Hi
You cannot use a random power injector, you must use the specified power injector mentioned on the data sheet.
These could be:
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/1550/power/guide/1550pwrinj.html
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/1550/installation/guide/1550hig/1550_ch1.html
2, PoE-In is not 802.3af; it does not work with a PoE 802.3af-capable Ethernet switch. It requires the dedicated Power Injector (AIR-PWRINJ1500-2=).
Regards
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