Reference Manual

Radio Conﬁgurations, RBS 2106 and RBS 2206

Downlink: 1805 – 1880 MHz

GSM 1900 Uplink: 1850 – 1910 MHz

Downlink: 1930 – 1990 MHz

These frequency bands are supported by the conﬁgurations described in

this chapter.

4.5 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 with typically 3 dB, if separate TX antennas are

used. The conﬁgurations that support SW power boost are listed in

Section 4.6.3 on page 77.

Functional views of radio signal paths for various conﬁgurations are

shown in Figure 6 on page 38 upto and including Figure 24 on page 66.

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.

4.5.1 dTRU Topology

Conﬁguration of Hybrid Combiner

The dTRU can be conﬁgured with or without the hybrid combiner,

using two external cables.

RX Signals Distributed from Two Ports

The RX signals can be distributed from the RX1 and RX2 ports to all

four receivers when both transceivers are connected to the same antenna

system.

EN/LZT 720 0008 P2A

2001-11-28

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Preliminary