Reference Manual

Product Data RBS 2106

ACCU AC Connection Unit

ADM Auxiliary Distribution Module

ASU Antenna Sharing Unit

BFU Battery Fuse Unit

CDU Combining and Distribution Unit

CXU Conﬁguration Switch Unit

DF Distribution Frame

DXU

Distribution Switch Unit

dTRU Double Transceiver Unit

FCU Fan Control Unit

IDM Internal Distribution Module

OXU Optional Expansion Unit

PSU Power Supply Unit

TM Transport Module

TMA-CM Tower-Mounted Ampliﬁer Control Module

5.2.1 Cabinet Hardware: Basic Units

The functions of speciﬁc units of the RBS 2106 are described brieﬂy

here.

Distribution Switch Unit (DXU)

The DXU is the central control unit for the RBS. It supports the

interface to the 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 which makes it possible to replace a faulty

DXU without the need for loading RBS software from the BSC.

The DXU is provided with four connections for transmission lines. It

can handle 2 Mbit (E1) or 1.5 Mbit (T1) PCM links.

The DXU has hardware support for EDGE on 12 TRXs.

Combining and Distribution Unit (CDU)

The CDU is the interface between the transceivers and the antenna

system. All signals are ﬁltered before transmission and after reception

by means of bandpass ﬁlters. The CDU allows several dTRUs to share

antennas. There are a maximum of three CDUs in one RBS 2106.

The task of the CDU is to combine transmitted signals from several

transceivers, and to distribute received signal to several transceivers.

The CDU is hardware-prepared to support EDGE.

Two different CDU types are used in RBS 2106 to support all the

conﬁgurations.

CDU-F is a ﬁlter combiner intended for high capacity solutions. It can

handle up to four transceivers on two antennas. One-, two- and three-

sector conﬁgurations are possible in one cabinet with only two antennas

88 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary