Análise de desempenho de protocolos de sincronização de relógios físicos

Abstract

Time has always been a crucial physical quantity in the study of engineering and this is no different in synchronous distributed systems, where each station must be temporally synchronized in the system. A list of protocols are under development by a team of engineers at the Institute of Electrical and Electronics Engineers (IEEE) in order to guarantee the requirements in any time sensitive system based on physical clocks. The purpose of this work is to analyze the performance of two of these protocols: the IEEE 1588-2008 - Precision Time Protocol (PTP) and the IEEE 802.1AS - Generic Precision Time Protocol (gPTP). The performance analysis of these protocols is performed in the open source simulator Objective Modular Network Testbed in C++ (OMNeT++). Two simulation scenarios are considered: the first one considers a variation in message traffic on the network; and the second one considers different implementations of drift in physical clocks. The analysis identified the behavior of protocols in the simulation environment, aiming to assist in choosing between them in future projects.