Siemens BS-240 Technical Description page 51

Information
Base Station System
A30808-X3247-L14-2-7618
High Power Duplexer (HPDU2)
The High Power Duplexer has the task of combining the TX and the RX paths into one
antenna, in order to minimize the number of antennas when FICOM is used. The HPDU
contains a duplex filter for the transmit frequency band and for the receive frequency
band, but no Low Noise Amplifier in the RX path. If the TMA is used together with a
HPDU, the BIAS-T (DUBIAS) for powering and signalling of the TMA is required. Up to
two HPDU can be integrated on top of the Rack below the cover and also up to two
HPDU can be fit in the gap between the inner side wall and the Frame in the shelter. For
the main RX path, one HPDU per cell is installed. For diversity operation, a second
receive path has to be installed. In one Base or Extension Rack/Shelter, one or two
HPDUs can be installed and a maximum of 8 carriers can be connected to one HPDU.
Fig. 4.7 shows the standard configuration for one cell using HPDU, FICOM and
DIAMCO for up to 8 carriers in one Rack.
The HPDUs are implemented for three different frequency bands: P-GSM 900, GSM
1800 and GSM-PS 900 (P-GSM shifted to E-GSM).
TX-Filter
FICOM
0 1 2
TX
Fig. 4.7 HPDU
BIAS-T (DUBIAS)
If the TMA is to be used together with a HPDU, a BIAS-T (DUBIAS) for powering and
signalling of the TMA is required.
The DUBIASs are implemented for two different frequency bands: R-GSM 900 and
GSM 1800 .
TX-Filter RX-Filter
HPDU
7
Technical Description (TED:BSS)
RX-Filter RX-Filter
DIAMCO
0 1 2 7 0 1 2
RX
RX
BS-240/241
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