Please check with the End User what’s their setting for the application and choose the correct PoE injector
A. Standard PoE in (using ACW-107 or other 802.3at injector) can provide ~15W Power range PSE to the APO-FLX IP55
B. 56V 2.1A power supply (ACW-109) with Passive PoE injector can provide standard 802.3at Power range PSE
In other words, ACW-109 is not required. But if the End User is aiming for the first case, then they would need to buy ACW-107 (802.3af/at PoE Injector).