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This guide goes over how to upgrade an an existing switch that only support 802.3af (15W) to support 802.3at (30W) devices.
The example below shows a 24 port switch with a 500W power supply but this can be fine tuned to match your exact need.
Most Rack-Mounted PoE injectors only come with a small 120W power supply, example:
These can be upgraded with a quality 48V power supply. Some example below based on the power needed: