"Can you give me specifications for the correct alternate power supply needed if I don’t have a Switch?"
The most cost-effective option would be to use our Power Injector (011124), plugging one end into the network source (non-PoE hub) and one end into the device.
--- EDIT 9/19/2025 ----
CyberData has received reports from customers that the Cisco 'Cube' power supply has updated the size of the barrel connector. This has rendered the power supply as incompatible with both the SIP Paging Server (011146) and SIP Paging Adapter (011233). CyberData recommends using a PoE injector to supply power. CyberData recommends a stand PoE injector rated to 802.3af, 15.4w. CyberData's PoE Injector (011124) is an option but there are a multitude of other options available.