Basic Configurations; Dtru Topology - Ericsson RBS 2207 Product Description

RBS 2106 and RBS 2206
GSM 1800
GSM 1900
These frequency bands are supported by the configurations described in this
document.
5

Basic Configurations

The GSM 800, GSM 900, GSM 1800 and GSM 1900 configurations meet the
GSM requirements, except where otherwise stated.
The capacity of a configuration is defined at the TX and RX antenna reference
points at the RBS border. There is an X close to every reference point in the
following figures. The RBS border is not included in the figures.
The equivalent output power with SW power boost (TX diversity) configured
is the original output power specified for the basic configuration increased by
typically 3 dB, if separate TX antennas are used. The configurations that
support SW power boost are listed in Section 6.3 on page 49.
Functional views of radio signal paths for various configurations are shown in
Figure 4 on page 8 up to and including Figure 21 on page 40. Only components
necessary to illustrate the configuration are shown.
In some configurations, the radio signal paths can differ depending on where in
the cabinet the basic configuration is used. The figures show fully-equipped
cabinets with two or three BTSs, that is two or three basic configurations are
shown in the same figure. These are different physical implementations of the
same basic configuration, not different configurations. The second BTS is drawn
with dotted lines to show how an SCC in a fully-equipped cabinet is connected.
5.1

dTRU Topology

Configuration of Hybrid Combiner
The dTRU can be configured with or without the hybrid combiner, using two
external cables.
Later versions of the dTRU do not use external hybrid cables, see Figure 5 on
page 9.
EN/LZT 720 0318 Uen R5A
Uplink: 1710 – 1785 MHz
Downlink: 1805 – 1880 MHz
Uplink: 1850 – 1910 MHz
Downlink: 1930 – 1990 MHz
Radio Configurations
7 (62)