Andrew Wireless Innovations Group BCEL-FAST719 用户手册

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0 dB 

AGC working, constant RF gain  

none 

NONE 

< 3dB 

AGC working, constant RF gain 

none 

NONE 

< 5 dB 

AGC not working, RF gain 
decreases according to 2dB 
electrical per 1dB optical  

AGC out of range: 
red LED flashes  

MINOR 

> 5 dB 

AGC not working, the optical 
signal is too low, the receiver is 
automatically switched off in 
order to reduce the unwanted 
noise to the system. 

Optical power too 
low: red LED 
fixed, relays 
alarmed. 

MAJOR 

 
 

The TFAF is fully managed and supervised by the local microprocessor. The alarms are fully 
managed by software according to different severity levels, and reported as local visual alarms 
(LED’s) and on the data link to the local unit. 
 
There are 2 LED on the Local unit, one red alarm LED is related to optical link and internal 
failures, one green LED is for the power supply. 
 
 
 
 
 
 
 
 
 

Figure 12  Remote Unit TFAF LED’s 

 
 

UL AGC out of range 

RED 

Flashing 

MINOR 

UL optical power too low 

RED 

Fixed 

MAJOR 

DL RF amplifier 1  

RED 

Fixed 

MAJOR 

DL RF amplifier 2 

RED 

Fixed 

MAJOR 

Antenna disconnected (DC loop) 

RED 

Flashing 

MINOR 

External 1 

RED 

Fixed 

MAJOR 

External 2 

RED 

Fixed 

MAJOR 

Two external alarm contacts are provided. These contacts are open under non-alarm condition. 
 
 
 
 
 
 
 

 
 

Figure 13  Remote Unit TFAF Alarm Connectors