There are posts here > https://community.cisco.com/t5/switching/ap-1562i-on-2960x-poe-switch/td-p/3053393
...that you might want to read up on first.
They may help.
If I'm recalling this discussion... it was on using the old PoE injectors on newe...
Not really as this is down to the protocol used and understood by the injector itself.
This is why one will get 15.4W off the older cisco injectors as it's the default power requirement should the injector and the device not utilize the same protocol...
It's the design of the pre-1560//1570//x800 series Access Point power injectors that's the issue plus how the newer APs accept power now.
Before = CDP + even more restrictive coding with the PoE injector company they partnered with...
With the x800...
Figured things out...
The 1560 and even the 2800/3800 APs do not communicate properly using the AIR-PWRINJ1500 when requesting power. The injector will only supply 15.4W to these Access Points which is definitely not enough to turn on the radios and ...