Reference Manual Part 1

RBS 2206
• CDU-G can be configured either for high capacity or for high coverage. It is
a combiner that can be used for synthesizer hopping.
Number of units: 1 – 3
CXU
The Configuration Switch Unit (CXU) cross-connects 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.
Number of units: 0 – 1
DCCU -
The DC Connection Unit (DCCU) connects, disconnects, and distributes the
incoming DC power supply to the PSUs and the climate unit. It consists of two
parts: a Connection Unit and a Distribution Unit.
Number of units: 0 – 1.
dTRU
The double TRansceiver Unit (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. Variants of
the dTRU supports both GMSK and EDGE.
Number of units: 1 – 6
DXU-21
The Distribution Switch Unit (DXU-21) is the central control unit for the RBS.
It supports the interface to the BSC, and it collects and transmits alarms.
The DXU-21 controls the power and climate equipment for the RBS. It has
a removable compact flashcard which makes it possible to replace a faulty
DXU-21 without the need for loading RBS software from the BSC. The DXU
is also provided with four ports for transmission interfaces. It can handle both
2048 kbit (E1) and 1544 kbit (T1) transmission interfaces. The DXU-21 has
hardware support for EDGE on 12 TRXs.
Number of units: 1
16 (28)
E
N/LZT 720 0225 Uen R6A