Passive element fault analysis at the last mile of the FTTH network in Malaysia

The optical transceiver performance for GPON FTTH (OLTTx and ONURx) for 300 live subscribers at legacy area has been monitored hourly for a duration of four months. The optical performance is then plotted against its faults due to the passive element at the last mile of the GPON FTTH network. The results show that the fault rate for aerial type of fiber distribution (FDP) is higher (1.3%) than building, street cabinet and underground FDP types. More than 65% of the faults are contributed by optical fibers (drop fibers) and the rest is due to fiber connectors. The optical power received (ONURx) spectrum shows three types of patterns before disconnection; sudden disconnection, fluctuation and degradation of ONURx. This study provides preliminary information necessary for developing the passive element fault prediction for GPON FTTH at the last mile of the network

Electrical characteristics of photovoltaic cell module by simulation

This paper emphasizes on the model verification of the electrical performance of a Photovoltaic (PV) cell module by MATLAB/Simulink simulation. The developed model can then be us ed to predict the PV cell behavior under different physical and environmental parameters such as solar irradiation, ambient temperature, series resistor, shunt resistor, diode saturation current and cell arrangement. Photovoltaic cell model is used for com par i ng the electrical characteristics for this modeling process. Kyocera PV module is used as the module specification, whereby a PV model can be easily generalized to predict the output current, power characteristics and the maximum power point tracking