Thank you for contacting Lennar Home Community.
Hope you are doing well!!!
Thank you for the detailed information you shared.
As per the case description, I could understand that you are unable to connect to your RUCKUS Access Points after connecting a new Router or Modem/Router combo device to the ICX-7150-C12P Switch.
As I see from the picture you shared, seems like the ethernet cable which is coming from the Router or Modem/Router combo is plugged into the wrong port on the Switch panel. It must be plugged into any 1 in-12 ports as shown in the below screenshot. Please unplug the ethernet cable and plug it into the correct port and try again.
Please refer to the short guide link below about how to connect the devices as reference:
Most common Setups for Lennar homes users:
Please let me know if you have any queries in this regard.
Thank you again for your patience.
Lennar Home Community.