Comba Telecom Ltd. RX4122-B 用户手册
INSTALLATION GUIDE FOR RX-4122
ENU STATUS : 1-0-1
Copyright - refer to title page
Page 10
2 EQUIPMENT DESCRIPTION
2.1
FUNCTIONAL BLOCK DIAGRAM
Mobile
Ant
Donor
Ant
Mobile
Power
Supply
Alarm
Indicator
Main Control Unit
OMT
LAN
DT
MT
BTS
DL Subband 01
BIAS
Tee
DL Subband 02
PA
PA
DL_01
DL_02
UL_01
UL_02
DL_01
DL_02
UL Subband 01
UL Subband 02
UL_01
UL_02
Digital
Integrated
module
LNA
DL_01
DL_02
LNA
UL_01
UL_02
DL_01
DL_02
UL_01
UL_02
Figure 2: PS BDA Functional Block Diagram
In the downlink path, the BTS signals are received by the donor antenna of the repeater. After the circulator, the
signals are sent to downlink filter and then the LNA module for pre-amplification and to the digital RF integrated
module for digital filtering and frequency conversion. Then the DL signals will be sent to the downlink PA to
amplify power, and filter via downlink filter, the circulator, and last, the signals are transmitted at the MT port to
the service antenna.
In the uplink path, the mobile signals are received by the service antenna. After the circulator, the signals are
sent to uplink filter, and then to LNA, digital integrated module for digital filtering, then to the PA for power
amplification and to the uplink filter, the circulator, after that, the uplink signals are sent to the donor antenna for
transmission back to the BTS.