I asked a similar question a few weeks ago:
http://community.cambiumnetworks.com/t5/PMP-450/PMP-450M-Event-Log-entries/m-p/63577#M3842
I asked a similar question a few weeks ago:
http://community.cambiumnetworks.com/t5/PMP-450/PMP-450M-Event-Log-entries/m-p/63577#M3842