A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?
A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?
A dual-band 802.11ac AP powered by PoE, classified as a class 4 device, should receive 25.5 W. According to the IEEE 802.3at (Type 2) standard, class 4 devices require 25.5 W for proper operation.
Answer is B 802.11ac APs is to provide power using 802.3at (sometimes called “PoE plus”), a newer power standard that provides up to 25.5 watts at the end of a full-length Ethernet cable
If 25.5 is the right answer, that would be C, not B. Class 4 PD is 25.5 Watts.
C - 25.5 W Class 4 can only be used by IEEE 802.3at (Type 2) devices, requiring valid Class 2 and Mark 2 currents for the power up stages. An 802.3af device presenting a class 4 current is considered non-compliant and, instead, will be treated as a Class 0 device. https://www.flukenetworks.com/blog/cabling-chronicles/type-3-and-type-4-are-here
https://en.wikipedia.org/wiki/Power_over_Ethernet#Powering_devices WHen it says Recieved PD (Powered Device) is assimed. the table in the Wiki calls this initial Wattage out. 30W is negotiated MAX (one would think).