LAN RX/TX Throughput by AP

Good Day
I can’t fint the OID of LAN RX/TX Throughput by AP in the MIB file (2.1 Firmware)
Where can i find it?
Thanks

http://www.cambiumnetworks.com/support/pmp/online-tools

Click on ePMP 1000 and you can find the OID by searching for "EthRXBytes"

I am using Cacti but I have not been able to graph anything…