Ericsson RBS 2106 Hardware Reference Manual page 59

RBS 2106 Radio Base Station
DF – Distribution Frame
The Distribution Frame (DF) is a connection and overvoltage protection (OVP)
device for external alarms and PCM links. The DF protects equipment inside
the RBS from overvoltage and overcurrent which may occur in external lines.
Examples of equipment requiring OVP include transmission lines, ESBs,
external alarms and positioning devices (GPS and LMU).
Number of units: 1
DXU-21 – Distribution Switch Unit
The DXU-21 is the central control unit for the RBS. It supports the interface to
the BSC, and it collects and transmits the 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-21 is provided with four connections for transmission lines. It can
handle 2 Mbit (E1) or 1.5 Mbit (T1) PCM links.
The DXU-21 has hardware support for EDGE on 12 TRXs.
Number of units: 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.
One version of the dTRU supports only GMSK and the other version supports
both GMSK and EDGE.
Number of units: 1 – 6
FCU – Fan Control Unit
The 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.
Number of units: 1
EN/LZT 720 0222 R3A 15 (30)