Since the urgent demands for high-speed broadband Internet, facilities originally installed in a unit-central office end are moved to the places close to the users in order to enhance the broadband and overcome the high-frequency attenuation of copper cables, such as cross connecting cabinets (CCC) on streets, and the lines between a unit-central office and CCC are changed to optical fiber cables. Network transmission technology has currently become the generation of optical fiber. To actually promote fiber to the home, the value-added services of high-speed Internet access, VoIP, and multimedia service for users are currently the highlighted telecommunications technology and businesses. Nevertheless, copper cables have been used for a long period of time that it would be costly to completely replace copper cables. Gradually replacing old cables with new ones is considered as the optimal strategy. Without constructing optical fiber lines at different places or completely removing copper cables, Automatic Handshaking Signal Module (AHSM) for a CCC developed in this study is considered economical and simple. It could monitor the signal handshaking through remote control and make structural and functional changes of existing copper-cable cross connecting cabinets for the low-cost and high-efficiency seamless technology transfer.

To design and implement a stand-alone photovoltaic power generator monitoring system with remote control functions. The hardware architecture consists of solar cells, solar charger, DC/AC inverter, energy storage device, energy consumption equipment, electrical load, PLC controller, I/O card, router, and supervisory control computer, while the software is composed of programmable software and graphic supervisory control software. With the self-developed solar charger, the conversion efficiency of this system achieves 93.26%. Besides, with maximum power point tracking function, the solar cells could continuously output maximum power. The user-friendly human-machine interface would transmit the information acquired by PLC controller, through MODBUS TCP communications protocol, to the remote computer; this would supervise and control the voltage, electric current, power, fault detection, network monitoring, and run chart function in the photovoltaic energy generating system; and the supervised and controlled data would be recorded in detail and stored into the database for further study and analyses. The experiment confirms the convenient operation of this system that it could effectively supervise and control the conditions of the system.