Ericsson RBS 2106 Reference Manual page 92

Product Data RBS 2106
Internal Distribution Module (IDM)
The IDM is a panel for distributing the internal +24 V DC power to the
various units. Each distribution circuit in the cabinet is connected to a
circuit breaker in the IDM.
Auxiliary Distribution Module (ADM)
The ADM handles distribution and fusing of system voltage (+24 V DC
and -48 V DC) to the transport module (TM).
It should be noted that the ADM is optional equipment in the RBS 2106.
Battery Back-up
Batteries can be installed inside the cabinet in either of the TM/BM
spaces located to the left of the BFU. It is also possible to use an
external source of battery supply via the DC filter; if this is done,
internal batteries may not be used. For more information on the battery
back-up system, see Section 5.4.2 on page 104.
It should be noted that battery back-up is an optional equipment in the
RBS 2106.
Battery Fuse Unit (BFU-21)
The Battery Fuse Unit (BFU) supervises connection or disconnection of
the batteries. It can also be used to provide prioritized power supply,
for example to the transmission equipment.
Each RBS cabinet will require its own BFU, regardless of battery
back-up configuration.
DC/DC Converter
The DC/DC converter can supply -48 V DC power to transmission
equipment in the TM compartment. It converts +24 V DC to -48 V DC.
Two DC/DC converters can be installed if needed.
It should be noted that the DC/DC converter is optional equipment in
the RBS 2106.
Fan Control Unit (FCU)
The Fan Control Unit (FCU) is concerned with cooling RUs, not with
controlling the general temperature or humidity conditions within the
cabinet.
The FCU monitors the temperature sensors located on certain RUs and
controls the speed of the four internal cabinet fans accordingly. The
fans are positioned between the CDU subrack and the roof, giving a
common suction area.
Climate Unit
The climate unit maintains the internal temperature and humidity inside
the cabinet. The climate unit is mounted in the door of the cabinet.
Two types of climate units are available:
90 (485)
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2001-11-28