8 0 0 M H Z B I D I R E C T I O N A L A M P L I F I E R T E C H N I C A L M A N U A L
5
Sub B’d Card
LED Alarms
MGC
HPA
DPLX
Power Supply (PSU)
DPLX
Donor
Antenna
(Base)
DAS Service
Antenna
(Mobile)
10,20,
..
1,2,3,..
Det
1,2,3,..
10,20,..
Monitoring & Control Unit
MGC ATT
MGC ATT
MGC ATT
MGC ATT
HPA
LNA
LNA
AGC ATT
AGC ATT
AC
DC
Down Link Path
UP Link Path
RS 232
USB (Optional)
Clk,Data,En
Det
Clk,Data,En
Det
Figure 1: Block diagram of the 800 MHz bidirectional amplifier
Led indicator Alarm and Manual level control.
-
The unit has a visual Alarm as led indicators for the following main functionality; AGC, S/D and Power.
o
AGC alarm tuned red when the AGC is not delivering any attenuation. This can happen in two
situations either the AGC is tuned off by the user (see monitoring and control section) or if the
signal at input of the DL is too week. This is not necessarily a failure. It can be just a warning
that the signal from the BTS is too week.
o
S/D The shutdown indicator turn red when the system is automatically shut down. This happen
when the internal temp is too high or when output power exceed the max limit allowed. When
the RF module is turned off by the user (see monitoring and control section) the S/D indicator
start flashin
※
.
o
Power indicator turns red when the RFM is not receiving the DC power.
