User's Manual

044-05251 Rev A A-1
Appendix A
Block Diagrams
Introduction
This appendix describes the main signals paths for the WRH.
Standard WRH
Figure A-1 illustrates a single band WRH block diagram. The TX signal from the BTS is converted to
an optical signal at a FON within a BMU or OCM and fed to the WRH via a fiber optic cable. The FON
in the WRH converts the fiber optic signal back to RF. It also supervises the signaling and reports
errors via the RCU connected to the CU. The RF signal enters the WBA at P1101. Amplification
occurs in the LNA and the additional amplifier stages followed by controllable attenuators. The signal
exits the WBA on P1401 and enters the PA at P4 where it is amplified and fed to the DPX.
If a BA is installed, the signal goes through it before being fed to the DPX, boosting the output DL
signal from the PA by typically 6dB. The amplified output signal passes the DPX before it is fed to the
service antenna.
The uplink signal path is located on the same WBA but has no PA or BA stage. An optional LNA can
be used.
Figure A-1 Standard WRH Block Diagram
WDM
FOU
DX
DX
DPX
DPX
WBA
WBA
DL
DL
UL
UL
LNA
LNA
PA
PA
To/From
OCM or
BMU
RCU
RCI
PSU
CU
FON
ALI
To
External
alarms
BA
BA
850 MHz
TX0/RX0
1900 MHz
TX0/RX0