Thursday, August 20, 2020

Question about PoE budgets...

So when I'm picking switches for AV over IP, I'm always told by manufacturers to calculate max wattage for an encoder or decoder's PoE class for every power. I've never actually seen endpoints use close to the max, although i know they can when booting up potentially.

When a device is 802.3af (PoE), but the switch supports 802.3at Type 2 (PoE+), it seems to me that the power draw is less than the 15.4W allocation. Shouldn't the wattage range be different for 44-48V voltage vs 56V?

While calculating max-budget is best practice, sometimes shorting a little can save big dollars depending on the switch model, and whether you need RPS, etc.



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