7 
 
The connection between the 
MA5672 and the OLT is not set 
up. 
Blinks quickly 
(twice per second) 
The MA5672 is attempting to set 
up a connection to the OLT. 
The connection between the 
MA5672 and the OLT is set up. 
The Rx optical power of the 
MA5672 is normal. 
Blinks slowly 
(once two 
seconds) 
The Rx optical power of the 
MA5672 is lower than the optical 
receiver sensitivity. 
Blinks quickly 
(twice per second) 
Blinks quickly 
(twice per second) 
The OLT detects that the device is 
a rogue ONU. 
 
 
5 FAQs 
The LOS indicator is blinking. 
  When the LOS indicator blinks slowly, check whether the pigtail fiber is connected normally 
and whether the optical connector is contaminated.  
  When the LOS indicator blinks quickly, check whether the MA5672 transmits optical signals 
normally. 
The PON indicator is off.  
  Check whether the optical fiber is properly connected to the OPTICAL port.  
  The MA5672 fails to register with the OLT. Contact the service provider for help. 
  Press the RESET button by using a needle-type object.  
How can I restore factory defaults?  
  Press RESET button by using a needle-type object for longer than 10s to restore factory 
defaults and reset the MA5672. If the indicator is off and then is lit, the system restarts 
successfully.