A Rack Mounted Complete DC Power System

Development of DC power systems in British Telecom aims to produce power plant which is aligned with equipment needs and practice. The modern needs are for greater flexibility and for the power equipment to be compatible in all respects with an equipment environment. These aims are now possible with the use of switch mode power supply and sealed secondary cells for power storage. Full advantage is being taken of the technological developments in both these areas, to produce a power equipment rack for installation en-suite with telecommunications equipment. This rack will provide all the necessary conversion and power storage from the public mains input (240V ac) to the secure dc supply voltage. This paper discusses the changing needs for power and the development of a power package for use with our new telecommunications system. The concept has been developed with reliability, flexibility, installation and maintenance in mind. There are significant advantages in terms of capital provision, saving on DC distribution, reduced lead times and accommodation.