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The circle travelling delay between OLT (Optical Line Terminal) and ONU(Optical Network Unit) is one of most important items in dynamic bandwidthallocation (DBA) algorithms in PON, called RTT (Round Trip Time). The RTT istaken into account when OLT assigns the start times for upstream bandwidthgrants. In most case, RTT is estimated before making bandwidth allocationdecisions in dynamic bandwidth allocation algorithms. If the estimated RTT isincorrect, the bandwidth allocation decisions are not matched with bandwidthrequests of channels. Thus, performance of PON can get worse by deviation ofRTT. There are several reasons that cause the RTT to be varying, such asprocessing delay, distance of OLT and ONU, changing in fiber refractive indexresulting from temperature drift, and degree of accuracy of RTT estimationmethods. In this paper, we evaluate the impacts of RTT inaccuracy onperformance of DBA and identify levels of collision and waste of bandwidth. Bythis way, we propose a method to remedy the performance degradation encounteredby the situation

A Study on Impacts of RTT Inaccuracy on Dynamic Bandwidth Allocation in PON and Solution