we are using VVX 500 Phones at Cisco 3850 Switches and the switch then are reservate 15.4 watt at the port. That are normaly to many, because the Phone only need max. 5.0 Watt.
If i configure a fixed Power from 7 Watt to the Switchport, the Phone is not working(Starting).
Is there any explanation why it doesn't work at 7 watts?
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as you can see from following document, VVX500 and VVX600 advertise as Class 4, on conformance with IEEE802.at. Therefore I think, maximum power Range used by the phone is 12,95–25,50 W.