CMS uniform low voltage power supply system

Some problems of the CMS front-end-electronics low voltage power supply are discussed in. The most serious of them was the very significant power losses in the connecting low voltage cables. There was shown that these losses could be minimize by using a three stage power supply system, in which an intermediary stage, mounted on the CMS detector periphery, is included. During the last two years this idea is developed and modified. New equipments for the first end second stage are proposed, evaluated and tested. On this base an uniform low voltage system for all CMS subdetectors is accepted now and will be described below. (11 refs).