Reference Manual

Table Of Contents
Description 27 (37)
LRN/X-99:083 Rev F 2001-07-17 © Ericsson. Commercial in confidence
6.2 CDU-types for GSM 1800
CDU-G 1800
dTRU
CDU-G
CDU-
G
dTRU
TXCout TX1
RXDA
DPX
DPX
RXDA
RXout1
RXin1
RXin2
RXin2
RXin1
TXCout TX2
RXout2
TX/RX
TX/RX
dTRU
CDU-G
dTRU
TX2
RXDA
DPX
DPX
RXDA
RXin2
RXin1
TXCout TX1
TXCout
TX/RX
TX/RX
dTRU
CDU-G
dTRU
TXCout TX1
RXDA
DPX
DPX
RXDA
RXout1
RXin1
RXin2
RXin2
RXin1
TXCout TX2
RXout2
TX/RX
TX/RX
CXU
RXin2
RXin1
RXout1
RXout2
Figure 11. CDU-G for GSM 1800 in a configuration with four TRXs (two dTRUs) in each sector.
Hybrids in the dTRUs are used.
With CDU-G it is optional to use the hybrid combiner in the dTRU.
If the hybrid combiner is used 4 TRXs per cross-polarised antenna is supported. When the
hybrid combiner is by-passed the output power is maximised.
Synthesised or base band frequency hopping is allowed for all CDU-G configurations.
Sector 1
Sector 2
Sector 3