With the man's growing demand for communication services, communication networks, as the evolution of a few years ago forecast, with rapid communication to the computer (C & C) combined with the close of the mode of development. In the establishment soft to the exchange of technology-based core network technology of next-generation communications network (NGN), as well as third-generation mobile phone (3G) will have computer network technology as a platform. Today's communications networks, from technology development trend is already on the IT (information technology) and CT (ICT) of the growing integration. While the core of next-generation communications networks in order to ensure the security of electricity supply level of reliability, will continue to DC power supply on the basis of power mode, but in the business support system platform, the use of AC power supply model will co-exist. Based on computer equipment, a large number of applications, UPS systems in the communications network to use more and more. At present, the communication network, more and more widespread use of UPS power supply, the power supply has been targeted by a single computer equipment to the development of the terminal operations, network servers, network equipment, data storage equipment, business support platform and the whole communication network. The main targets of the scope of supply related to computer terminals, servers, routers, switches, monitors, disk storage arrays, such as the minicomputer. Supply is also a way.