Thursday, November 15, 2018

How much power for VoIP phones?

One of our business units is getting ready to deploy a VoIP phone system, and they want to buy new switches to power the phones. I'm trying to figure out which switches to buy, but the vendor (Panasonic) can't tell me how much power their phones draw.

The phones that are going to be deployed are Panasonic KX-NT511P and KX-NT543.

The quick start guide states that they "comply with the PoE class II standard". If I interpret the PoE wiki correctly, that means they draw less than 7 Watts.

Does this sound correct? How does one typically calculate PoE requirements for a PoE phone deployment?



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