Andrew Wireless Innovations Group BCEL-FAST900 User Manual

Page 19  of 28

 

Figure 16  Optical Fiber Connection Examples 

An electrical test point is available on the remote unit to check the downlink optical power.  
Connect the fibre coming from the local unit, power both units and measure with a multimeter 
the voltage between ground and the test point.  A satisfactory DL optical power will give 
measurement greater than 300mV, corresponding to an optical power level of around –5dBm. 
 
 

 

Figure 17  Remote Unit TFAF Electrical Test Point 

 
 

 
 
 

DL AGC out of range  

RED 

Flashing 

MINOR 

Optical power below –4dBm: 
check for fiber or splices 
stresses, clean optical 
connectors 

DL optical power too low  

RED 

Fixed 

MAJOR 

Optical power below –6dBm: 
check for fiber or splices 
stresses, clean optical 
connectors 

DL RF amplifier 1  

RED 

Fixed 

MAJOR 

Internal failure: replace TFAF 

DL RF amplifier 2  

RED 

Fixed 

MAJOR 

Internal failure: replace TFAF 

Antenna disconnected (DC 
loop) 

RED 

Flashing 

MINOR 

Antenna cable probably 
broken or disconnected. 

Antenna connected to TFAF 
doesn’t support DC-loopà see 
store procedure to mask 
unwanted alarm 

External 1 

RED 

Fixed 

MAJOR 

External alarm 1 

External 2 

RED 

Fixed 

MAJOR 

External alarm 2 

      

 

              WRONG                                               OPTIMAL