Ok, I guess here is the answer... https://community.tp-link.com/en/business/forum/topic/2319 Does MC220L version 4 supports other speeds than 1000Base-T?

@Anderson Anderson wrote Hi erichbonvicini If you use the MC220L V1~3, please make sure that your cable and equipment both support 1000M. So if I have MC220L (ver3) and I will connect 1000Base-T...