Modern digital exchanges in old telecom power environment

When new digital telephone exchanges are installed in old telecommunications buildings, many different problems arise regarding the DC power supply of the new exchanges. The authors describe technical and economic considerations necessary to achieve optimal solutions. Based on a comparison between the use of adaptation systems and a modern power supply system, it is concluded that there are considerable benefits from the use of modern power supply systems together with modern electronic telephone exchanges, and that this solution should therefore be thoroughly considered. In general, the choice is made to replace old electromechanical telephone exchanges, it is advisable to replace the old power supply system as well. In connection with this, it is also important to consider overall operational economy, such as spare parts routines, maintenance, recruiting personnel, and energy costs