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ETSI TS 102 121 gives guidance on installation, connection and operation of power supply systems for telecommunication / datacom installations and equipments. Also are considered items of equipment with their own power supply, which are connected to form a complete system installation.

The present document contains definitions for power supply and distribution systems in complement to power interfaces standards EN 300 132 series [5], [6], [7], [i.6] and [i.7].