Great idea!
I requested the same here: http://community.cambiumnetworks.com/t5/Your-Ideas/Ethernet-disconnections/idi-p/50300
It's very usefull to have a log... We had some issue with a client having ethernet disconnections, and it's impossible to log it. The only way is SNMP periodic pull but, honestly, it's much more simple for Cambium to add this feature :-D