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 Standard WRH Block Diagram
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 occurres 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.
FOU
FON
P102RX
TX
P101
P130
P31
P33
WBA
PA - DL
LNA
DPX
ALI / RCI
WLI
P34/
P36
P130
ANT
HI
LO
P1101 P1401
P4 P5
RCU
PSU
RCI
BMU
OCM
FLI
P4P3
BA
LNA
P2401 P2101
CU
DL
UL
LNA - UL
OUT1 IN