Impact of frequency synchronization on QoS in IP based networks

Rapid development and evolution of IP based networks had major impact on all services and their migration to Next Generation Networks (NGN) infrastructure. Frequency synchronization in this environment was one of the biggest and the most significant challenges, which has to be solved. In traditional circuit-switched networks synchronization problems have been solved using standard plesiochronous digital hierarchy (PDH) and synchronous digital hierarchy (SDH) systems. This paper describes different protocols and techniques used by real-time applications in order to achieve better synchronization degree. For testing and comparing these techniques, we developed our own application in Java programming language, for generating and sending frames through our topology created in virtual environment (MikroTik router OS). This application was also used to process the emulation results, which gave us an insight on the influence of frequency synchronization on Quality of Service (QoS). This paper also discusses an algorithm for frequency synchronization. The aim of this paper is also to compare measured results between the classical synchronization algorithm and the optimized one.