Monika Pinchas
Ariel Universityl, Israel
Title: PTP Slave Timing Accuracy obtained with the assistant of other PTP slaves in the Network where the PDV is modeled with the Fractional Gaussian Noise
Biography
Biography: Monika Pinchas
Abstract
In modern computer networks time synchronization is critical because every aspect of managing, securing, planning, and debugging a network involves determining when events happen. Time also provides the only frame of reference between all devices on the Network. Without synchronized time, accurately correlating log files between these devices is difficult, even impossible. It is needless to point out that with time synchronization we can distribute frequency via the Network which is needed in the Telecom Industry (it is a requirement from the telco side to allow use of e.g. carrier Ethernet instead of SDH). GPS, NTP (Network Time Protocol) and IEEE1588 v2 (PTP) are the options for time distribution over the Network. PTP is designed for local systems requiring accuracies beyond those attainable using NTP. It is also designed for applications that cannot bear the cost of a GPS receiver at each node, or for which GPS signals are inaccessible. The timing accuracy of the PTP algorithm depends strongly on the packet delay variation (PDV) existing in the Network. Different paths in the Network may lead to lower PDVs thus to improved timing accuracy. In this work we show the timing performance accuracy of the PTP slave where other PTP slaves (all synchronized to the same master) are assisting to the PTP slave timing synchronization task and where the PDV is modeled with the fractional Gaussian noise (fGn) with a Hurst exponent in the region of 0.5