@daubstep can you try connecting to 2.5GHz band channel?

Hi @ghost124, Few things could be the issue. - The SG3452P can only use SFP modules so you can't use SFP+ modules like the SM5110SR. - You I don't think SM and LR are compatible. Two SM311LR should...

Hi @daubstep, Try assigning a static IP. If that works then probably a DHCP issue.

Hi @WhiteLion58, It sounds like a network and/or DHCP issue. Here's some basic troubleshooting steps you can try... Verify EAP is physically connected to the new router Verify EAP is pingable from...

Hi @lockoom, I've not had any issues with SFP modules in SFP+ ports (other models), but be sure to manually set the port speed to 1GB on the SFP+ side. If you're connecting to another switch's SFP...

Hi @TarekCoupe, Yes: https://static.tp-link.com/upload/image-line/TL-SM5220-1M_UN_1.0_05_normal_20220421011646e.jpg