Power Supply - Ericsson CME 20 R6.1 Reference Manual

30

Power Supply

The Power System rectifies the incoming power supply to DC voltage
for the users in the RBS. The internal DC power is converted centrally
with several internal DC voltage levels.
Distribution of system voltage is possible if the DC/DC conversion is
distributed.
Since the RBS is designed to apply to different national power systems,
there will be a number of connection possibilities to achieve suitable
mains power for the RBS.
Battery backup is internal.
30.1 References
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
30.2 Concepts
IT power system
TN power system
TT power system
Hold-up
RBS power system
User
EN/LZT 123 2697 R5A
1998-08-13
A power distribution system having no
direct connection to earth. The exposed
conductive parts of the electrical
installation are earthed.
A power distribution system having one
point directly earthed. The exposed
conductive parts of the installation are
connected to that point by protective earth
conductors.
A power distribution system having one
point directly earthed. The exposed
conductive parts of the installation are
connected to earth electrodes electrically
independent of the earth electrodes of the
power system.
The ability to hold the DC output voltage
within the allowed range on AC mains
interruption, without batteries
The function within the RBS that provides
the users with power. This comprises the
following equipment: rectifiers, batteries,
battery fuses, power distribution (cables
etc.) and the power control logic.
In this document, any unit that needs
power from the RBS power system in
order to function.
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Power Supply
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