"A midspan (PoE injector) can provide the necessary power level for PoE+ (Class 4) devices when the existing switch only supports standard PoE (Class 3). The midspan is placed between the switch and the device."
— Axis PoE Solutions Overview
"A midspan is recommended when extra power is needed but the switch does not support the higher class."
— Axis Communications Academy, Network Video Fundamentals, 2022
[References:, , Axis Power over Ethernet Guide, , Axis Communications Academy, Network Video Fundamentals, 2022 (p. 78), ]
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