Hi everyone, I have find this on the mikrotik log.

I have a CCR1009 (router 1) and on the eth1 I have connected a master cambium PTP820 with 1Gb link and the port is always UP.
On the other side I have a CCR1009 (router 2) and on the eth1 I have the PTP820 slave with 1Gb link and the port is always UP.
On the router 1 I have found a lot of FCS error, but the cable and the plug is good.. any suggestions?

All the router have RouterOS 7.13.2

Thanks for your help

Is there any "LACP" config on the MikroTik side? Use this parameter, if there is:
viewtopic.php?p=1047773#p1047773

Is there any "LACP" config on the MikroTik side? Use this parameter, if there is:
viewtopic.php?p=1047773#p1047773

There'isnt any LACP

We had some Ubiquiti wireless equipment that threw the same FCS error, we upgraded/downgraded firmware on the Ubiquiti side to fix it.

I suggest you do the same, reflash latest official firmware on the cambium or downgrade.