Radiated Emissions Anomaly Caused by High Voltage Disturbance of an Optical Network Terminal (ONT) Installation

Abstract

Faster wireless telecommunication systems are going to be the future of Telecommunication Industry. EMC issues and natural challenges arise with its growing entry in modern customer premises equipment (CPE). Optical Network Terminal is used by PT TELKOM to deliver fixed broadband services to customer, some case Telkom’s CPE network get disturbance by lightning strikes. Faster delivered data from a device need more transmit power, this contribution provides an overview of the occurring and electromagnetic interference dominating disturbance voltage of an Optical Network Terminal (ONT) in telecommunication system. EMC measurements and EMC Engineering measurement method is introduced and applied in this study with 30 MHz – 1 GHz range frequency. The presented method covers recurring radiated emission measurements according to CISPR 22 standard. 4 kV disturbance on power supply cable by surge generator in combination with ONT installation and GTEM Cell obtaining estimation of the radiated emissions occurring during the test. The result of radiated emission test is compared between ONT with voltage disturbance attached and without it. Examination of high voltage disturbance contribution to the radiated emission measurement is presented using CISPR 22 statistic graph and emission pattern inside the test cell of GTEM.