Product Data RBS 2106
the back-up batteries, the BFU also provides prioritized power supply
that can be used for example for transmission equipment.
It should be noted that battery back-up is optional in the RBS 2106.
5.5
Antenna System
This chapter contains information about antenna configurations for
outdoor cells.
There are a number of antenna system products available, such as
antennas, feeders, jumpers, TMAs and so on. For more detailed
information about products, see
RBS Site Solutions homepage:
http://gsmrbs.ericsson.se/gsmsystems/solutions/rbs_site_solutions/
index.htm
5.5.1
ddTMA
The Dual Duplex Tower-Mounted Amplifier (ddTMA) improves the
receiver sensitivity and duplexes RX and TX signals to the same cable
(thus saving feeder cables). It is mounted on the antenna support, close
to the antenna.
The ddTMA is provided with 15 V DC power by the TMA control
module (TMA-CM) located in the RBS 2106 cabinet. The TMA-CM
also identifies amplifier faults, and sends this information to the alarm
module in the RBS.
The ddTMA is further described in:
Radio Site Product Data
Manual
EN/LZT 720 0026
5.5.2
Radio Configurations
The various configurations available for cabinets are described as the
number of cells, times the number of TRXs per cell. For example, a
3x2 cabinet is configured for three cells, each using two TRXs.
The high-capacity combiner CDU-F supports the following GSM 900/
1800 configurations:
•
3x2 (and its derivatives: 1x2 and 2x2)
•
3x4 (and its derivatives: 1x4 and 2x4)
•
1x8
•
1x12
•
2x6
•
1x4+1x8
•
1x8+1x4
The combiner CDU-G can be used for either high capacity or high
coverage. It supports the following GSM 800/900/1800/1900
configurations:
EN/LZT 720 0008
P2A
2001-11-28
105 (485)
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Summary of Contents for RBS 2106
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