-48 V DC computer equipment topology-an emerging technology

This paper describes the escalating Internet development, which is characterised by the integration of telecommunications and data communications. An obvious example is Internet telephony through packet switching. Carrying voice traffic means intensified demands on power supplies of the Internet equipment, to meet public demand for an ever-functioning service. With data traffic, a small number of power outages and service interruptions are tolerated, in accordance with the more limited requirements on power supplies for data communications. When it comes to voice, demands on power supplies are more stringent. With the snowballing expansion of the Internet and, at the same time, the growing needs of society for well-functioning telecommunications, power supplies play a key role. We should take this opportunity to invest in the right power supply at the right time, to use the advantages offered by the Internet, to avoid the disadvantages of the power supplies of today´s Internet equipment, and to benefit from what telecommunications power supplies have to offer. A comparison is given of a -48 V DC system and a UPS system. Availability performance and reliability analysis are also discussed