While testing my setup, it often disturbed me that the Xbee Pro doesn't have a led somewhere to show it's powered up.
Since I mount it onto a ply through an Xbee breakout board
like the one on the picture, I just soldered a small red led between the VCC and GND. Now I know when it's powered ok without having to setup all Xbee transmission line.
Of course, the led doesn't tell me if the Xbee is transmitting/receiving.