Reference Manual

Product Data RBS 2206
Configuration Switch Unit (CXU)
The task of the CXU is to cross-connect the CDU and the dTRU in the
receiver path. The CXU makes it possible to expand or reconfigure a
cabinet without moving or replacing any RX cables.
The RX inputs/outputs on the dTRU and the CDU are placed in such
positions that they minimize the amount of cable types for connecting
the CXU with the dTRUs and the CDUs.
The CXU is configured by means of software.
Power Supply Unit (PSU)
The RBS 2206 contains up to four Power Supply Units (PSU). The
PSUs are available in two versions, PSU AC for connection to AC
mains, or PSU DC for connection to -48 or -60 V DC power supply.
The PSU AC converts 120-250 V to regulated +24 V DC. The PSU DC
converts -(48 - 60) V DC to regulated +24 V DC.
Cooling System
The cooling system uses forced air. The air inlet is the perforated door
and the outlet is on the roof.
The cooling system consists of four fans and a Fan Control Unit (FCU)
that controls the fan speed. The FCU is controlled by the DXU. When
the cabinet is not fully equiped, RU dummies are needed to ensure that
the cooling system works properly.
The fans are positioned between the CDU subrack and the roof, giving
a common suction area. They draw the air through three separate
channels around the RUs.
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.
AC Connection Unit/DC Connection Unit (ACCU/DCCU)
The ACCU/DCCU handles distribution and connection/disconnection of
the incoming power supply voltages to the PSUs. The connection/dis-
connections are performed by the main switch. The units also contain
filter equipment.
DC Filter Unit
The DC filter unit is the interface for +24 V DC power supply or
battery back-up.
Space for Optional Expansion (OXU)
There are four positions available for optional RUs in the DXU/PSU
subrack, for example for TMA-CM and DXX. One 19-inch OXU-
position is also available between the CXU and the dTRU subrack.
116 (485)
EN/LZT 720 0008 P2A
2001-11-28
© Ericsson Radio Systems AB
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