Andrew Wireless Innovations Group BCEL-FAST719 User Manual

Page 11  of 28

 

The local unit has different monitor signals, leading to different alarms: 
 

UL AGC out of range 

RU1, 2, 3, or 4 

Flashing 

MINOR 

Red 

UL optical power too low 

RU1, 2, 3, or 4 

Fixed 

MAJOR 

Red 

DL laser optical power too low  

LU 

Fixed 

MAJOR 

Red 

UL RF amplifier  

LU 

Fixed 

MAJOR 

Red 

DL RF amplifier  

LU 

Fixed 

MAJOR 

Red 

Temperature alarm 

LU 

Flashing 

MINOR 

Red 

Supply alarm 

LU 

Fixed 

MAJOR 

Green 

 
The Link LEDs (RU1, 2, 3, and 4) report information from the remote units, according to the 
following table: 
 

SEVERITY 

DL AGC out of range 

RU1, 2, 3, or 4 

Flashing 

MINOR 

DL optical power too low 

RU1, 2, 3, or 4 

Fixed 

MAJOR 

DL RF amplifier 1  

RU1, 2, 3, or 4 

Fixed 

MAJOR 

DL RF amplifier 2  

RU1, 2, 3, or 4 

Fixed 

MAJOR 

Antenna disconnected (DC loop) 

RU1, 2, 3, or 4 

Flashing 

MINOR 

External 1 

RU1, 2, 3, or 4 

Fixed 

MAJOR 

External 2 

RU1, 2, 3, or 4 

Fixed 

MAJOR 

The TFLF provides dry contacts to report alarm condition to third party equipment auxiliary 
inputs (i.e. BTS or repeater).  The dry contacts status is reported in the following table: 
 

NONE 

OPEN 

MINOR 

OPEN 

MAJOR 

CLOSED 

 
If the alarm condition is “none” (contact open) the relays driving the contacts are normally 
excited. In case of power supply failure the system is not powered and the dry contacts will be 
automatically driven to a “closed condition”, corresponding to a “major” alarm. 

The TFLF is designed to be compatible with most pico/micro BTS’s. The allowed levels can 
span from 10mW to 5W. Power levels greater than 100mW require an external attenuator. This 
external attenuator will affect both the uplink and downlink paths, adding unwanted attenuation 
to the uplink path.  
 
In this case, the variable uplink attenuator must be adjusted (the range is 20dB with 5dB steps), 
as per table in the appendix E. 
 
To adjust the value use a flat screwdriver 
 
 
 
 
 
 
 
 

 
 

Figure 6  Uplink Attenuator Adjustment 

A simple procedure is required to set the final system configuration. This is necessary in case of 
a partially populated system, where optical alarms can arise if some optical ports are not 
connected to remote units.  The procedure to be followed is reported below: