We've been trying to set up a network of WiFi access points at our organization.
The current set-up is as follows:
3 access points connected to a network controller via a switch. The APs have radios enabled for 2.4GHz and 5GHz frequencies.
The access points are HP 525-WW devices. The controller is an HP 850.
Now, whenever we connect another AP to the switch, with an enabled and configured radio, the whole network dies, including both WiFi and wired connections to the controller.
The access points all reboot, start initialising, then flash the LED indicating an error with the radio, and after a few seconds start initialising again, then indicate radio error, etc.
When the new AP is disconnected, everything goes back to normal after a few seconds.
I'm not a network engineer, just a system administrator, so I'm not overly familiar with network engineering. We've been trying to resolve this issue for days, but have been unable to.
I can provide any extra information if needed.
Edit 1: On further testing, adding a new AP works when connected directly to a switch, but fails as described when connected via a PoE adapter.
Edit 2: Device models - Switch: HP-2530-8G-PoEP; Adapter: Powerdsine 3001G