Powering a 2amp micro-usb device over cat5
Use a real/ active poe injector. At 30 ft, or 60ft round trip at 22 awg or smaller, and 2 Amps, you cannot use a passive injector or usb to Ethernet adapter without significant voltage drop at the other end. An active injector will give true Poe power, and a Poe to 5V 2 Amp switching adapter at the device end would give you what the device needs.