User Manual

Ericsson Internal
DESCRIPTION 14 ( 24 )
/ XSNJOER 174/1551-LZA 701 0001 Uen
EAB/ FJG/YP ( Louise Cederlund) 2007-06-12 A
Prepared (also subject responsible if other) No.
Approved Checked Date Rev Reference
CDU uses the hybrid combiner in the dTRU. To achieve coverage, the CDU is
used in a configuration when the hybrid combiner in the dTRU is not used.
Number of units: 1–3
DCCU - DC Connection Unit
The DCCU distributes the incoming DC power supply voltages to the PSUs.
The unit also contains DC filter equipment.
Number of units: 0–1
dTRU - double Transceiver Unit
The dTRU contains two TRXs for transmission and reception of two radio
carriers. It has a built-in combiner with the optional possibility of combining two
TX signals into one TX output. It is also prepared for four-branch RX diversity,
for further improvements in sensitivity.
Number of units: 1–3
DXU-21 - Distribution Switch Unit
The DXU is the central control unit for the RBS. It supports the interface to the
BSC, and it collects and transmits alarms. The DXU controls the power and
climate equipment for the RBS. It has a removable compact flashcard, which
makes it possible to replace a faulty DXU without the need for loading RBS
software from the BSC. It can handle both 2 Mbit (E1) and 1.5 Mbit (T1) PCM
links.
Number of units: 1
FCU - Fan Control Unit
The FCU controls the four fans in the cooling system by regulating fan speed.
The FCU is controlled by the DXU.
Number of units: 1
IDM-02 - Internal Distribution Module
The IDM contains circuit breakers for distribution of the internal +24 V DC
power to the various units.
Number of units: 1
PSU - Power Supply Units
The PSUs are available in two versions, PSU AC for connection to AC mains,
or PSU DC for connection to
48 to 60 V DC power supply. The PSU AC
converts 120–250 V to regulated +24 V DC. The PSU DC converts
48 to
60 V DC to regulated +24 V DC.
Number of units: 0–2