The present document contains requirements for:
the output performance of the power equipment at the interface A3;
the input of the telecommunications equipment connected to interface A3.
The voltage at interface A3 may be the ac mains, a rectified voltage derived from ac three phase mains, a rectified voltage
derived from ac single phase mains or a low voltage derived from a battery. The power supply equipment may incorporate
a backup battery.
The present document aims at providing compatibility between the power supply equipment and both the
telecommunications equipment, and the different load units connected to the same interface A3 (e.g. datacom equipment).
The requirements at interface A3 apply to:
the output of the power supply equipment or power supply installation of telecommunications centres;
the power supply input of telecommunications equipment and the datacom equipment installed at
telecommunications centres;
telecommunications equipment and the datacom equipment, installed in customers premises, whose power
interface A3 is also used by equipment requiring a supply to the present document.
The purpose of the present document is:
to identify a power supply system with the same characteristics for all telecommunications and data
communication equipment defined in the area of application;
to facilitate interworking of different (types of) loads units;
to facilitate the standardization of power supply systems for telecommunications and datacom equipment;
to facilitate the installation, operation and maintenance in the same network of equipment and
telecommunications and datacom systems from different origins.