In general, there are two types of traffics in network environment. The first one is the normal stream traffic which refers to data and sound. The second one is the background traffic which is considered as undesirable traffic and adversely affects IP-based sound packets. This adverse effect leads to delays and fluctuations and finally ends up with packet losses. This study investigates sound scrambling factors which result from network configurations and torrents. We carried sound packet over VLAN (Virtual network) defined in network devices. In this way, we enabled to transmit sound with more quality and without interruption in campus network. While Iperf tool was used for point-to-point tests, OPNET simulation software was used to evaluate VLAN performance. Tests conducted in multiple units of the campus indicate that fluctuations in sound packets remained between the range of 0-150 ms; sound packet delays remained between the range of 0-20 ms

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