Andrew Wireless Innovations Group M17P26 User Manual

 

Page 24 

Manual MF0133AUA.doc

 

 
The Built-In Test (BITe) concept comprises the monitoring of the power supplies, the 
power amplifiers and the optical interface. 
 
All alarms occurring can be checked via software at the Master Unit. 
 

 
In alarm condition, an alarm message is sent to the Master Controller. 
 
If the reason for the alarm is cleared, the alarm will disappear. Otherwise, i.e. if the 
alarm continues, a new alarm message will not be repeated. 
 
A new alarm message will be generated if the alarm is interrupted for at least five 
seconds after alarm clearance by the RU. 
 

 
Refer to the corresponding software documentation of the Master Unit for details. 
 
For local supervision, a status LED on the connector flange of the remote unit gives 
an indication of possible reasons for alarms. The position of the status LED is 
illustrated in chapter 3.2.2 Connections. This table shows possible on-site measures 
that could be checked before referring to the master unit alarm list. 
 
Status LED indication  Alarms 

Green 

No alarm 

 

Status ok 

 

Door alarm 

Close the door (RUs with door). 

Alarms not directly related to RU:  

External alarms 

Check externally connected devices. 

Optical alarm Rx 

Check fibre loss of optical link. 
Check optical connectors. 
Clean optical connectors. 
(MU: Check optical output power of 
corresponding OTRx at master unit). 

Orange 

ALC alarm 

Power 28 V 

Change power supply (RUs with door). 
Replace the affected remote unit. 

Red 

Temperature 

Reduce environmental temperature.  
Eliminate thermal short circuit.