User Manual

Table Of Contents
Ericsson Internal
DESCRIPTION 29 ( 50 )
/ XSNSIXI 129/1551-LZA 701 0001 Uen
CBC/ XRX/M ( Kai Lian) 2011-05-05 F
Prepared (also subject responsible if other) No.
Approved Checked Date Rev Reference
The CXU is configured using software.
Number of units: 1 2
DF
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 can occur in external lines.
Examples of equipment requiring OVP include transmission lines, ESBs and
external alarms.
Number of units: 1
DXU
The Distribution Switch Unit (DXU) is the central control unit for the RBS. It
supports the interface to the Base Station Controller (BSC), and it collects and
transmits the alarms. The DXU controls the power and climate equipment for
the RBS. It has a removable compact flashcard that enables replacement of a
faulty DXU without the need to load RBS software from the BSC.
The DXU is provided with four connections for transmission interfaces. It can
handle both 2,048 kbps (E1) and 1,544 kbps (T1) transmission interfaces. The
DXU has hardware support for EDGE on 12 TRXs.
DXU-21 is used in RBS 2106 and RBS 2106i. DXU-23 is used in RBS 2106 V3.
Number of units: 1
dTRU
The double Transceiver Unit (dTRU) contains two TRXs used to transmit and
receive two radio carriers.
It has a built-in combiner with the option to combine 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
GMSK, 8-PSK, 16-QAM and 32-QAM.
The dTRU EDGE supports GMSK, 8-PSK, 16-QAM and 32-QAM, as well as
Voice services over Adaptive Multi-user channels on One Slot (VAMOS). Some
versions of dTRU EDGE have limitations on VAMOS. For details, please refer
to document BTS Parameter Limitations.
Number of units: 1 6