Andrew Wireless Innovations Group RPT-MMR8L User Manual

 

User’s Manual for Remote Unit 

MMR8L L

 

Page 30 

 

M0106ASB.doc 

 

 
For local supervision, a LED on the connector flange of the remote unit gives an 
indication of possible reasons for alarms. This table shows possible on-site measures 
that could be checked before referring to the master unit alarm list. 
 
LED Indication 

Green 

No alarm 

Æ

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 28V 

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

Temperature 

Reduce environmental temperature.  
Eliminate thermal short circuit. 

Fan 

Disconnect and connect mains. Fans should 
run briefly (SW version > 2.4). If not, replace 
the fans at RU. 

I²C 

Disconnect and connect mains. 

Optical alarm Tx  - 

Red 

Amplifier “Power 
Down” 

(MU: Change amplifier setting at MU 
controller). 

LED off 

Mains 

Check power switch inside of RU (RUs with 
door). 
Check mains cabling. 
Check mains power. 

 

For the position of the LED see chapter 6.4 LED Alarms. 
 
Explicit troubleshooting is available in the MU software, (software manual or WEB 
Interface).