Problem with api router versus end device


I am working with 4 xbee serie 2 in API :
1 coordinator API
2 end device API
1 router API

When i start all of them the 2 end device are strating in 30s and rssi led are ligting and they are working perfectly.

The router have a rssi led that is not always
ligting why there is a difference with end device ?

When the rssi led is not lighting the communication is not ok. After a few moment the led is ligting and communication is ok while i transmit frame. When transmit frame is stopped then rssi led turn off and communication is stop !

Thank’s for help


The RSSI line only indicates when you have received valid data for that module. So I am not sure I understand what it is you are saying.